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金属学报  2020, Vol. 56 Issue (3): 333-339    DOI: 10.11900/0412.1961.2019.00274
  研究论文 本期目录 | 过刊浏览 |
1. 西安理工大学材料科学与工程学院 西安 710048
2. 西北工业大学凝固技术国家重点实验室 西安 710072
Partially Recrystallized Structure and Mechanical Properties of CoCrFeNiMo0.2 High-Entropy Alloy
CAO Yuhan1,WANG Lilin2,WU Qingfeng2,HE Feng2(),ZHANG Zhongming1,WANG Zhijun2
1. Department of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi‘an 710072, China
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通过深冷轧制再结晶处理,在CoCrFeNiMo0.2高熵合金中实现了典型的不完全再结晶组织,并研究了其对力学性能的影响。对比研究了室温和深冷轧制及热处理后的不完全再结晶组织。结果表明,CoCrFeNiMo0.2高熵合金室温轧制35% (RTR35%)和深冷轧制35% (CTR35%)试样经800 ℃、30 min退火处理,均产生了由未再结晶的大晶粒和再结晶细小晶粒组成的不完全再结晶组织。深冷轧制能提高合金的再结晶速率,退火后产生的再结晶细小晶粒体积分数更高,更有利于提高合金的加工硬化能力。因此,CTR35%退火试样的屈服强度为539.3 MPa,延伸率为46.8%,与RTR35%退火试样相比,其屈服强度相似,但延伸率提高了30%。

关键词 高熵合金轧制变形退火处理不完全再结晶组织力学性能    

In recent years, high-entropy alloys have triggered broad research interests due to their unique and intriguing mechanical properties. In general, the increase in strength is accompanied by the reduction in ductility. Therefore, strong and ductile metallic materials have always been pursued by metallurgist. Heterogeneous structure has been reported to be very useful for overcoming the strength-ductility trade-off in metallic materials. In this work, typical partially recrystallized structure has been obtained in CoCrFeNiMo0.2 high-entropy alloy by cryogenic rolling and annealing. The effect of partially recrystallized structure on the mechanical properties has been studied. After 35% cold rolling (RTR35%) and 35% cryogenic rolling (CTR35%) and annealed at 800 ℃ for 30 min, CoCrFeNiMo0.2 high-entropy alloys developed partially recrystallization microstructures featured by coarse deformed grains and fine recrystallized grains. The yield strength of the CTR35% sample is 539.3 MPa and its elongation is 46.8%, which is similar in strength but 30% higher in elongation when compared with the RTR35% sample. This can be understood from the fact that samples rolled at cryogenic temperature showed a higher volume fraction of fine recrystallized grains, resulting in better strain hardening capability.

Key wordshigh-entropy alloy    rolling deformation    annealing treatment    partially recrystallized structure    mechanical property
收稿日期: 2019-08-16     
ZTFLH:  TG335.12  
通讯作者: 何峰     E-mail:
Corresponding author: Feng HE     E-mail:
作者简介: 曹育菡,女,1995年生,硕士生


曹育菡,王理林,吴庆峰,何峰,张忠明,王志军. CoCrFeNiMo0.2高熵合金的不完全再结晶组织与力学性能[J]. 金属学报, 2020, 56(3): 333-339.
Yuhan CAO, Lilin WANG, Qingfeng WU, Feng HE, Zhongming ZHANG, Zhijun WANG. Partially Recrystallized Structure and Mechanical Properties of CoCrFeNiMo0.2 High-Entropy Alloy. Acta Metall Sin, 2020, 56(3): 333-339.

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图1  CoCrFeNiMo0.2高熵合金的初始试样、RTR35%和CTR35%试样及其不同热处理试样的硬度
图2  CoCrFeNiMo0.2高熵合金初始试样的XRD谱和显微组织的OM像
图3  CoCrFeNiMo0.2高熵合金RTR35%和CTR35%试样及其经800 ℃、30 min退火处理后显微组织的OM像
图4  CoCrFeNiMo0.2高熵合金RTR35%和CTR35%试样经800 ℃、30 min退火处理后的EBSD像
图5  CoCrFeNiMo0.2高熵合金的初始试样、RTR35%和CTR35%试样及其经800 ℃、30 min退火处理试样的拉伸应力-应变曲线与加工硬化速率曲线
Sampleσy / MPaσb / MPaδ / %
Initial condition248.2623.184.7
RTR35%+800 ℃, 30 min545.9813.536.1
CTR35%+800 ℃, 30 min539.3829.946.8
表1  CoCrFeNiMo0.2合金的初始试样、RTR35%和CTR35%试样及其经800 ℃、30 min退火处理试样的屈服强度(σy)、抗拉强度(σb)以及伸长率(δ)
图6  CoCrFeNiMo0.2高熵合金RTR35%和CTR35%试样经800 ℃、30 min退火处理后显微组织的SEM像
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