Lamellar structure thermal stability of inmedium-entropy eutectic CrCoNiNb0.4 alloy

doi:10.13251/j.issn.0254-6051.2020.06.031

Abstract

Abstract: Thermal stability of lamellar structure in CrCoNiNb_0.4medium-entropy eutectic alloy was characterized and examined. The results show that the lamellar structures in CrCoNiNb_0.4 medium-entropy alloy are stable when the heat treatment temperature is blower than 1023 K. While the heat treatment time increase from 24 h to 168 h, the lamellar spacing of lamellar structures in CrCoNiNb_0.4 eutectic alloy increases from about 0.19 μm to about 0.39 μm, and more and more precipitation phases are detected in the lamellar spacing, meanwhile, boundary splitting and edge spheroidization can be found in CrCoNiNb_0.4 eutectic alloy. The hardness of CrCoNiNb0.4 eutectic alloy shows a tendency of increase first and decrease later with the increase of heat treatment time under the synergy effect of precipitation strength and lamellar structure failure.

Key words: medium-entropy eutectic alloy, CrCoNiNb_0.4, thermal stability

CLC Number:

TG139

Wang Chengjie, Huang Chunhua, Li Jianwen. Lamellar structure thermal stability of inmedium-entropy eutectic CrCoNiNb_0.4 alloy[J]. Heat Treatment of Metals, 2020, 45(6): 149-152.

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Lamellar structure thermal stability of inmedium-entropy eutectic CrCoNiNb_0.4 alloy

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