Ultra-fine grain TixVNbMoTa refractory high-entropy alloys with superior mechanical properties fabricated by powder metallurgy

2021 ◽  
Vol 865 ◽  
pp. 158592
Author(s):  
Qing Liu ◽  
Guofeng Wang ◽  
Xiaochong Sui ◽  
Ye Xu ◽  
Yongkang Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Fine Grain ◽  
Superior Mechanical Properties

scholarly journals Microstructure and Mechanical Property Evolution during Annealing of a Cold-Rolled Metastable Powder Metallurgy High Entropy Alloy

Entropy ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 833 ◽  
Author(s):  
Li ◽  
Qiu ◽  
Guo ◽  
Liu ◽  
Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Cold Deformation ◽  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
Σ Phase ◽  
High Entropy ◽  
Fine Grain

Precipitation strengthening is an effective approach to strengthen high-entropy alloys (HEAs) with a simple face-center-cubic (FCC) structure. In this work, CoCrFeNiMo0.2 HEAs were prepared by powder metallurgy, followed by cool rolling and subsequent heat-treatment at different temperatures. The effects of cold working and annealing on microstructure and mechanical properties have been investigated. Results show the fine and dispersed (Cr, Mo)-rich σ phase with a topologically close-packed structure precipitated in the FCC matrix after the prior cold deformation process, which enhanced the mechanical property of the CoCrFeNiMo0.2 alloy. The HEA annealed at 600 °C for 48 h had a tensile strength of 1.9 GPa but an elongation which decreased to 8%. The HEA annealed at 800 °C for 12 h exhibited a tensile strength of 1.2 GPa and an elongation of 31%. These outstanding mechanical properties can be attributed to precipitation strengthening and fine-grain strengthening.

scholarly journals Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

2019 ◽  
Vol 25 (4) ◽  
pp. 930-945 ◽  
Author(s):  
Łukasz Rogal ◽  
Zbigniew Szklarz ◽  
Piotr Bobrowski ◽  
Damian Kalita ◽  
Grzegorz Garzeł ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Microstructure And Mechanical Properties

scholarly journals Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

2022 ◽  
Vol 8 ◽  
Author(s):  
Wei Jiang ◽  
Yuntian Zhu ◽  
Yonghao Zhao
Keyword(s):  
Mechanical Properties ◽  
Review Paper ◽  
Back Stress ◽  
Industrial Applications ◽  
Deformation Mechanisms ◽  
High Entropy Alloys ◽  
High Entropy ◽  
The World ◽  
Superior Mechanical Properties ◽  
Principal Elements

Recently, heterostructured (HS) materials, consisting of hard and soft zones with dramatically different strengths, have been developed and received extensive attention because they have been reported to exhibit superior mechanical properties over those predicted by the rule of mixtures. Due to the accumulation of geometrically necessary dislocations during plastic deformation, a back stress is developed in the soft zones to increase the yield strength of HS materials, which also induce forward stress in the hard zones, and a global hetero-deformation induced (HDI) hardening to retain ductility. High-entropy alloys (HEAs) and medium-entropy alloys (MEAs) or multicomponent alloys usually contain three or more principal elements in near-equal atomic ratios and have been widely studied in the world. This review paper first introduces concepts of HS materials and HEAs/MEAs, respectively, and then reviewed emphatically the mechanical properties and deformation mechanisms of HS HEAs/MEAs. Finally, we discuss the prospect for industrial applications of the HS HEAs and MEAs.

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