Composite of medium entropy alloys synthesized using spark plasma sintering

Chawake, Niraj; Raman, Lavanya; Ramasamy, Parthiban; Ghosh, Pradipta; Spieckermann, Florian; Gammer, Christoph; Murty, B.S.; Kottada, Ravi Sankar; Eckert, Jürgen

doi:10.1016/j.scriptamat.2020.09.015

Cited by 19 publications

(3 citation statements)

References 52 publications

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“…Medium entropy alloys (MEAs) have been extensively studied in recent years as a new type of structural materials [1][2][3][4], due to their many promising properties: high strength/hardness, good wear resistance, good plasticity, high corrosion resistance, excellent high-temperature stability, outstanding electrical conductivity, thermal conductivity and magnetic properties [5][6][7][8][9][10]. It is shown that multiple principal elements have significant effects on stacking faults (SFs), deformation twins, and cross-slip shifts of dislocations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy

Zhang

Shi

2023

Modelling Simul. Mater. Sci. Eng.

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Nanoindentation analyses of (CoCr)100-xNix medium-entropy alloys with different Ni contents and crystal orientations were carried out by molecular dynamics simulation. Analyses show that the force-displacement curves during elastic deformation are in good accordance with the Hertz contact theory and the elastic modulus is closely related to the Ni contents and crystal orientations. The elastic-plastic transition point appears later in (CoCr)67Ni33 than in other alloys. The plastic deformation was studied by exploring the instantaneous microstructure, which was found to be dominated by homogeneous nucleation of Shockley partial dislocations and the accumulation of stacking faults, and different levels of dislocation density were produced in medium-entropy alloys with different Ni contents and crystal orientations. By analyzing the evolution of dislocation density and hardness, a linear relationship between the square root of dislocation density and hardness can be revealed, which agrees well with the classical Taylor hardening expression, and the empirical constant is found closely related to the crystal orientation.

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Section: Introductionmentioning

confidence: 99%

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy

Zhang

Shi

2023

Modelling Simul. Mater. Sci. Eng.

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“…The sintering methods for preparing zinc oxide ceramics include cold sintering [16][17][18], ultra-high temperature sintering [19], flash sintering [20], and spark plasma sintering [21,22]. Spark plasma sintering (SPS) is a rapid sintering technique, which is widely used to fabricate metals [23,24], metallic alloys [25,26], carbide [27], various MAX-phase materials [28], and metallic oxide (ZnO, AZO) [29,30], etc. Different from the conventional sintering method, SPS can fabricate ceramics in very short time under low voltage and high direct current condition.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO Ceramics with Defects by Spark Plasma Sintering Method and Investigations of Their Photoelectrochemical Properties

Zheng

Zhang

et al. 2021

Nanomaterials

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ZnO, as an important semiconductor material, has attracted much attention due to its excellent physical properties, which can be widely used in many fields. Notably, the defects concentration and type greatly affect the intrinsic properties of ZnO. Thus, controllable adjustment of ZnO defects is particularly important for studying its photoelectric properties. In this work, we fabricated ZnO ceramics (ZnO(C)) with different defects through spark plasma sintering (SPS) process by varying sintering temperature and using reduction environment. The experimental results indicate that the changes of color and light absorption in as-prepared ZnO originate from the different kinds of defects, i.e., oxygen vacancies (VO), interstitial zinc (Zni), and Zinc vacancies (VZn). Moreover, with the increase in calcination temperature, the concentration of oxygen defects and interstitial zinc defects in the ceramics increases gradually, and the conductivity of the ceramics is also improved. However, too many defects are harmful to the photoelectrochemical properties of the ceramics, and the appropriate oxygen defects can improve the utilization of visible light.

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“…These outcomes permit the significant grain growth inhibition and the retention of fine microstructure from raw powders [ 5 ]. The high densification of refractory materials [ 6 ], composite materials [ 7 ] and other novel functional materials [ 8 ] can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Proportional Integral Derivative Control in Spark Plasma Sintering Simulations

et al. 2021

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The prediction of microstructure evolution and densification behavior during the spark plasma sintering (SPS) process largely depends on accurate temperature regulation. A loop feedback control algorithm called proportional integral derivative (PID) control is a practical simulation tool, but its coefficients are often determined by an inefficient “trial and error” method. This paper is devoted to proposing a numerical method based on the principles of variable coefficients to construct an optimal linear PID controller in SPS electro-thermal simulations. Different types of temperature profiles were applied to evaluate the feasibility of the proposed method. Simulation results showed that, for temperature profiles conventionally used in SPS cycles, the PID output keeps pace with the desired profile. Characterized by an imperfect time delay and overshoot/undershoot, the constructed PID controller needs further advancement to provide a more satisfactory temperature regulation for non-continuous temperature profiles. The first step towards a numerical rule for the optimal PID controller design was undertaken in this work. It is expected to provide a valuable reference for the advanced electro-thermal modeling of SPS.

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Composite of medium entropy alloys synthesized using spark plasma sintering

Cited by 19 publications

References 52 publications

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy

Fabrication of ZnO Ceramics with Defects by Spark Plasma Sintering Method and Investigations of Their Photoelectrochemical Properties

Proportional Integral Derivative Control in Spark Plasma Sintering Simulations

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Composite of medium entropy alloys synthesized using spark plasma sintering

Cited by 19 publications

References 52 publications

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)100-x Ni x medium-entropy alloy

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)100-x Ni x medium-entropy alloy

Fabrication of ZnO Ceramics with Defects by Spark Plasma Sintering Method and Investigations of Their Photoelectrochemical Properties

Proportional Integral Derivative Control in Spark Plasma Sintering Simulations

Contact Info

Product

Resources

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Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy

Effect of Ni content and crystallographic orientation on mechanical properties of single-crystal (CoCr)_100-xNi _x medium-entropy alloy