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用粉末冶金法制备Ni-Fe-Al合金,将元素Ni、Fe、Al粉混合后在500 MPa的压力下进行压制成形,分别在1280℃和1300℃下进行烧结,对烧结坯进行密度、拉伸力学性能检测、X射线衍射分析、断口及组织观察。结果表明,在1280℃烧结时NiFe18.5Al25合金密度可达6.57 g/cm3(相对密度为94.3%),抗拉强度达到718.7 MPa,说明采用粉末冶金法可制备高性能Ni-Fe-Al合金。烧结Ni-Fe-Al合金中γ相的体积分数随Ni含量增加而增加,相对密度和抗拉强度随Ni含量的增加而提高,说明γ相的增加有利于烧结。对比三种合金,NiFe18.5Al25合金性能最优,主要是由于该合金中γ相体积分数最高。
Ni-Fe-Al alloy is prepared by powder metallurgy method, the elements Ni, Fe and Al powder are mixed and pressed under the pressure of 500 MPa, respectively, and are sintered at 1280 DEG C and 1300 DEG C respectively. The density, Tensile mechanical properties testing, X-ray diffraction analysis, fracture and microstructure observation. The results show that the density of NiFe18.5Al25 alloy reaches 6.57 g / cm3 (relative density 94.3%) and the tensile strength reaches 718.7 MPa when sintered at 1280 ℃, which shows that high performance Ni-Fe-Al alloy can be prepared by powder metallurgy. The volume fraction of γ phase in sintered Ni-Fe-Al alloy increases with the increase of Ni content, and the relative density and tensile strength increase with the increase of Ni content, indicating that the increase of γ phase is beneficial to sintering. Comparison of the three alloys, NiFe18.5Al25 alloy performance is optimal, mainly due to the highest γ-phase volume fraction of the alloy.