Stability of lamellar structures in CoCrFeNiNbx eutectic high entropy alloys at elevated temperatures

被引：155

作者：

He, Feng ^{[1
,2
]}

Wang, Zhijun ^{[1
,2
]}

Shang, Xuliang ^{[1
,2
]}

Leng, Chao ^{[1
,2
]}

Li, Junjie ^{[1
,2
]}

Wang, Jincheng ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

MATERIALS & DESIGN | 2016年 / 104卷

基金：

中国国家自然科学基金;

关键词：

High entropy alloys; Stability; Lamellar structures; MECHANICAL-PROPERTIES; SHAPE INSTABILITIES; MICROSTRUCTURE; DIFFUSION;

D O I：

10.1016/j.matdes.2016.05.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Eutectic high entropy alloys (EHEAs) are promising candidates for high temperature materials. The stability of eutectic structures of EHEAs at elevated temperatures is in need of examination before pursuing their high temperature applications. In this paper, the stability of eutectic structures in CoCrFeNiNbx EHEAs were characterized and examined. It is found that, the lamellar structures of the EHEAs are stable when the annealing temperature is lower than 750 degrees C but spheroidization of the lamellar structures occurs when the temperature goes up to 900 degrees C. The lamellar structures exhibit excellent mechanical properties. Although the mechanical properties decreases as the lamellar structures decay after annealing at 900 degrees C, the EHEAs of CoCrFeNiNbx maintain good mechanical properties. The evolution of lamellar structures over time at 750 degrees C was also reported. The application of classical lamellar instability theory in HEAs was discussed. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：259 / 264

页数：6

共 31 条

[1]

Balluffi RW, 2005, KINETICS OF MATERIALS, P1

[2] SHAPE INSTABILITIES OF EUTECTIC COMPOSITES AT ELEVATED TEMPERATURES [J].