Philipp Frint

• Dr.-Ing.
• Chemnitz University of Technology

Severe plastic deformation (SPD) processes offer the possibility of improving the mechanical properties of metallic materials by grain refinement. However, this great potential has so far mostly been applied on a laboratory scale or on small series. Equal-Channel Angular Pressing (ECAP) also enables to integrate the advantages in industrial process...

In this study, we investigate the effect of severe plastic deformation by equal-channel angular pressing (ECAP) on the ordering kinetics and the microstructural evolution in an 18-carat AuCuAg alloy. Differential scanning calorimetry (DSC) measurements clearly show that the ordering process is significantly influenced by a fine-grained microstructu...

In this study, investigations into the deformation behavior of aluminum AA5083 at elevated temperatures were carried out on a newly developed test rig. The test rig was developed jointly with ZwickRoell GmbH & Co. KG (Germany) and is based on a Nakajima test carried out with heated dies. In this way, statements can be made about the lightweight pot...

Cold extrusion is an unconventional approach that can potentially combine the benefits of plastic shaping of metals and simultaneous strengthening by grain refinement and strain hardening. In this study, cast billets of the commercially pure AA1080 aluminum alloy were extruded at room temperature in a conventional extrusion press with various extru...

In this study, equal-channel angular pressing (ECAP)Equal Channel Angular Pressing (ECAP) was used to improve the mechanical propertiesMechanical propertiesof Aluminum AA7075Aluminum AA7075 sheet metal. Various approaches were tested for ECAPEqual Channel Angular Pressing (ECAP) route C, involving either channel geometry, forming temperature, or po...

In this study, we investigate the effect of different microstructures generated by severe plastic deformation on the thermal stability of an age-hardenable Al-Mg-Si alloy (AA6082). To analyze recovery and recrystallization we investigate the internal friction at various excitation frequencies and the microstructural evolution of the material in a w...

Herein, the strain‐rate sensitive deformation behavior of a sintered Al‐ and Mo‐modified CrFeCoNi high‐entropy alloy (HEA) is focused. The sintered microstructure is investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), energy‐dispersive X‐ray spectroscopy (EDS), and X‐ray diffraction. It was found that aft...

Equal-channel angular pressing (ECAP) is an established method for the improvement of mechanical properties by grain refinement through shear strains. While there is a profound knowledge about ECAP of bulk materials, there is only a little information on the effect of ECAP on sheet metals. Therefore, a tool was developed that is able to perform ECA...

A new approach for equal‐channel angular pressing (ECAP) of thin AA5083 sheets using two different orientations is investigated to address the issues of sheet metal ECAP. The method includes the deformation of a stack of 6 individual sheets supported by bulk material pieces placed on both sides of the stack. An excess length of the support material...

Single-phase, face-centered cubic (FCC) high-entropy alloys (HEA) are promising materials for future applications. In order to improve the mechanical properties, especially the tensile strength of these materials, this study focuses on the combination of spark plasma sintering (SPS) and equal-channel angular pressing (ECAP). The initial fine-graine...

Equal-channel angular pressing (ECAP) allows to rapidly accumulate massive amounts of plastic strain and thus to promote grain refinement in metals, which is one of the main goals of severe plastic deformation methods. While early models have simplified the deformation during ECAP as simple shear, experimental observations and numerical simulations...

Achieving superplasticity requires a homogeneous, fine-grained microstructure with (primarily) globular grains. Equal-Channel Angular Pressing (ECAP) is an established method that produces considerable grain refinement. While there is substantial knowledge about work hardening and grain refinement during ECAP of bulk materials, there is only little...

This paper addresses localized plastic flow during equal-channel angular pressing (ECAP) of an AA6060 aluminum alloy. We observe an alternating formation of shear bands and matrix bands during ECAP that leads to pronounced strain partitioning without cracking. Local deformation is analyzed by considering the distortion of indents along flow lines i...

