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将高熵合金多主元设计思想与金属间化合物的设计理念相结合，采用真空电弧熔炼法制备了以B2有序金属间化合物为基体的TiZrHfCox(x=2.6～3.2)系列高熵合金，研究了Co含量以及热处理温度对合金晶体结构、微观组织和力学性能的影响。结果表明：该系列高熵合金在铸态和热处理后，其基体均为有序B2结构，值得注意的是，TiZrHfCo2.9合金呈现出单相B2结构，具备高强度的同时还具备一定塑韧性，其屈服强度、抗压强度、压缩率分别为1.25 GPa、1.50 GPa和7.74%;另外，此合金还表现出较强的热稳定性和高温性能，在900℃退火后合金晶体结构没发生改变，在1200℃退火后仍保持较高的强度，其屈服强度和抗压强度分别为1.10和1.27 GPa,而且随退火温度的升高，合金的硬度显著增加。
Abstract：Combining the multi-principal component design concept of high-entropy alloys with the design philosophy of intermetallic compounds, TiZrHfCox(x=2.6-3.2) series high-entropy alloys with B2 ordered intermetallic compound as the matrix were prepared by vacuum arc melting. The effects of Co content and heat treatment temperature on the crystal structure, microstructure, and mechanical properties of the alloys were studied. The results show that the matrix of this series of high-entropy alloys is an ordered B2 structure in both as-cast and heat-treated states. It is worth noting that the TiZrHfCo2.9 alloy exhibits a single-phase B2 structure, which has high strength and certain plasticity and toughness. Its yield strength, compressive strength, and compression ratio are 1.25 GPa, 1.50 GPa and 7.74%, respectively. In addition, the TiZrHfCo2.9 alloy also exhibits strong thermal stability and high-temperature performance, after annealing at 900 ℃, the crystal structure of the alloy does not change, after annealing at 1200 ℃, the alloy still maintains high strength, with a yield strength and compressive strength of 1.10 GPa and 1.27 GPa, respectively. Moreover, the hardness of the alloy increases significantly with the increase of annealing temperature.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-zt07
中图分类号:TG139
引用信息:
[1]尹爽,刘亮,段凯等.TiZrHfCo_x高熵金属间化合物合金的微观组织和力学性能[J].材料热处理学报,2025,46(07):81-88.DOI:10.13289/j.issn.1009-6264.2025-zt07.
基金信息:
辽宁省兴辽英才项目(XLYC2203060)