Alex Montagne

• Polytechnic University of Hauts-de-France

Clay is commonly used to remove pollutants like heavy metals from water. It has excellent properties, such as high cation exchange capacity and a large specific surface area. Various techniques can be used to improve these materials, including organic modification using polymers, calcination, acid activation, and modification through surfactant ads...

Polylactide polymers (PLA) are widely used for coatings, semi-finished products, or finished components in various industrial applications. However, PLA polymers developed by 3D printing require functional performance related to the properties of their finished surfaces. Therefore, it is essential to master the 3D printing process for better perfor...

In recent years, fused deposition modeling (FDM) techniques have become essential for the future of additive manufacturing. One of the main challenges is to identify the optimal printing parameters that enhance the quality, productivity, and durability of the resulting structures. Although hardness is critical for mechanical strength and wear resis...

In recent years, fused deposition manufacturing (FDM) techniques have been seen as the processes of the future. One of the main challenges is to identify the optimal parameterization of the 3D printing process in terms of quality, productivity, and service durability of the resulting structures. Hardness is little studied in the literature dedicate...

Ti-Ni shape memory alloys (SMA) are used extensively in the field of orthopedics owing to their unique physical and mechanical features, excellent corrosion resistance, and good biocompatibility in the human body environment. This study aims to investigate how milling time affects the characteristics of Ti-Ni alloys which were synthesized with equa...

The organic–inorganic hybrid composite materials, polybithiophene and Cadmium Sulphide have been successfully synthesized by electrochemical method onto the ITO substrates. The obtained hybrids were characterized by techniques like Scanning electron microscope (SEM), UV–Vis photo spectrometer and X-ray diffraction (XRD) to examine the phase purity...

Titanium (Ti)-based alloys with only a b-phase have attracted academic and industrial interest for ortho-pedic application, due to their close properties to those of tissues. The current study aims to investigate the effect of milling time (2 h, 6 h, 12 h and 18 h) on the nanostructured ternary alloy Ti-25Nb-25Zr prepared by high energy milling, on...

Titanium (Ti)-based alloys with only a b-phase have attracted academic and industrial interest for ortho-pedic application, due to their close properties to those of tissues. The current study aims to investigate the effect of milling time (2 h, 6 h, 12 h and 18 h) on the nanostructured ternary alloy Ti-25Nb-25Zr prepared by high energy milling, on...

Titanium (Ti)-based alloys with only a b-phase have attracted academic and industrial interest for ortho-pedic application, due to their close properties to those of tissues. The current study aims to investigate the effect of milling time (2 h, 6 h, 12 h and 18 h) on the nanostructured ternary alloy Ti-25Nb-25Zr prepared by high energy milling, on...

Electroless nickel-boron coatings present outstanding properties such as high hardness, excellent wear resistance and uniform coating, and thus they are considered to be alternative to toxic hard chrome coatings. However, they contain lead that is toxic and used as stabilizer in the plating bath. This study aims to investigate the tribocorrosion be...

In this study, CrN/CrAlN multilayer coating with different periods (Ʌ = 1, 2, 3, 4) were deposited on stainless steel (90CrMoV8) and silicon Si (100) samples by DC magnetron sputtering. The results obtained exhibited that the increasing of the number of periods considerably improves the properties of multilayer coatings. All CrN/CrAlN multilayer co...

The development and qualification of CrAlN coatings deposited by DC magnetron sputtering offer new industrial solutions to increase the lifecycle of material forming tools (machining and shaping). This study focuses on the selection and optimization of deposition modes for CrAlN layers to be deposited on a 90CrMoV8 tool steel substrate. The adopted...

The influence of milling time on the tribological behavior of a Co–Cr–Mo alloy designed for biomedical applications, synthesized via mechanical alloying is investigated. Elemental Co, Cr and Mo powders are milled using different milling times (2, 6, 12 and 18 h) in a high-energy ball mill. The resulting powders were subjected to cold uniaxial and h...

