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通过XRD,SEM,EDS分析和显微硬度测试,研究了Fe含量对CrMoVNbFe_x高熵合金铸态组织的相结构变化、微观组织和力学性能的影响。结果表明,随Fe含量的增加,合金相结构由单一的bcc结构固溶体逐步转化为bcc和σ两相结构。合金的铸态组织为典型树枝晶,Mo主要分布在枝晶内,Fe和Cr主要分布在枝晶间,随Fe含量的增加,Nb在枝晶间的含量增加。随Fe含量的增加,合金的组织显著细化,而且显著提高合金的硬度,最高硬度达到HV950。
The effects of Fe content on the phase structure, microstructure and mechanical properties of as-cast CrMoVNbFe_x high-entropy alloy were investigated by XRD, SEM, EDS and microhardness tests. The results show that with the increase of Fe content, the alloy phase structure is gradually transformed from single bcc solid solution to bcc and σ two-phase structure. The as-cast microstructure of the alloy is typical dendrites. Mo is mainly distributed in the dendrites and Fe and Cr are mainly distributed among the dendrites. With the increase of Fe content, the content of Nb increases among the dendrites. With the increase of Fe content, the microstructure of the alloy is significantly refined, and the hardness of the alloy is significantly increased, and the maximum hardness reaches HV950.