High temperature deformation behavior of Al0.2CoCrFeNiMo0.5 high entropy alloy: Dynamic strain ageing

被引：13

作者：

Palguna, Yasam ^{[1
]}

Kotla, Sairam ^{[1
]}

Korla, Rajesh ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Mat Sci & Met Engn, Hyderabad 502285, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 930卷

关键词：

High entropy alloys; High temperature deformation; Dynamic strain ageing; Strain rate sensitivity; MECHANICAL-PROPERTIES; FLOW BEHAVIOR; MICROSTRUCTURE;

D O I：

10.1016/j.jallcom.2022.167422

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High temperature deformation behavior of Al0.2CoCrFeNiMo0.5 high entropy alloy was investigated in fully annealed condition. Microstructural studies were performed using SEM and EBSD, prior to testing, clearly shows a fully annealed microstructure consists of secondary sigma phase in the FCC matrix. Uniaxial tensile tests were performed in the temperature range of 25-900 degrees C at an initial strain rate of 10-3 s-1. Serrated plastic flow behavior was observed in the intermediate temperature range of 400-600 degrees C. The influence of the strain rate on the critical strain corresponding to the onset of serrations were studied which indicated that the serration behavior was type A and type C. Strain rate sensitivity close to zero, decrease in the elongation and microstructural investigations suggesting that dynamic strain aging (DSA) is the responsible mechanism for the serrated flow and that the Al solute interactions with dislocations might be the possible reason for DSA. Additionally, the fractography analysis clearly indicates that there is transition in the failure mode from the transgranular fracture to the intergranular fracture.(c) 2022 Elsevier B.V. All rights reserved.

引用

页数：9

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