We investigate an extraordinarily high ductility in a low alloy carbon steel at an elevated temperature after a quenching and partitioning (Q&P) treatment. The conventional (quenched and tempered) reference material does not show similar behavior. Interestingly, the Q&P treated material’s ductility is considerably reduced at increasing strain rates...

We report on recurrent shear localization by formation of strictly alternating shear and matrix bands during equal-channel angular pressing (ECAP) of a 6000 series aluminum alloy. The strain partitioning process is documented by analyzing the deformation of a grid of indents as well as reconstructing the corresponding flow lines. Interestingly, she...

Equal-channel angular pressing (ECAP) is often used as effective tool for grain refinement for many different metallic materials. It is well known that grain size is an important microstructural feature influencing superplastic properties of fcc materials like aluminum alloys. The magnitude of introduced shear strain depends on geometrical paramete...

Quenching and partitioning (Q&P) treatments result in promising mechanical properties of advanced high-strength steels. However, recent studies indicate that Q&P steels are very susceptible to hydrogen embrittlement (HE). Using slow strain-rate tests, the effects of hydrogen charging in different media without and with recombination poison were inv...

In many metallic materials, load path changes result in Bauschinger effects, i.e., a reduction of yield strength. In this study, we present results of a microstructural investigation on Bauschinger effects in the sheet metal DC06 subjected to in-plane uniaxial loading. We performed tension-compression tests with different values of maximum tensile...

Among the advanced high-strength steels, quenching and partitioning (Q&P) steels provide excellent ultimate tensile strength in combination with good ductility. The mass fraction of martensite and austenite can be tailored by the Q&P treatment. In this study, the impact of the microstructure on the corrosion behaviour is investigated. For this, the...

This paper presents an innovative methodology for integrated technical-economic evaluations of extrusion technologies and aims to show potentials of severe plastic deformation (SPD) technologies. Extrusion technologies and processes such as SPD have a strong influence on properties of aluminium-based lightweight materials. Hence, research and devel...

Abstract: In this contribution, we study the microstructural evolution of an age hardenable AA6082 aluminum alloy during severe plastic deformation by gradation extrusion. A novel die design allowing an interruption of processing and nondestructive billet removal was developed. A systematic study on the microstructure gradient at different points o...

The Portevin–Le Châtelier (PLC) effect often results in serrated plastic flow during tensile testing of aluminum alloys. Its magnitude and characteristics are often sensitive to a material’s heat treatment condition and to the applied strain rate and deformation temperature. In this study, we analyze the plastic deformation behavior of an age-harde...

Equal-Channel Angular Pressing (ECAP) is a method used to introduce severe plastic deformation into a metallic billet without changing its geometry. In special cases, strain localization occurs and a pattern consisting of regions with high and low deformation (so-called shear and matrix bands) can emerge. This paper studies this phenomenon numerica...

Processing of AA6060 aluminum alloys for semi-products usually includes hot extrusion with subsequent artificial aging for several hours. Processing below the recrystallization temperature allows for an increased strength at a significantly reduced annealing time by combining strain hardening and precipitation hardening. In this study, we investiga...

Equal-Channel Angular Pressing (ECAP) is a method used to introduce severe plastic deformation into a metallic billet without changing its geometry. In special cases strain localization occurs and a pattern consisting of regions with high and low deformation (so-called shear and matrix bands) can emerge. This paper studies this phenomenon numerical...

Severe plastic deformation techniques can produce ultrafine-grained aluminum alloys with high strength and ductility, but further processing often requires costly and/ or time-consuming cutting or forming processes. In this study, we investigate the potential of an alternative processing route that operates below recrystallization temperature and t...

Recent work shows that severe plastic deformation processes such as ECAP or HPT considerably accelerate the precipitation kinetics of Al-Cu alloys. In this study, the authors analyze how a combination of mechanical load, aging time (and increased plastic strain), and aging temperature affects the precipitation kinetics of an AA2017 alloy after ECAP...