This work presents a mechanical study by nanoindentation of Constantan thin films deposited by cathodic sputtering technique with an intermediate thin adhesion layer of titanium on a (100) silicon wafer substrate. A methodology based on a modified contact area function is proposed for a suitable processing of the nanoindentation data in order to ex...

To be printable, the cementitious ink may have contradictory properties. It must be fluid enough initially to be pumpable and extrudable, also should stiffen quickly after deposition to be buildable. This could be influential, along with other printing parameters, on its interlayer zone. Thus, the main purpose of this study is to compare experiment...

The formability of thin sheets governs the feasibility of plastic deformation and shaping processes. Consequently, the identification of the laws of behaviour and its damage mechanisms proved to be necessary to master and validate the operating modes of the processes of obtaining the finished stampings. This is established using the standardized Er...

This paper deals with a combined experimental/numerical approach to identify the degradation profile of the magnetic properties at the cutting edge of mechanically cut electrical steels. Using a dedicated magnetic measurement device combined with a specific magnetic characterization protocol and mechanical hardness measurements, the impacted distan...

Electroless nickel-boron coatings were deposited from a novel deposition bath that was stabilizer-free. Those coatings were analyzed by DSC to determine the crystallization temperature of nickel-boride phases, and then the best heat treatment conditions for the new coatings were selected using the Knoop hardness test and XRD. The results of DSC ana...

Degradations of implants during their service life lead to rejection because of corrosion and wear-related problems, i.e., toxic ions and wear particles released into the human body. In this case, tribocorrosion tests are appropriate ways to investigate the synergistic effect of the corrosion and wear phenomena, on the material implant in simulated...

The main objective of this paper is to compare the fracture toughness determined by instrumented indentation tests of a variety of self-compacting concretes (SCCs) and normal vibrated concretes (NVCs). For this purpose, five mixing compositions of self-compacting concrete (SCC) with different water/binder ratios of 0.33 to 0.41 (water/cement ratio...

The accuracy in the determination of the mechanical properties by instrumented indentation strongly depends on the indenter/material contact area, the corrective compliance, and the indenter tip defect. For the calibration, we suggest to combine 3 functions: (i) a Force-function, where only the corrective compliance term is the unknown parameter, (...

Hard chromium coatings are widely used due to their excellent mechanical properties. However, they are historically obtained from hexavalent chromium (Cr-VI) solutions, which are classified as Carcinogenic Mutagenic Reprotoxic (CMR) material due to their very high toxicity. NiW coating is studied in this work as a possible replacement for Cr-VI coa...

This paper proposes an identification methodology based on nanoindentation analysis of coating/substrate system to extract the elastic-plastic properties of coating materials on elastic-plastic substrate when the indenter penetration depth is greater than the film thickness. In order to accurately predict the elastic-plastic properties of the coati...

Multilayer thin coatings (∼ 3 µm in thickness) were deposited using reactive radio frequency magnetron sputtering on Ti-6Al-4V substrate for biomaterial applications. Films are a combination of hard zirconium nitride with pure tantalum, used to manage interfacial stress and to avoid crack growth. Alternating hard/ductile material is a biomimetic de...

The effect of nanoscale intragranular premature κ-carbide precipitates, having an ordered structure but without chemical partitioning, on the incipient plasticity behavior of austenite in Fe-Mn-Al-(Cr)-C low-density steels was investigated by nanoindentation. We found that the incipient plasticity was dominated by a heterogeneous dislocation nuclea...

Nanoindentation is a technique commonly used to measure the mechanical properties of thin films even at depths less than 1 μ m. In fact, the characterization is based on the study of the load/displacement curves resulting from the nanoindentation test. We aim to use the backtracking search optimization algorithm (BSA) to improve the extraction of P...

Instrumented indentation testing is widely used to determine the mechanical properties of materials. In particular, this technique makes it possible to study brittle materials for which cracks can be generated around the impression during the indentation test. Cracking can result in the formation of pop-ins on the curve load-segment which can be us...

