Precipitation in the equiatomic high-entropy alloy CrMnFeCoNi

SCRIPTA MATERIALIA

卷:113

Article

Pickering, E. J.¹  Munoz-Moreno, R.¹  Stone, H. J.¹  Jones, N. G.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3, England

关键词: High-entropy alloys;    Thermal stability;    Precipitation;    Metallurgy;    TEM;   

DOI  :  10.1016/j.scriptamat.2015.10.025

来源: Elsevier

【 摘 要 】

CrMnFeCoNi is widely considered to be an exemplar high-entropy alloy, which is stable as a single solid-solution phase at all temperatures below its melting point. Here, for the first time, the formation of two distinct types of Cr-rich precipitate in coarse-grained CrMnFeCoNi is reported following prolonged exposures at 700 degrees C. The precipitates were identified as M23C6 and the sigma phase, and their formation in unworked material during heat treatments without an applied stress indicated that they are equilibrium phases. Therefore, CrMnFeCoNi can no longer be regarded as thermodynamically stable as a single phase at all temperatures below its solidus. (C) 2015 Elsevier Ltd.

【 授权许可】

Free