Microstructure and mechanical properties of FeCoNiCr high-entropy alloy strengthened by nano-Y2O3 dispersion

被引：43

作者：

Jia Bei ^{[1
]}

Liu XiongJun ^{[1
]}

Wang Hui ^{[1
]}

Wu Yuan ^{[1
]}

Lu ZhaoPing ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

SCIENCE CHINA-TECHNOLOGICAL SCIENCES | 2018年 / 61卷 / 02期

基金：

中国国家自然科学基金;

关键词：

high entropy alloy; oxide dispersion strengthening; mechanical alloying; microstructure; mechanical property; TENSILE PROPERTIES; PRECIPITATION; BEHAVIOR; EVOLUTION; EUROFER;

D O I：

10.1007/s11431-017-9115-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this manuscript, the FeCrCoNi high entropy alloy strengthened by nano-Y2O3 particles was synthesized via mechanical alloying and spark plasma sintering. Effects of Y2O3 additions on the microstructure and mechanical properties were investigated. The oxide-dispersion-strengthened (ODS) high-entropy alloy bearing 5wt% Y2O3 was found to have a finer grain with respect to the single-phase face-centered cubic (FCC) alloy without oxides. Consequently, the yield strength increased from 654 to 1754 MPa, and the fracture strength reached up to 2325 MPa while the plasticity decreased appreciably for the ODS high-entropy alloy. The synergic effects of grain size hardening and particle strengthening on mechanical properties of the ODS HEA were discussed. This finding indicates that the addition of nano-scaled oxides is an effective and feasible approach to designing HEAs with superior mechanical properties.

引用

页码：179 / 183

页数：5

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