Cr-V-C-N thin films were deposited on XC100 steel and Si(100) wafers by a radio frequency magnetron sputtering technique using chromium and vanadium targets in an Ar/N2/CH4 mixture atmosphere. The microstructure, mechanical and tribological properties of coatings were investigated as a function of carbon content. It has been found that the quaterna...

Conventional electroless nickel–boron deposits are produced using solutions that contain lead or thallium, which must be eliminated due to their toxicity. In this research, electroless nickel–boron deposits were produced in a stabilizer-free bath that does not include any toxic heavy metal. During processing, the plating rate increased from 10 to 1...

Electroless nickel–boron (ENB) coatings from borohydride-reduced baths have received wide acceptance thanks to their excellent hardness and superior wear resistance. Therefore, they have been considered as an alternative to hard chrome. However, the presence of a small amount of toxic heavy metals such as Pb or Tl in the plating bath restricts thei...

Replacement of toxic and expensive vanadium (V) in medical grade titanium alloys with cheaper and non-toxic elements such as iron (Fe) or niobium (Nb), is an important step forward in developing safer and less expensive biomaterials. Evaluating the effect of different process parameters such as the milling time on the properties of these newly deve...

The development of instrumented nanoindentation consists of non-destructive tests applied to miniature volumes of material (PMMA). The present research focuses on the factors explaining the variation in the trends of the mechanical properties studied. The evolution of Young's modulus (E) and contact hardness (H) with depth (h) and indentation force...

Ti-alloys are widely used in biomedical devices and components, due to their desirable properties, such as low modulus, biocompatibility and corrosion resistance. Microstructural modification is often performed in order to improve physical, mechanical and tribological properties. This study aims to examine the effect of Nb content on mechanical and...

CrN/CrAlN thin films were deposited by DC reactive magnetron sputtering. The influence of CrN/CrAlN bilayer thickness on the microstructure, mechanical, and tribological properties was studied. Crystallinity of the layers was characterized by x-ray diffraction. The microstructure of all coatings was observed by scanning electron microscopy. Results...

Surfactants are widely used in many chemical industries and as primary components of cleaning detergents due to their specific characteristics,which in turn results in high pollution of domestic and industrialwastewaters by such substances. In this study, the mechanistic pathways of the adsorption of cationic benzyl-dimethyl-dodecyl ammoniumbromide...

CrAlN films were synthesized by DC reactive magnetron sputtering. The influence of the aluminium content on the microstructure, hardness and the friction coefficient of the CrAlN films have been investigated. Results indicate that all CrAlN coatings present a columnar and dense structure. Also, CrAlN coatings present a better hardness than CrN coat...

In the present work, a Si/Zr based sol–gel (SG) coating was deposited on 316L stainless steel plates, previously treated by passivation (SSO) or electropolishing (SSEP) producing two different surface states. The SG coatings were compared for SSO and SSEP substrates in terms of morphology, topography and tribocorrosion response. The coating topogra...

A novel experimental approach is proposed for creating surface microdefects in-situ during SVET analysis. Hot-dip galvanized steel samples fixed in the SVET cell and exposed to 0.05 M NaCl were scratched using a Berkovich indenter. The progress of corrosion activity at defect locations was continuously inferred by SVET scan lines starting 10 s afte...

Implant-related follow up complications resulting from poor implant integration, delamination, chipping, mechanical instability, inflammation or graft-vs-host reaction may lead to low patient tolerance, prolonged care and sometimes leading to a second surgery. Hence, there is an urgent need for developing biomaterials which will help to overcome th...

In this study, an attempt is made to quantify the brittleness in semicrystalline ethylene-co-butyl acrylate copolymer samples reinforced by carbon black (CB) nanoparticles. A series of samples with different CB volume fractions are investigated at ambient conditions. Two approaches are used to quantify the brittleness parameter. On the one hand, we...

CrAlN films were synthesized by DC reactive magnetron sputtering. The influence of the aluminium content on the microstructure, hardness and the friction coefficient of the CrAlN films have been investigated. Results indicate that all CrAlN coatings present a columnar and dense structure. Also, CrAlN coatings present a better hardness than CrN coat...

