Experimental assessment of the thermodynamic factor for diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys

被引：40
|
作者：
Vaidya, M. [1 ]
Muralikrishna, G. Mohan [1 ]
Divinski, S., V [2 ,3 ]
Murty, B. S. [1 ]
机构：
[1] Indian Inst Technol Madras, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
[2] Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany
[3] Samara Natl Res Univ, Moskovskoye Shosse 34, Samara 443086, Russia
来源：
SCRIPTA MATERIALIA | 2018年 / 157卷
关键词：
High entropy alloys; Interdiffusion; Pseudo-binary; Thermodynamic factor; TRACER DIFFUSION; SLUGGISH DIFFUSION; INTERDIFFUSION; MN; COEFFICIENTS;
D O I：
10.1016/j.scriptamat.2018.07.040
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The present work provides a first experimental assessment of the product of thermodynamic factor (Phi) and the cross correlation term (S) for high entropy alloys. Following a pseudo-binary approach, the concentration dependent interdiffusion coefficients are determined for CoCrFeNi and CoCrFeMnNi high-entropy alloys at 1423 K using four different diffusion couples. Combining the data with the measured previously tracer diffusion coefficients, the value of Phi S for the equiatomic compositions is found to be close to unity for CoCrFeNi while a value of 3 to 5 is obtained for CoCrFeMnNi indicating deviations from the ideal solid solution. The interdiffusion coefficients are higher for CoCrFeMnNi substantiating the fact that an increased configurational entropy need not result in decelerated rates of the atomic transport. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：81 / 85
页数：5
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