Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high-entropy alloys: Kinetic hints towards a low-temperature phase instability of the solid-solution?

被引：52

作者：

Gaertner, Daniel ^{[1
]}

Kottke, Josua ^{[1
]}

Chumlyakov, Yury ^{[2
]}

Hergemoeller, Fabian ^{[1
]}

Wilde, Gerhard ^{[1
]}

Divinski, Sergiy, V ^{[1
,3
]}

机构：

[1] Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany

[2] Tomsk State Univ, Dept Phys Met, 36 Lenin Ave, Tomsk 634050, Russia

[3] Samara Natl Res Univ, Moskovskoye Shosse 34, Samara 443086, Russia

来源：

SCRIPTA MATERIALIA | 2020年 / 187卷

关键词：

High-entropy alloys; CoCrFeMnNi; Diffusion; Single-crystals; Correlation factors; FE-MN-NI; SLUGGISH DIFFUSION; MULTICOMPONENT; STABILITY; PRECIPITATION;

D O I：

10.1016/j.scriptamat.2020.05.060

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tracer-diffusion of constituting elements in single-crystalline CoCrFeNi and CoCrFeMnNi is measured from 923 K to 1373 K. In CoCrFeMnNi, low-temperature deviations from otherwise linear Arrhenius-type dependencies are seen for all elements excluding Mn. The kinks are prominent at about 1100 K for Co and Ni and at 900 K for Cr and Fe indicating the existence of a low-temperature modification of the equiatomic solid-solution phase in CoCrFeMnNi. The temperature-dependent correlation factors of all elements are determined within the framework of the random alloy model providing insights into potential mechanisms of the kinetic anomaly. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：57 / 62

页数：6

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