This investigation addresses the effect provided by industrial surface finishes on the tribocorrosion properties of 316L stainless steel exposed to NaCl solution. Three distinct surface treatments were evaluated: passivation (SSO), electropolishing-passivation (SSEP) and micro-undulation (SSM mechano-chemical + electropolishing + passivation). For...

Indentation tests, intimately linked to hardness measurements, are some of the easiest tests to administer. They are performed by pressing the tip of known shape and recording the properties at the surface of a specimen. The ratio between the applied load and the size of the residual imprint gives the "hardness" of the material. Since the 1980s, in...

The wear behaviour of the TiNi alloy tested at different conditions (2 and 4 N as applied loads and 40, 50 an 60 wt % as nickel contents) was investigated. For this purpose, two main experimental techniques consisting of wear and indentation tests were used. Scanning electron microscopy (SEM) and laser source profilometry were employed to reveal th...

Ti–Ni powder compacts were prepared by Mechanical alloying (MA), followed by hot isostatic pressing (HIP). Afterwards, the samples were sintered at different temperatures (950, 1050, 1150 and 1250 °C). Microhardness, density, crystallite size as well as microstrain of the sintered samples were measured and analyzed. Wear characteristics in phosphat...

Hexavalent chromium pollution from industrial waste water is a serious problem as it can cause adverse effects on the environment. Several methods are used to reduce the harmful effects of this pollutant, especially physico-chemical methods, such as Adsorption technology. The present study Preparation of Cr (VI) solution) from industrial sources in...

The effect of sintering temperature (1073−1373 K) on the structural and tribological properties of nanostructured ball- milled β-type Ti−15Mo samples was investigated. The prepared samples were characterized using various apperatus such as X-ray diffractometer, scanning electron microscope (SEM) and ball-on-plate type oscillating tribometer. Wear t...

Low modulus β-type Ti-15Nb alloys were prepared by subjecting them to different sintering temperatures (800, 900, 1000 and 1100 °C) and their morphological and structural properties were evaluated. X-ray diffraction analysis was used for the morphological characterization which indicated that the mean pore and crystallite size continuously decrease...

Low modulus β-type Ti-15Nb alloys were prepared by subjecting them to different sintering temperatures (800, 900, 1000 and 1100 °C) and their morphological and structural properties were evaluated. X-ray diffraction analysis was used for the morphological characterization which indicated that the mean pore and crystallite size continuously decrease...

Determination of hardness profiles of Functionally Graded Materials could be currently performed by two principal methods. One method consists in the measurement of hardness on the cut cross-section of the sample, which is destructive, expensive and time consuming. Another method involves the measurement of hardness at the surface with increasing l...

The impact of different industrial surface treatments, such as electropolishing and micro-undulation, on the mechanical and corrosion properties of cold-rolled 316L stainless steel has been investigated. The nature of the passive layers created by the three surface finishes led not only to chemical differences as determined by XPS analysis, but als...

The resistance to separation of the concrete from its reinforcing steel with which it is in contact is called adhesion .This adhesion constitutes an important property for the use of reinforced concrete. That is why many techniques were developed with the aim of determining this property. Adhesion can be easily found out by standard pullout test ma...

The bio-tribocorrosion behavior of newly developed near β-types Ti-15Nb and Ti-15Mo alloys was investigated in Phosphate-Buffered Saline (PBS) under different loads. Open-Circuit Potential (OCP), friction coefficient, wear volume and wear rate were evaluated. The results revealed that Ti-15Nb alloy exhibited lower wear rate, lower friction coeffici...

The hydrophilic-hydrophobic surface area of alumina powder (Al2O3) oxidized at different temperatures was determined on the base of adsorption of water and butane vapor at 25°C. In the order to study the influence of thermal oxidation upon hydrophilic/hydrophobic character of the surface, samples of Al2O3 were characterized using granulometry, SEM...

