Co含量对Co_(x)Cr_(25)(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 Co_(x)Cr_(25)(AlFeNi)_(75-x)high entropy alloy

作　　者：黄东 庄艳歆[1] Huang Dong;Zhuang Yanxin(Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2024年第1期60-64,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(21978045);东北大学博士生科研创新项目(N2009007)。

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Co_(x)Cr_(25)(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;Co_(45)Cr_(25)Al_(10)Fe_(10)Ni_(10)合金的屈服强度约为850 MPa,而Co_(57)Cr_(25)Al_(6)Fe_(6)Ni_(6)合金的屈服强度下降到不足500 MPa.此外,随着Co含量的增加,Co_(51)Cr_(25)Al_(8)Fe_(8)Ni_(8)和Co_(57)Cr_(25)Al_(6)Fe_(6)Ni_(6)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.In view of the low yield strength of FCC based TRIP high entropy alloy,Co_(x)Cr_(25)(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 Co_(45)Cr_(25)Al_(10)Fe_(10)Ni_(10)alloy is about 850 MPa,while the yield strength of Co_(57)Cr_(25)Al_6Fe_(6)Ni_(6)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 Co_(51)Cr_(25)Al_(8)Fe_(8)Ni_(8)and Co_(57)Cr_(25)Al_(6)Fe_(6)Ni_(6)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 

分 类 号：TG135[一般工业技术—材料科学与工程]