Jayanta Das

Jayanta Das
Indian Institute of Technology Kharagpur | IIT KGP · Department of Metallurgical and Materials Engineering

Ph.D. (TU Dresden, Germany)

About

165
Publications
21,381
Reads
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5,900
Citations
Additional affiliations
June 2021 - present
Indian Institute of Technology Kharagpur
Position
  • Professor
Description
  • Teaching Research Administration
March 2016 - June 2021
Indian Institute of Technology Kharagpur
Position
  • Professor (Associate)
April 2012 - March 2016
Indian Institute of Technology Kharagpur
Position
  • Professor (Assistant)
Education
June 2004 - February 2008
Technische Universität Dresden
Field of study
  • Mechanical Engineering (Materials Science)
May 2001 - April 2003
Indian Institute of Technology Kharagpur
Field of study
  • Metallurgical Engineering
June 1997 - May 2001

Publications

Publications (165)
Article
We report the presence of austenite and its magnetostructural transition to martensite resulting in a large magnetocaloric effect in Ti doped Ni-Co-Mn-Sn textured ribbons. The evolution of the microstructure, micro-texture and the dynamics of the magnetostructural transition were studied for the as-spun and annealed Ni41.5Ti0.5Co9Mn39Sn10 ribbons....
Article
We report the effect of testing conditions on the nanomechanical behavior of the surface and inner core of as-cast plates of Zr41.2Ti13.8Cu12.5Ni10Be22.5, Zr52.5Cu18Ni14.5Al10Ti5, Zr58.5Cu15.6Ni12.8Al10.3Nb2.8 and Zr55Cu30Ni5Al10 bulk metallic glasses (BMGs). A series of instrumented nanoindentation experiments have been performed under control loa...
Article
Vitreous alloys exhibit changes in the specific heat capacity (Δcp) as well as configuration at the characteristic glass transition temperature (Tg). A wide variety of bulk metallic glasses (BMGs) such as, Zr47.5Cu47.5Al5, Zr55Cu30Ni5Al10, Zr52.5Cu17.9Ni14.6Al10Ti5 and Zr41.2Ti13.8Cu12.5Ni10Be22.5 were rolled at room temperature, and the variation...
Article
We report the evolution of nanocrystalline α-Fe and γ-Ni phases in (NixFe1-x)70.5B17.7Si7.8Ti4 (at.%) where, x = 0.3 and 0.4, upon mechanical alloying of elemental powder mixtures up to 36 h. The effect of milling time on the nanostructure evolution, thermal stability, and magnetic properties have been investigated throughly using x-ray diffraction...
Article
Full-text available
The effect of cold rolling on the evolution of hardness (H) and Young’s modulus (E) on the rolling-width (RW), normal-rolling (NR), and normal-width (NW) planes in Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vitreloy 1) bulk metallic glass (BMG) was investigated systematically using nanoindentation at peak loads in the range of 50 mN–500 mN. The hardness at spec...
Article
We report an artificial neural network (ANN) based tool to predict the evolution of phase(s) in high entropy alloys (HEAs) and their Young’s modulus. Two independent networks as single channel output and four channel binary output methods have been adopted for testing as well as for predicting the evolution of either single-phase BCC, FCC solid sol...
Article
We report nano-precipitation induced hardening in Ni88.32Zr7.68Al4 ultrafine lamellar eutectic composites (UECs) and enhancement of yield strength from 1010 MPa to 1191 MPa upon annealing upto 120 min at 800 oC. The as-solidified microstructure of (Ni0.92Zr0.08)100-xAlx (x = 0 and 4 at.%) consists of micrometer sized γ-Ni dendrites homogeneously di...
Article
NiO nanospheres and NiO nanospheres deposited on rGO nanosheets i.e., rGO-NiO nanocomposites have been synthesized using in-situ solvothermal method. The crystal structures, phases, and morphologies of the synthesized samples have been confirmed by XRD, Raman, and TEM measurements. The detailed information regarding chemical bonding, identification...
