Strengthening mechanism of CoCrNiMox high entropy alloys by high-throughput nanoindentation mapping technique

被引：31

作者：

Tong, Yonggang ^{[1
]}

Zhang, Hao ^{[1
]}

Huang, Hongfeng ^{[2
]}

Yang, Lingwei ^{[3
]}

Hu, Yongle ^{[1
]}

Liang, Xiubing ^{[4
]}

Hua, Manyu ^{[1
]}

Zhang, Jian ^{[1
]}

机构：

[1] Changsha Univ Sci & Technol, Coll Automobile & Mech Engn, Changsha 410114, Peoples R China

[2] Guilin Univ Technol, Coll Mat Sci & Engn, Guilin 541004, Peoples R China

[3] China Aerodynam Res & Dev Ctr, Hyperveloc Aerodynam Inst, Mianyang 621000, Sichuan, Peoples R China

[4] Acad Mil Sci PLA China, Natl Inst Def Technol Innovat, Beijing 100071, Peoples R China

来源：

INTERMETALLICS | 2021年 / 135卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

A; high-entropy alloys; B; mechanical properties; D; microstructurex; microstructure F; nanoindentation; FRACTURE; DESIGN; PHASE;

D O I：

10.1016/j.intermet.2021.107209

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel nanoindentation mapping technique was employed to correlate the microstructure, composition and mechanical properties of the fcc, laves and lamellae in CoCrNiMox high-entropy alloys with varying Mo content. The results suggest that the Young's modulus of the 3 constituents were comparable, averaging X230 GPa. Despite this, the hardness was quite different. The fcc phase in CoCrNiMox was mainly strengthened by a solute strengthening mechanism, and the hardness was increased from X3.98 GPa to X4.45 GPa, as the atomic percentage of Mo in fcc increased from X7.4% to 15.4%. A solute strengthening model a accounting lattice distortion was employed to correlate the strengthening effect in fcc with Mo content. The laves phase was rich in Mo composition (X28.6%) and exhibited an ultrahigh hardness, X9.13 GPa, which was X2 times higher than that of fcc phase. Finally, the lamellae colonies, made up by alternative fcc and laves phases, had an intermediate hardness, X6.36 GPa. This was well explained by a rule-of-mixture model.

引用

页数：7

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