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农智升,张波,朱景川.退火对CrCuFeMnTi高熵合金组织结构和力学性能的影响[J].稀有金属材料与工程(英文),2018,47(9):2827~2832.[Nong Zhisheng,Zhang Bo and Zhu Jingchuan.Effect of Annealing on Microstructures and Mechanical Properties of CrCuFeMnTi High Entropy Alloy[J].Rare Metal Materials and Engineering,2018,47(9):2827~2832.]
Effect of Annealing on Microstructures and Mechanical Properties of CrCuFeMnTi High Entropy Alloy
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Received:October 14, 2016  Revised:February 28, 2017
DOI:
Key words: CrCuFeMnTi high entropy alloy  Annealing  Microstructures  Phase transition
Foundation item:辽宁省博士启动基金资助(项目号201501079);国家自然科学基金资助(项目号51401131)
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Nong Zhisheng,Zhang Bo and Zhu Jingchuan  
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Abstract:
      In order to investigate the effect of annealing treatment on microstructures and mechanical properties of CrCuFeMnTi high entropy alloy, the as-cast CrCuFeMnTi alloy ingot was prepared by vacuum arc melting under the argon protection, and then the microstructures observation and mechanical properties testing of alloy samples under annealing treatment at different temperatures were performed. The results show that the as-cast CrCuFeMnTi alloy is composed of a hexagonal close packed and a face centered cubic solid solutions, and typical microstructures with dendrite and interdendrite phases are observed. The element diffusion and morphologies homogenization mainly proceed when the annealing temperature is under 750℃, and the hexagonal close packed phase would transforms into body centered phase after alloy annealed at 900℃. This phase transition is caused and controlled by the element diffusion. The hardness and strength of alloy are all improved when alloy is annealed at below 750℃, meanwhile, the alloys all show the brittle fracture character.