Article
Here, carbon nanotubes (CNTs), carbon nanochains (CNCs) and carbon quantum dots (CQDs) were synthesized using charcoal powder in a mixture of concentrated H2SO4/HNO3 acidic solvent with the help of NaOH. It is demonstrated that the lower alkaline or basic environment is favourable to enhance the effectiveness for the formation of CNTs and CNCs wher...
Article
Strain rate sensitivity and deformation mechanism of nano-lamellar γ-Ni/Ni5Zr eutectic at room temperature - Anushree Dutta, Jayanta Das
Article
The oxidation behavior of (Ni0.92Zr0.08)100-xAlx (0 ≤ x ≤ 4 at%) ultrafine eutectic (γ-Ni + Ni5Zr) composites (UECs) with average lamellae thickness (λw) in the range of 150–275 nm and the constituent individual phases, have been investigated systematically in the temperature range of 500–900 °C up to 120 h of exposure. The specific mass gain (Δw)...
Article
Full-text available
Arc-melted multiphase intermetallic alloys, Mo76Si14B10, Mo74Si14B10Zr2, Mo79.5Si12B8.5 and Mo77.5Si12B8.5Zr2 with microstructures containing Moss, Mo3Si and Mo5SiB2 were isothermally exposed for 1 h or 24 h at 1000 °C, 1150 °C and 1300 °C in dry or moist air. The residual area fraction was found to be the highest on exposure at 1150 °C in dry air,...
Article
Eutectic alloys with two alternating phases in the microstructure are well known for their excellent mechanical properties as well as superior castability. In this review, we have surveyed a large number of eutectic/near-eutectic alloys, their recent advancement mostly in Al-, Ni-, Ti-, Fe-base binary, ternary, multicomponent, and high entropy allo...
Article
Full-text available
The variation of casting thickness and solute content may play a significant role to alter the microstructure, thus, mechanical, creep and other properties. Therefore, the present work aims on the microstructural modification in terms of the length scale of the constituent phases and microstructure homogeneity in differently cast rods (Ø=2 mm, 3mm,...
Article
Full-text available
We report the synthesis and characterization of a multifunctional composite obtained by integrating micron-sized Ni52Mn26Ga22 Heusler alloy particles into a polysulfone matrix. The Heusler alloy powders were synthesized by the ball milling of as-spun Ni52Mn26Ga22 ribbons and subsequently incorporated into a polysulfone matrix using the solution cas...
Article
The effect of moist environment on the isothermal oxidation behavior of Mo76-xSi14B10Fex (x = 0, 0.5, 1 at.%) ultrafine composites containing proeutectic α–Mo solid solution phase and eutectic mixture of Mo3Si (A15) and Mo5SiB2 (T2) phases, have been investigated at temperatures in the range of 700–800 °C. The mass loss has been greatly improved by...
Article
We report the tuning of the glass transition temperature (Tg) in Zr55Cu30Ni5Al10 metallic glass by rolling at room temperature. The precise thermo-analytical measurements using step-scan modulated temperature differential scanning calorimeter (MTDSC) revealed a decrease of Tg by 16.9K in ribbons and 7.1K in bulk glassy plates upon 40% and 70% thick...
Article
In the present study, we compare a La‐Fe‐Si‐based alloy doped with Mn, LaFe11.7Si1.2Mn0.1, cast by three different techniques leading to different microstructures. Arc‐melting, suction casting, and melt spinning are used to fabricate LaFe11.7Si1.2Mn0.1 samples to analyze the influence of as‐cast microstructure and distribution of phases on annealin...
Article
The onset of the glass transition (Tgonset) and crystallization (Tx) temperatures of Cu47.5Zr47.5Al5 and Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vitreloy 1) plates were investigated using conventional differential scanning calorimeter (DSC) and step-scan modulated differential scanning calorimeter (MDSC). A large scatter of the Tgonset values with error of ±...
Article
The effect of Fe addition and the moist environment on the high temperature isothermal oxidation behaviors of multiphase Mo 76-x Si 14 B 10 Fe x (x = 0, 0.5, 1 at.%)composites in the range of 1000–1300 °C have been investigated. The microstructure of all the composites with α–Mo solid solution (SS)and eutectic mixture of Mo 3 Si + Mo 5 SiB 2 phases...
