scholarly journals Structure and toughening mechanical properties of multi principal component high entropy alloy

2021 ◽  
Vol 25 (6 Part A) ◽  
pp. 4019-4025
Author(s):  
Junhao Dai
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Principal Component ◽  
Alloy System ◽  
Strengthening Mechanism ◽  
High Entropy Alloy ◽  
Toughening Mechanism ◽  
High Entropy ◽  
Specific Strength ◽  
Deformation Ability

At present, the strength and toughening degree of the multi-principal element high entropy alloy are not high, and the plastic deformation capacity is poor. In order to solve this problem, the structure and mechanical properties of the multi-element high entropy alloy were studied. The micro-structure and strengthening mechanism of the alloy were studied. By establishing a reliable random solid solution model and using the first principle to calculate the phase structure, thermodynamics, and elastic properties of the alloy, theoretical guidance is provided for the design and development of new high entropy alloy. The high entropy alloy system with high specific strength and high tensile plasticity was prepared, and its strengthening and toughening mechanism was studied. The experimental results show that with the increase of Zr content, the fracture strength of multi-component high entropy alloy first increases and then decreases. When it reaches a fixed value, the comprehensive mechanical properties of the alloy are the best. Compared with the two literature methods, the tensile strength of this method is 250 MPa, and the work hardening after yielding makes the alloy have higher strength and better plastic deformation ability.

Influence of plastic deformation on the phase composition, texture, and mechanical properties of the CrMnFeCoNi2Cu high-entropy alloy

2015 ◽  
Vol 37 (1) ◽  
pp. 21-26 ◽  
Author(s):  
I. V. Karpets’ ◽  
O. M. Myslyvchenko ◽  
M. O. Krapivka ◽  
V. F. Gorban’ ◽  
O. S. Makarenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Phase Composition ◽  
High Entropy Alloy ◽  
High Entropy

Influence of alumina whisker or nano-carbon contents on the microstructure and mechanical properties of CuZrTiAlNi refractory high entropy alloy composites

2020 ◽  
Vol 62 (7) ◽  
pp. 678-688
Author(s):  
X. Jiang ◽  
J. Chen ◽  
H. Sun ◽  
Z. Shao
Keyword(s):  
Mechanical Properties ◽  
Load Transfer ◽  
Microwave Sintering ◽  
Fracture Morphology ◽  
Strengthening Mechanism ◽  
Cold Isostatic Pressing ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Structure And Property ◽  
Fine Grain

Abstract High-entropy alloy composites were fabricated by ball milling, cold isostatic pressing and microwave sintering to which were added varied contents of Al2O3 whiskers, La-Ce, and carbon nanotubes-graphene, respectively. The structure and mechanical properties of the composites were investigated by X-ray diffraction, scanning electron microscopy and a microhardness tester. The high-entropy alloy and composites show amorphous phases and some crystalline phases. Accordingly, the addition of the reinforcement phase can refine the grain size. The formation mechanism of the phase is mainly related to the factors of mixing entropy, enthalpy, differences in atomic size, and the structure and property of the elements. The hardness of the composites is higher than that of the alloy (437.5 HV), and those composites reinforced by 0.5 wt.-% nanotubes- 0.5 wt.-% graphene are the highest (593.99 HV). The fracture morphology of the Al2O3 whisker reinforced composite shows a river pattern, indicating brittle cleavage. According to the research results, it can be concluded that the strengthening mechanism of the high entropy alloy composites mainly reflects fine grain strengthening and load transfer, and the toughening mechanism mainly crack bridging and a pulling out of the reinforcing phase.

A new CrFeNi2Al eutectic high entropy alloy system with excellent mechanical properties

2019 ◽  
Vol 770 ◽  
pp. 655-661 ◽  
Author(s):  
Xi Jin ◽  
Juan Bi ◽  
Lu Zhang ◽  
Yang Zhou ◽  
Xingyu Du ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Alloy System ◽  
High Entropy Alloy ◽  
High Entropy

Effect of Ta Addition on Structural Evolution and Mechanical Properties of the CoFeNi2W0.5 High Entropy Alloy

2016 ◽  
Vol 849 ◽  
pp. 34-39 ◽  
Author(s):  
Li Jiang ◽  
Yong Dong ◽  
Hui Jiang ◽  
Yi Ping Lu ◽  
Zhi Qiang Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vickers Hardness ◽  
Solution Structure ◽  
Structural Evolution ◽  
Alloy System ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Microstructure And Mechanical Properties ◽  
Electron Microscopes

A series of CoFeNi2W0.5Tax (x = 0-0.6) high entropy alloys (HEAs) were synthesized by arc melting to investigate the alloying effect of Ta element on the microstructure and mechanical properties of the CoFeNi2W0.5 alloy system. Phase constitution, microstructure and mechanical properties of the alloys were analyzed by X-ray diffraction (XRD), scanning electron microscopes (SEM), Vickers hardness and compressive test. It was found that when x = 0, the alloy consists of a single-phase face-centered cubic (FCC) solid solution structure and exhibit excellent ductility, the compressive plastic elongation of which can reach 80% without fracture. While with increasing Ta content, the brittle Co2Ta-type Laves phase appears which leads to a decrease of the plastic strain and an increase of the yield strength, and the Vickers hardness shows an obvious increase from HV 179.5 to HV 753.2.

Microstructure and mechanical properties of AlCoxCrFeNi3-x eutectic high-entropy-alloy system

2020 ◽  
Vol 823 ◽  
pp. 153886 ◽  
Author(s):  
Yong Dong ◽  
Zeqiang Yao ◽  
Xuan Huang ◽  
Fengming Du ◽  
Chuanqiang Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Alloy System ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Microstructure And Mechanical Properties

Composition Dependence of Phase Stability, Deformation Mechanisms, and Mechanical Properties of the CoCrFeMnNi High-Entropy Alloy System

JOM ◽  
2014 ◽  
Vol 66 (10) ◽  
pp. 1993-2001 ◽  
Author(s):  
C. C. Tasan ◽  
Y. Deng ◽  
K. G. Pradeep ◽  
M. J. Yao ◽  
H. Springer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Stability ◽  
Composition Dependence ◽  
Alloy System ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
High Entropy
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