Aiming to develop alloys with better properties for orthopedic applications, the focus of the present research was to evaluate the effect of Mo at.% content on structural, mechanical, and tribological properties of hot isostatically pressed Ti-xMo (x = 4, 8, 12, 15, and 20 at.%) alloys. The structural evolution, mechanical properties, and tribologi...

The aim of this study was to investigate the influence of thermo-cyclic treatments on the mechanical characteristics (Hardness and Resilience) of low-alloy 42CD4 steel. Thermocyclic treatment on 42CD4 steel was operated for four cycles at 850 °C for 30 min. After each cycle, the steel sample was cooled in different medium (open air and water) in or...

The basis of the virtual machine concept, which is commonly used in coordinate measuring machines, was implemented to determine more realistic uncertainties on the estimation of the elastic modulus obtained from nanoindentation tests. The methodology is based on a mathematical model applied to simulate the testing process and to evaluate the uncert...

In this paper, the mechanical properties, the creep and the tribological behaviours of three borided and non-borided steel materials were analysed. The alloy steel substrates were borided by a powderpack boriding process during 8 h at 950 °C. The creep process during the holding stage of nanoindentation test was analysed using various mathematical...

To ensure reinforced concrete bars applications in more severe loading conditions, the contact between the steel bar and concrete must be strongly adhesive. This adhesion constitutes an important property for the use of reinforced concrete. That is why many techniques were developed with the aim of determining this property. Adhesion can be easily...

Mechanical properties of heterogeneous systems based on carbon black (CB) filled semi‐crystalline ethylene butyl acrylate (EBA) copolymer nanocomposites are characterized using nano‐indentation technique. The size effect and CB content dependence on the deformation behavior at room temperature were investigated. The phenomenology for hardness respo...

Chromium nitrides were deposited by RF reactive magnetron sputtering from a Cr target on high carbon steel substrates XC100 (1.17 wt% carbon) in a N2 and Ar gas mixture. In order to investigate the formation of chromium nitrides, carbide and carbonitride compounds were subjected to vacuum annealing treatment for 1 h at various temperatures ranging...

Deux revêtements à base nickel obtenus par des bains réducteurs, l’un brut et l’autre ayant subi un traitement thermique sont étudiés. L’essai d’indentation a été mis en œuvre pour caractériser la dureté et le module de Young de ces dépôts. Les résultats montrent une bonne homogénéité des propriétés mécaniques dans l’épaisseur du revêtement, alors...

The effect of sintering temperature (1073−1373 K) on the structural and tribological properties of nanostructured ball-milled β-type Ti−15Mo samples was investigated. The prepared samples were characterized using various apperatus such as X-ray diffractometer, scanning electron microscope (SEM) and ball-on-plate type oscillating tribometer. Wear te...

Chromium nitrides were deposited by RF reactive magnetron sputtering from a Cr target on high carbon steel substrates XC100 (1.17 wt% carbon) in a N2 and Ar gas mixture. In order to investigate the formation of chromium nitrides, carbide and carbonitride compounds were subjected to vacuum annealing treatment for 1 h at various temperatures ranging...

The focus of the present research is to evaluate the friction and wear behavior of two biomaterials alloys for total hip prostheses use, SSAISI 316L and a+b type titaniumalloy (Ti-6Al-7Nb).A ball on-disk tribometer (TRIBOtester) was used for tribological tests under wet condition using physiological solution (Hank’s solution) according to the ASTM...

The focus of the present research is to evaluate the friction and wear behavior of two biomaterials alloys for total hip prostheses use, SS AISI 316L and α + β type titanium alloy (Ti-6Al-7Nb). A ball-on-disk tribometer (TRIBOtester) was used for tribological tests under wet condition using physiological solution (Hank’s solution) according to the...

The aim of this work is to investigate the tribological behaviour of a continuous hot dip galvanized steel. This paper presents a fundamental study of the characteristics of zinc coating in terms of morphology, surface roughness and tribological behavior according to process parameters typical of industrial processes continuous galvanization. The m...

The sticking of the concrete on metallic formworks during building construction generates many concrete wall defects. Several solutions have been proposed, among which surface lubrication and polymeric coatings are commonly applied. In this paper, the main functional signatures of a steel formwork skin and a polymeric coating were determined to und...