Article
Full-text available
To overcome the limited mechanical properties of single-phase FCC/BCC high entropy alloys, a large effort is being made towards the development of eutectic composites. The eutectic/near eutectic high entropy alloys (EHEAs) with alternate lamellar phases provide an optimum balance between strength and ductility. Therefore, CoCrFeNiNbx (0.45 < x < 0....
Article
We report a correlation between the Curie temperature (TC) and lattice parameter (a) of γ-Ni phase in Fe-Ni-base alloys. The Bethe-Slater curve represents the dependence of exchange integral (J) on the ratio of the interatomic spacing (D) to the diameter of 3d orbital (d) of an element. According to the mean field model, the exchange integral J is...
Article
The control over the water pollution caused by the organic and biological pollutants is one of the challenging tasks for the scientific community. Here, we have focused to develop materials which can be used to remove both types of water pollutants and also assist in solving problems related to the energy crisis. The CuO, Cu2O, rGO-CuO and rGO-Cu2O...
Article
The effect of cooling rate on the microstructure evolution and the mechanical properties of ingots and rods of 2-5 mm diameter of (Ni 0.92 Zr 0.08 ) 100-x Al x (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites have been investigated. The microstructure of the composites is comprised of micrometer size 3-Ni dendrites embedded in a nano/-ultrafine lamel...
Article
Full-text available
The effect of 2 at. pct Zr addition at the expense of Mo on microstructural evolution, hardness as well as non-isothermal and isothermal oxidation behavior of arc-melted or spark-plasma sintered (SPS) 76Mo14Si10B and 79.5Mo12Si8.5B alloys, has been examined. The microstructures of both arc-melted and SPS alloys have exhibited α-Mo, Mo3Si and Mo5SiB...
Article
The glass transition temperature (Tg onset) and super-cooled liquid region (ΔTx) of Zr55Cu30Ni5Al10 metallic glass ribbon and bulk glassy plate have been measured using conventional and step-scan modulated temperature differential scanning calorimeter (MTDSC). A wide variation of Tg onset(±14.8 K) and ΔTx (±18.5 K) have been estimated using convent...
Article
We report the evolution of nanocrystalline γ-Ni of 3–7 nm size along with amorphous phase in (Ni0.50Fe0.50)70.5B17.7Si7.8Ti4 (at.%) upon mechanical alloying of the elemental powder mixture up to 36 h. The effect of milling time on the nanostructure, thermal stability and magnetic properties, have been investigated using x-ray diffraction, different...
Article
The development of single-phase high-entropy alloys (HEAs) emerges as a new paradigm shift in material research society during the last decade. A strong rise in the demand for structural and functional applications leads to the design and fabrication of super-strong eutectic HEAs through solidification processing. We report on the evolution of eute...
Conference Paper
Magnetocaloric La (Fe, Si)13 intermetallic powder is dry coated with ductile metallic copper. The dry coating is attempted by two different processes using a high energy impact coater “Nara Hybridization System (NHS)” and Fritsch P7 Planetary Ball Mill. LaFe11.6Si1.4 was used as core particle and metallic copper as the coating. SEM and EDX images s...
Article
Full-text available
The present study demonstrates the evolution of eutectic microstructure in arc-melted (Zr0.76Fe0.24)100-xNbx (0 ≤ x ≤ 10 at.%) composites containing α-Zr//FeZr2 nano-lamellae phases along with pro-eutectic Zr-rich intermetallic phase. The effects of Nb addition on the microstructural evolution, mechanical properties under compression, bulk hardness...
Article
Full-text available
sually, cold working strengthen metals and alloys by introducing large population of dislocations, whereas annealing of cold worked metal recovers the structure, annihilates dislocations, forms new strain-free grains, and results loss of strength. Here, we report annealing-hardening at temperature well below stress relieving and recrystallization t...
Article
Full-text available
The effect of Nb addition in arc-melted CoCrFeNiNbx (0.45 ≤ x ≤ 0.65) high entropy alloys (HEAs) on the phase evolution, stability, refinement of the microstructure, and mechanical properties are investigated. Minor fluctuation of Nb modifies the microstructure from hypoeutectic (x = 0.45) to eutectic (x = 0.5) and hypereutectic (x = 0.55) containi...
