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采用平衡合金法,利用X射线衍射、扫描电镜及能谱分析,系统地研究了Mg-Zn-Al三元系富镁角335°C的平衡相组成及其成分。从实验上证实,α-Mg固溶体并不与Mg32(Al,Zn)49(τ)三元金属间化合物或q准晶相平衡,而仅与一个三元化合物Al5Mg11Zn4(φ)相平衡。获得了φ相在335°C的整个成分范围,即:52.5%~56.4%Mg、13.6%~24.0%Al、19.6%~33.9%Zn(摩尔分数)。Al在Mg Zn相中的固溶度远大于在Mg7Zn3相中的固溶度,其最大值可达8.6%Al(摩尔分数)。Al和Zn可以同时固溶在α-Mg固溶体中。
The equilibrium phase composition and composition of Mg-Zn-Al ternary system at 335 ° C were systematically investigated by the equilibrium alloy method and X-ray diffraction, SEM and EDS. It has been experimentally confirmed that the α-Mg solid solution does not equilibrate with the Mg32 (Al, Zn) 49 (τ) ternary intermetallic compound or the q quasicrystal phase, but only with one ternary compound Al5Mg11Zn4 (φ). The entire composition range of the φ phase at 335 ° C was obtained, namely: 52.5% to 56.4% Mg, 13.6% to 24.0% Al, 19.6% to 33.9% Zn (mole fraction). The solid solubility of Al in the Mg-Zn phase is far greater than the solid solubility in the Mg7Zn3 phase, with a maximum of up to 8.6% Al (mole fraction). Al and Zn can be simultaneously dissolved in α-Mg solid solution.