SPS制备W-9.5Ni<sub>3</sub>Al-0.5YF<sub>3</sub>合金的显微结构及力学性能

SPS制备W-9.5Ni₃Al-0.5YF₃合金的显微结构及力学性能

摘要: 采用球磨法和放电等离子烧结法制备了W-9.5Ni₃Al-0.5YF₃合金，分析了烧结温度对合金致密度、物相、显微结构和力学性能的影响。结果表明，YF₃分布在粘结相中有利于降低合金的致密化烧结温度，原位生成的Al₂O₃可以起到细化晶粒和提升力学性能的作用。该合金在1250℃时的抗弯强度、硬度、致密度和晶粒尺寸分别为982.8 MPa、72.8 HRA、99.5%、1.53 μm，具有较好的综合力学性能。

Abstract: W-9.5Ni₃Al-0.5YF₃ alloy was prepared by ball milling and spark plasma sintering (SPS). The effects of sintering temperature on the densification,phases,microstructure and mechanical properties of the alloy were analyzed. The results show that the distribution of YF₃ in the bonded phase is beneficial to reduce the densification sintering temperature of the alloy. The in-situ generated Al₂O₃ can play a role in refining the grains and enhancing the mechanical properties. The flexural strength,hardness,densification and grain size of the alloy at 1250 ℃are 982.8 MPa,72.8 HRA,99.5%and 1.53 μm,respectively,and the alloy has good overall mechanical properties.