Article
Addition of Fe re nes the microstructure of Mo7 6-xSi1 4B1 0Fex (x = 0, 0.5, 1 at.%) composites containing α-Mo, Mo3 Si and Mo5 SiB2 phases, increases the hardness from 950 Hv (x = 0) to 1031 Hv (x = 1), and improves the oxidation resistance at temperature in the range of 800–1300 °C. The hardness of the base alloy substrate de- creases only by <7%...
Article
Full-text available
Cadmium oxide (CdO) nanorods (NRs) were synthesized by a facile co-precipitation method with potential for large scale production. The structural and optical properties of synthesized CdO NRs were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis...
Article
Full-text available
The precise control of dimension and mono-dispersibility of graphene quantum dots (GQDs) is still a challenge and new developments in this field are of great interest for scientific community. In this work, we have investigated the feasibility of the production of mono-dispersed spherical GQDs (∼ 4 nm) based on a treatment solely with ammonia solut...
Article
The effective fabrication of materials using selective laser melting depends on the process parameters. Here, we analyse the suitability of the energy density to represent the energy transferred to the powder bed, which is effectively used to melt the particles and to produce the bulk specimens. By properly varying laser power and speed in order to...
Article
The present study demonstrate the effect of stacking fault energy (SFE) on the evolution of crystallite size, dislocation density, twin density, stacking faults, and their mutual interactions during cryorolling in pure copper (SFE 78 mJ/m2) and copper–zinc alloys with varying Zn content of 10 wt. % (SFE 35 mJ/m2), 20 wt. % (SFE 19 mJ/m2), and 30 wt...
Article
Full-text available
Nanostructured alloys exhibit high strength and large elastic strain limit. Unfortunately, the plasticity of these alloys is disappointingly low at room temperature than that of the coarse grain counterparts. In this work, a series of nanoeutectic composites have been developed in Ti–Fe and Ni–Zr based alloys, which exhibit very high strength, like...
Article
We report the microscopic mechanism of lamellae deformation in a series of (Ti0.705Fe0.295)100−xSnx (0 ⩽ x ⩽ 4) eutectic comprising of ultrafine FeTi and β-Ti phases with varying lamellae thickness. Furthermore, the microstructural refinement and phase rearrangement upon severe forging have been explored using X-ray diffraction and transmission ele...
Article
Mullite has been produced by plasma spraying of aluminaezircon powder mixture. As sprayed coating shows good integrity. Laser remelting reduced porosity and increased coating hardness. a b s t r a c t A mechanical mixture of alumina and pulverized zircon sand in 3:2 M ratio has been plasma sprayed to obtain mullite coating. Thereafter, the top laye...
Article
Full-text available
Nanotwinned α-brass (Cu–30 wt.% Zn) with varying lamellae thickness in the range of 28–170 nm, has been produced by cryorolling (CR). The effect of CR strain (ɛCR = 0.2–0.95) on the evolution of homogeneity and refinement in terms of twin lamellae thickness, twin spacing, and their distribution, have been studied using high-resolution transmission...
Article
The effect of cryorolling (CR) strain at 153 K on the evolution of structural defects and their interaction in α−brass (Cu–30 wt.% Zn) during nanostructuring has been evaluated. Even though the lattice strain increases up to 2.1 × 10−3 at CR strain of 0.6 initially, but it remains constant upon further rolling. Whereas, the twin density (β) increas...
Article
Full-text available
The effect of Sn addition on the microstructure evolution in ultrafine lamellar (Ti 0.705 Fe 0.295) 100Àx Sn x (0 6 x 6 4 at.%) eutectic composites and size effect during Vickers microhardness measurements at load in the range of 0.049 N and 19.61 N have been studied. The hardness of all the lamellar composites with varying Sn content decreases wit...
Conference Paper
Severe plastic deformation (SPD) processes such as, high pressure torsion, equal channel angular pressing, accumulative roll banding, reciprocating extrusion compression, cyclic closed die forging, repetitive corrugation and straightening, and dynamic plastic deformation, have been widely used to synthesize bulk materials with nano-/ultrafine grain...
