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采用真空自耗电弧熔炼法制备了密度为6.0g/cm3的NbTiAlCrSi合金,并通过光学显微镜、扫描电镜、能谱仪等对其进行了组织观察和分析。结果表明:合金组织由(Nb,Ti)5Si3和(Nb,X)SS两相组成(X代表Ti、Al、Cr等元素),(Nb,Ti)5Si3呈条、块状网络连续分布的特点。对合金铸锭进行1 400℃/9h均匀化退火处理不能显著改变(Nb,Ti)5Si3条、块的大小,但使得(Nb,Ti5)Si3第二相分布由连续的条、块转变为不连续的(Nb,Ti)5Si3块。该合金热轧态的抗拉强度达704MPa,室温拉伸脆断。M5Si3型化合物特性以及热轧态中第二相与基体界面处所存在的细微孔隙导致了合金的脆性。
NbTiAlCrSi alloy with a density of 6.0g / cm3 was prepared by vacuum consumable arc melting method. The microstructure of NbTiAlCrSi alloy was observed by optical microscope, scanning electron microscope and energy dispersive spectroscopy. The results show that the alloy is composed of (Nb, Ti) 5Si3 and (Nb, X) SS phases (X stands for Ti, Al, Cr and other elements) . The homogenization annealing of alloy ingot at 1400 ℃ for 9h can not significantly change the size of (Nb, Ti) 5Si3 bar and block, but the second phase distribution of (Nb, Ti5) Si3 is changed from continuous bar to block Continuous (Nb, Ti) 5Si3 block. The alloy hot-rolled tensile strength of 704MPa, tensile brittle fracture at room temperature. The properties of M5Si3-type compounds and the presence of fine pores at the interface between the second phase and the matrix during the hot rolling cause brittleness of the alloy.