退火处理对CoCrFeNiMn高熵合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2024.08.016

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 102-107.DOI: 10.13251/j.issn.0254-6051.2024.08.016

退火处理对CoCrFeNiMn高熵合金组织和性能的影响

王春兴, 李明

内蒙古工业大学材料科学与工程学院, 内蒙古呼和浩特 010051

收稿日期:2024-01-24 修回日期:2024-06-16 出版日期:2024-08-25 发布日期:2024-09-27
通讯作者: 李明,副教授,E-mail:328060622@qq.com
作者简介:王春兴(1998—),男,硕士研究生,主要研究方向为高熵合金的组织性能,E-mail:1215331237@qq.com。
基金资助:
2022年自治区自然科学基金(RZ2200001871)

Effect of annealing on microstructure and properties of CoCrFeNiMnhigh entropy alloy

Wang Chunxing, Li Ming

School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China

Received:2024-01-24 Revised:2024-06-16 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 对铸态CoCrFeNiMn高熵合金进行不同温度(600、850和1000 ℃)的退火处理,研究了退火温度对其组织性能的影响。结果表明,铸态及退火态CoCrFeNiMn高熵合金均为单相FCC结构,组织为典型的树枝晶结构,枝晶间有米粒状物质析出。与铸态相比,600 ℃退火后,合金中析出物不连续,发生回溶现象,其抗拉强度增加到468.21 MPa,断后伸长率提升到42.38%,硬度下降到143 HV0.2;850 ℃退火后,合金中析出物增多且均匀弥散分布,其抗拉强度下降到446.61 MPa,断后伸长率增加到50.56%,硬度上升到161 HV0.2;1000 ℃退火后,合金中析出物发生第二次回溶现象,其抗拉强度下降到436.54 MPa,断后伸长率降为44.54%,硬度略微下降。综合比较,850 ℃退火合金的综合力学性能最为优异。

关键词: CoCrFeNiMn高熵合金, 退火, 析出物, 力学性能

Abstract: Effect of annealing temperature on microstructure and properties of the as-cast CoCrFeNiMn high entropy alloy was studied by annealing at different temperatures (600, 850 and 1000 ℃). The results show that both the as-cast and annealed CoCrFeNiMn high entropy alloys have a single-phase FCC structure, the microstructure is a typical dendritic structure, and there are grain like particles precipitated between dendrites. Compared with the as-cast state, after annealing at 600 ℃, the precipitates in the alloy are discontinuous and redissolved, the tensile strength increases to 468.21 MPa, the elongation after fracture increases to 42.38%, and the hardness decreases to 143 HV0.2. After annealing at 850 ℃, the precipitates in the alloy increase and are uniformly dispersed, the tensile strength decreases to 446.61 MPa, the the elongation after fracture increases to 50.56%, and the hardness increases to 161 HV0.2. After annealing at 1000 ℃, the precipitates in the alloy dissolve again, the tensile strength decreases to 436.54 MPa, the elongation after fracture decreases to 44.54%, and the hardness decreases slightly. By comprehensive comparison, the comprehensive mechanical properties of the alloy annealed at 850 ℃ are the best.

Key words: CoCrFeNiMn high entropy alloy, annealing, precipitates, mechanical properties

中图分类号:

王春兴, 李明. 退火处理对CoCrFeNiMn高熵合金组织和性能的影响[J]. 金属热处理, 2024, 49(8): 102-107.

Wang Chunxing, Li Ming. Effect of annealing on microstructure and properties of CoCrFeNiMnhigh entropy alloy[J]. Heat Treatment of Metals, 2024, 49(8): 102-107.

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退火处理对CoCrFeNiMn高熵合金组织和性能的影响

Effect of annealing on microstructure and properties of CoCrFeNiMnhigh entropy alloy

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