Article
Full-text available
Hot-pressed and arc-melted Mo76Si14B10 (at. pct) exhibits alpha-Mo solid solution, Mo3Si, and Mo5SiB2 in microstructures with varying morphologies. Cyclic oxidation tests performed at oxygen partial pressures of 0.21 and 1 atm show the mass loss of the hot-pressed alloy to be a parts per thousand 1.5 and a parts per thousand 4 times less, respectiv...
Article
The transient stage during isothermal oxidation of Mo76Si14B10 has been studied at 1150 °C. The maximum mass loss is found to occur by volatilization of MoO3 within the first 480 s of exposure, which is considered to be the transient period. Scanning electron microscopic studies have revealed that a glassy borosilicate layer flows to cover the top...
Article
The present work is aimed to develop homogeneous ultrafine eutectic composites without any micrometer size second phase dispersions. Ti70.5Fe29.5 is chosen as a model eutectic system and ingots were prepared by arc melting upon addition of different amount of Sn. The effect of Sn addition to Ti70.5Fe29.5 on the interlamellar spacing, microstructure...
Conference Paper
Oxidation behavior of hot pressed (HP) and arc melted (AMI) Mo76Si14B10 alloy has been studied at 1150 °C in different partial pressures of oxygen to explore the mechanism of protection against degradation. Microstructure of both the differently prepared alloy consists of Moss, Mo3Si and Mo5SiB2 phases with varying morphologies. The size of Moss ph...
Conference Paper
Oxidation behavior of hot pressed (HP) and arc melted (AMI) Mo76Si14B10 alloy has been studied at 1150 °C in different partial pressures of oxygen to explore the mechanism of protection against degradation. Microstructure of both the differently prepared alloy consists of Moss, Mo3Si and Mo5SiB2 phases with varying morphologies. The size of Moss ph...
Article
Full-text available
We investigated the effect of tungsten particle sizes on the thermal stability and reactivity of uniformly dispersed W particles in molten Hf-based alloy melt at elevated temperature (1673 K). The solubility of particles less than 100 nm in radius is significantly enhanced. In case of fine W particles with 20 nm diameter, their solubility increases...
Article
Full-text available
Transmission electron microscopic studies of eutectic Ti68.38Fe28.61Sn3 upon 5% and 10% plastic deformation reveal slip transfer across the β-Ti/FeTi lamellae interface. Stroh's analysis suggests that addition of Sn to Ti70.5Fe29.5 increases the cleavage stress and reduces the slip stress around a dislocation pile-up at β-Ti/FeTi interface. The pre...
Article
The effect of superficial CeO2 coating on the oxidation behavior of Ti–6Al–4V has been studied under isothermal and cyclic heating conditions in the temperature range of 923–1223 K in dry air. During the early periods of exposure, the oxide scale grows obeying near linear followed by near parabolic kinetics and consists of alternate layers of α-Al2...
Article
The microstructure of α-brass has been investigated at 98% and 200% of cryorolling (CR). Severe cryorolling introduces microscopic shear bands, forms primary and secondary twins, and the twin density increases with increase of plastic strain. Even though the average hardness values in CR200 (197 Hv) does not increase significantly than that of CR98...
Article
The mechanical behaviour upon compression of (Cu0.50Zr0.50)100−xAlx (x = 4, 5, 7) rods with 2 and 3 mm diameter was systematically studied and compared with the literature data. Fully amorphous bulk metallic glasses (x = 5, 7) show little permanent deformation and reproducible yield stress values. The remarkable fracture strain, observed for some a...
Article
Mo73.4Si11.2B8.1Al7.3Mo73.4Si11.2B8.1Al7.3 ultrafine eutectic–dendrite composites undergo severe oxidation at 1100 °C in dry air, being transformed completely into mullite and cristobalite. However, the net mass loss is reduced by at least ∼40%∼40% during 24 h exposure upon minor Ce addition to the alloy, indicating an unusual improvement in oxidat...