Galvanization-morphologie structurale--nanoindentation des couches galvanisées-comportement tribologique

In this study, structural evolution, sliding friction, and wear behavior of the nano‐sized alpha‐alumina (α‐Al2O3), synthesized by calcination of gibbsite (Al2(OH)6) at different temperatures (273‐1473 K) are reported using X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and ball‐on‐disk wear tes...

Coatings based on WC–12Co, with and without the reinforcement of carbon nanotubes (CNTs) have been deposited by means of the HVOF thermal spraying technique on a SAE 1020 steel substrate. The aim of the present study is to evaluate in detail the influence of the 36 h milling time on both feedstock powders, particularly on the mechanical properties...

Nowadays buildings construction is performed by pouring concrete into molds called formworks that are usually prefabricated metallic modules. Defects such as stripping may possibly form during the removal of the formwork if the interfacial bonding between the concrete and the formwork is high. Making use of a new pull-off tensile test designed in o...

Nanostructured Cr-Al-N thin film with different Al content (0 to 50 at.%) were deposited. The structural evolution and morphological changes were performed. The tribological performances were evaluated using a ball-on-disk type Oscillating tribometer. The tests were carried out under normal loads of 2, 10 and 20 N respectively. The results showed t...

In the present study, the effect of thermal treatment on the mechanical and structural properties of chromium carbide coatings with different thicknesses is evaluated. The coatings were deposited by cathodic magnetron sputtering on XC100 steel substrates. Samples were annealed in vacuum, at different temperatures ranging from 700 to 1000°C for 1 h,...

The interfacial indentation test is experimented for the first time in order to characterize the adhesion between the concrete and its steel reinforcement. This technique, developed to estimate the adhesion of thick coatings (thermal barrier, plasma torch deposits, etc.), is used here to create and propagate a crack along the concrete/reinforcement...

The present work has been conducted in order to assess the mechanical and tribological performance of a ZrN/Mo2N coating deposited onto a H13 steel by means of a closed field unbalanced magnetron-sputtering ion-plating process. The hardness and elastic modulus of the coated system have been determined employing nanoindentation techniques. Dry and w...

Nanostructured Cr-Zr-N thin film with different Zr content (0 to 48.8 at.%) were deposited using an RF magnetron sputtering technique. The structural evolution and morphological changes were performed. The tribological performances were evaluated using a ball-on-disk type Oscillating tribometer. The tests were carried out under normal loads of 2, 4...

A study of mechanical properties of mesoporous silicon (PS) is presented in this article. PS was prepared by electrochemical etching of a heavily doped P⁺⁺ silicon wafer in a hydrofluoric acid electrolyte. The mechanical properties of PS and oxidized PS obtained by thermal treatment, were characterized by the nanoindentation technique associated to...

The assessment of mechanical properties of materials by instrumented indentation tests have been widely performed in last years. The objective of this work was to develop a methodology to analyze the mechanical behavior of materials from the data obtained by a continuous multicycle indentation test at the microscale of loads to limit the problems a...

This study aims to examine the effect of replacing vanadium by niobium and iron on the tribological behavior of hot-isostatic-pressed titanium alloy (Ti–6Al–4V) biomaterial, using a ball-on-disk-type oscillating tribometer, under wet conditions using physiological solution in accordance with the ISO7148 standards. The tests were carried out under a...

Binary Cr-N, Zr-N and Cr-Zr-N films were synthesised using a R.F. reactive magnetron sputtering technique by co-sputtering Cr and Zr. The crystalline structure, morphology, mechanical and tribological properties of the films as a function of Zr content were characterised by X-ray diffraction, microanalysis X (WDS, EDS), X-ray photoelectron spectros...

The nature of friction of vegetal fiber and polymeric matrix in bio-composite materials is very important for many industrial applications. In order to design natural fiber composites for structural applications, the scientific understanding of tribo-mechanical phenomena inside the heterogeneous structure of natural fibers and also the overall hete...