Co含量对CoxCr25(AlFeNi)75-x高熵合金组织和力学性能的影响

Effect of Co content on microstructure and mechanical properties of CoxCr25(AlFeNi)75-x high entropy alloy

黄东 ¹庄艳歆¹

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作者信息

1. 东北大学材料电磁过程研究教育部重点实验室,沈阳 110819
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摘要

针对FCC基TRIP高熵合金屈服强度较低的问题,设计并制备了CoxCr25(AlFeNi)75-x合金体系,实现了B2相的沉淀强化与FCC-HCP形变诱导相变的协同.利用热力学模拟与实验相结合的方法,探究了Co含量对于合金体系组织和力学性能的影响.结果表明:随着Co含量(原子数分数,下同)的增加,合金中析出的B2相逐渐减少,从而导致其屈服强度下降;Co45 Cr25 Al10 Fe10 Ni10合金的屈服强度约为850 MPa,而Co57 Cr25 Al6 Fe6 Ni6合金的屈服强度下降到不足500 MPa.此外,随着Co含量的增加,Co51 Cr25 Al8 Fe8 Ni8和Co57 Cr25 Al6 Fe6 Ni6合金在拉伸过程中均发生了形变诱导的FCC-HCP型马氏体相变,这使得它们拥有接近50％的良好塑性.

Abstract

In view of the low yield strength of FCC based TRIP high entropy alloy,CoxCr25(AlFeNi)75-x alloy system was designed and prepared to achieve the synergy between precipitation strengthening of B2 phase and FCC-HCP type deformation induced transformation.The effect of Co content on the microstructure and mechanical properties of the alloy system was investigated using a method combining thermodynamic simulation and experiment.The results show that with the increase of Co content,the precipitated B2 phase in the alloy gradually decreases,resulting in a decrease of yield strength.The yield strength of Co45 Cr25 Al10 Fe10 Ni10 alloy is about 850 MPa,while the yield strength of Co57 Cr25 Al6 Fe6 Ni6 alloy decreases to less than 500 MPa.On the other hand,with the increase of Co content,deformation induced FCC-HCP martensitic transformation occurs in Co51 Cr25 Al8 Fe8 Ni8 and Co57 Cr25 Al6 Fe6 Ni6 alloys during tensile test,which makes them have good plasticity close to 50％.

关键词

高熵合金/力学性能/沉淀强化/形变诱导相变

Key words

high entropy alloy/mechanical properties/precipitation strengthening/deformation induced transformation

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基金项目

国家自然科学基金(21978045)

东北大学博士生科研创新项目(N2009007)

出版年

2024

材料与冶金学报

东北大学

材料与冶金学报

北大核心

影响因子：0.516

ISSN：1671-6620

参考文献量18

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