Article
A comparative study has been carried out to investigate the effects of Al and/or Ce additions on microstructure of Mo–Si–B alloys and their isothermal oxidation behaviour at 500 and 700 °C in laboratory air for 24 h. Microstructure of arc melted Mo–Si–B–(Al, Ce) alloys consists of bcc α-Mo dendrites embedded in ultrafine lamellar Mo3Si and Mo5SiB2...
Article
Mechanical prehistory is an important factor on the stability of the structure, and consideration of this issue is also useful for determining the mechanisms of post-deformation and fracture processes in bulk metallic glasses. We present investigations to reveal the effect of prestraining on the compressive deformation, morphology of the fracture s...
Article
Ultrafine structured Ti70.5Fe29.5 and Ti67.79Fe28.36Sn3.85 eutectic rods comprising of β-Ti and TiFe phases were prepared by copper mould casting. The corrosion and passivation behaviour were investigated in halide free aqueous media (pH 1–13) by means of potentiodynamic polarisation and potentiostatic current transient measurements. Both eutectic...
Article
High strength (Ti0.705Fe0.295)100-x Sn x (0 ≤ x ≤ 6) composites have been prepared through arc melting and cold crucible casting. The microstructure consists of two phase ultrafine eutectic comprised of FeTi and β-Ti phases. The effect of Sn addition to the Ti70.5Fe29.5 eutectic is assessed in terms of microstructure variations such as eutectic spa...
Article
The intrinsic plasticity of Zr44Ti11Cu9.8Ni10.2Be25 and Zr55Ti5Al10Cu20 Ni10 bulk metallic glasses (BMGs) are improved from 0.5% up to 15% plastic strain due to the introduction of microstructural inhomogeneities upon cold rolling at room temperature. This approach shows an easy way to overcome the intrinsic brittleness of the BMGs by modifying the...
Article
Full-text available
The term "metallic glass" usually refers to a metallic alloy rapidly quenched in order to "freeze" its structure from the liquid state. A metallic glass is a metastable alloy, which lacks the symmetry typical for crystalline materials and at room temperature shows an amorphous liquid-like structure. Bulk metallic glasses (BMGs) represent a class of...
Article
This article reviews the recent work on the synthesis of multiphase composites in titanium base alloys to develop high strength and light weight materials with metastable phases. The strategies for alloy development, processing methods, evolution of different phase in the microstructure, elastic-plastic behavior are discussed for Ti-Fe-base eutecti...
Article
The work hardening ability under room temperature compression of ductile Cu47.5Zr47.5Al5 and Cu47Ti 33Zr11Ni8Si1 bulk metallic glass-forming alloys has been studied and compared. Both alloys exhibit high fracture strength, distinct work hardening and large plastic strain. Systematic investigations on the microstructural evolution reveal the occurre...
Article
In the present work we prepared an in situ Cu <sub>47.5</sub> Zr <sub>47.5</sub> Al <sub>5</sub> bulk metallic glass matrix composite derived from the shape memory alloy CuZr. We use a strength model, which considers percolation and a three-microstructural-element body approach, to understand the effect of the crystalline phase on the yield stress...
Article
The effect of Al content on the glass formation and mechanical properties was studied for (Cu50Zr50)100−xAlx (x = 0, 4, 5, 7) bulk metallic glasses. The crystallization temperatures of fully amorphous Cu50Zr50, Cu48Zr48Al4, Cu47.5Zr47.5Al5 and Cu46.5Zr46.5Al7 as-cast rods are 724 K, 753 K, 758 K and 782 K, respectively. The mechanical properties we...
Article
The structural behaviour of Cu50Zr50 and Cu65Zr35 metallic glasses under uniaxial tensile stress was investigated in situ by high-energy X-ray synchrotron diffraction. The components of the elastic strain tensor were determined from both the change of positions of first maximum of the structure factor in reciprocal space as well as from the maxima...
Article
To circumvent the limited plasticity of bulk metallic glasses (BMGs), heterogeneous materials with glassy matrix and different type and length-scale of heterogeneities (micrometer-sized second phase particles or fibers, nanocrystals in a glassy matrix, phase separated regions, variations in short-range order by clustering) have been reported. We de...