Strengthening mechanisms in CrMoNbTiW refractory high entropy alloy

被引：47

作者：

Raman, Lavanya ^{[1
]}

Anupam, Ameey ^{[1
,2
]}

Karthick, G. ^{[1
]}

Berndt, Christopher C. ^{[2
]}

Ang, Andrew Siao Ming ^{[2
]}

Murty, S. V. S. Narayana ^{[3
]}

Fabijanic, Daniel ^{[4
]}

Murty, B. S. ^{[1
,5
]}

Kottada, Ravi Sankar ^{[1
]}

机构：

[1] Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India

[2] Swinburne Univ Technol, Surface Engn Adv Mat SEAM, Hawthorn, Vic 3122, Australia

[3] Vikram Sarabhai Space Ctr, Mat & Met Grp, Trivandrum 695022, Kerala, India

[4] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3220, Australia

[5] Indian Inst Technol Hyderabad, Kandi 502285, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 819卷

基金：

澳大利亚研究理事会;

关键词：

Refractory high entropy alloy; Strengthening mechanisms; Solid solution strengthening; Hot compression; Yield strength prediction; LATTICE DISTORTION; MICROSTRUCTURE; TEMPERATURE;

D O I：

10.1016/j.msea.2021.141503

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We have investigated the strengthening mechanisms of as-cast CrMoNbTiW BCC refractory high entropy alloy (RHEA). The cast RHEA was deformed at a constant strain rate of 10(-3) s(-1) and a temperature range of 1100-1300 degrees C. The various factors contributing to the overall strength of the cast alloy are explored with comprehensive experimental evidence. In as-cast RHEA, solid solution strengthening is the dominant mechanism among other factors. A modified Varvenne's solid solution strengthening model is used to predict the yield strength (YS) of the RHEA at high temperatures. The experimentally determined YS exhibits a strong temperature dependence, and the predicted YS values are significantly affected by the temperature-dependent material constants. The absolute value of the predicted YS depends on the shear modulus, whereas the variation of YS with temperature is affected by the Poisson's ratio. Moreover, our study demonstrates that it is feasible to predict the high temperature YS using material constants from literature besides DFT studies.

引用

页数：10

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