Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

被引：21

作者：

Du, X. H. ^{[1
]}

Huo, X. F. ^{[1
]}

Chang, H. T. ^{[1
]}

Li, W. P. ^{[2
]}

Duan, G. S. ^{[1
]}

Huang, J. C. ^{[2
]}

Wu, B. L. ^{[1
]}

Zou, N. F. ^{[1
]}

Zhang, L. ^{[1
]}

机构：

[1] Shenyang Aerosp Univ, Sch Mat Sci & Engn, Shenyang, Peoples R China

[2] City Univ Hong Kong, Dept Mat Sci Engn, Kowloon, Hong Kong, Peoples R China

来源：

MATERIALS RESEARCH EXPRESS | 2020年 / 7卷 / 03期

关键词：

high-entropy alloys; multiple-phase microstructure; mechanical properties; strengthening and toughening mechanisms; PLASTIC-DEFORMATION; FRICTION STRESS; EVOLUTION; BEHAVIOR; PHASE; TRANSFORMATION; NANOPARTICLES; IMPROVEMENT; CAST;

D O I：

10.1088/2053-1591/ab7a64

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 degrees C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L1(2) structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.

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