Compared to conventional extrusion processes, extrusion below recrystallization temperature leads to considerably accelerated precipitation kinetics (including a technologically attractive reduction of aging time)and higher hardness, which offers a high potential for the integration in industrial process chains. Due to the inhomogeneous straining d...

In most engineering applications, materials are subjected to complex load cases rather than the simple uniaxial ones typically used for material characterization. To experimentally study the material behavior under a combination of compression and shear, an inclined compression specimen can be used. This specimen has been applied in various earlier...

Severe plastic deformation methods are commonly used to increase the strength of materials by generating ultrafine-grained microstructures. The application of these methods to Al-Cu alloys is, however, difficult because of their poor formability at room temperature. An additional reduction of formability of such alloys occurs when ceramic particles...

Reducing friction plays a key role in the technological application of severe plastic deformation (SPD) techniques like equal-channel angular pressing (ECAP). In this paper, we report on an experimental study that investigates the suitability of various commercially available lubricants for SPD processing. We consider a custom-built friction test t...

This paper focuses on scaling of Equal-Channel Angular Pressing (ECAP) from conventional, laboratory scale (billet cross section 15x15 mm²) to large scale (50x50 mm²). We study pure copper billets produced by ECAP in two identical ECAP-dies (but with different cross-sections) that have been optimized to provide reduced contact friction. In order to...

The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a strain localized microstructure co...

Thixoforming is, due to the crossing of the semi-solid state, an alternative method of forming. A forming temperature above the solidus temperature, gives rise to structural components in an arrangement that would be impossible to achieve using other commonly used methods. In the specific area of thixoforming of steels, in comparison to non-ferrous...

The precipitation kinetics of Al-Cu alloys have recently been revisited in various studies, considering either the effect of severe plastic deformation (e.g., by equal-channel angular pressing – ECAP), or the effect of particle reinforcements. However, it is not clear how these effects interact when ECAP is performed on particle-reinforced alloys....

The equal-channel angular pressing (ECAP), as the most famous method of severe plastic deformation, has the potential for upscaling from the laboratory to industrial scale. Thus, it is important to examine the practice-relevant properties of large billets deformed by this process. Mechanical properties and corrosion resistance significantly affect...

In this study we investigate the influence of various magnitudes of backpressure (0 to 200 MPa) during large scale (cross-section 50×50 mm2) equal-channel angular pressing (ECAP). We focus on the homogeneity of the induced strain and, within this context, on the homogeneity of the resulting mechanical properties after one pass of ECAP at room tempe...

The microstructure of the aluminium alloy 6060 after industrial scale (cross-section 50Ã - 50 mm2) equal-channel angular pressing (ECAP) is studied. We focus on processing without additional backpressure in order to allow the formation of a corner gap and the corresponding development of a distinct strain gradient after one pass. Low voltage scanni...

Future applications of ultrafine-grained, high performance materials produced by equal-channel angular pressing (ECAP) will most likely require processing on an industrial scale. There is a need for detailed microstructural and mechanical characterisation of large-scale, ECAP-processed billets. In the present study, we examine the microstructure an...

In dieser Arbeit wird das Potenzial der ECAP-Umformung (engl. Equal-Channel Angular Pressing) für eine Skalierung vom Labor- zum industriellen Großmaßstab betrachtet. Im Fokus der Untersuchungen stehen dabei insbesondere die Erfassung und Quantifizierung von Skalierungseffekten auf die mechanischen Eigenschaften. Am Beispiel einer gut pressbaren Al...

The evolution of subsequent yield loci after large plastic strains has been studied for pure iron and steel with ferrite-pearlite structure. Large strains have been applied by torsion of thin walled tubes with different strain paths: monotonic and cyclic incremental torsion. Points on the yield loci have been probed by biaxial torsion-tension or to...

In the present study, the potential for up-scaling the equal channel angular pressing (ECAP) process from laboratory to an industrial scale is investigated. Special attention is placed on detecting and quantifying size effects on the mechanical properties of a 6000 series aluminium alloy (AA6060). ECAP is performed with two different cross sections...