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采用感应加热制备了Mg96.32Er2Zn1.5Zr0.18合金,对合金进行热处理,利用光学显微镜、扫描电镜背散射电子技术、能谱分析仪以及X射线衍射仪研究了合金不同状态的显微组织。结果表明:铸态Mg96.32Er2Zn1.5Zr0.18合金呈现树枝晶结构,相组成主要为α-Mg相、X相和W相;经过热处理后,合金的树枝晶组织得到完全消除,X相逐渐溶入基体中,合金晶粒尺寸没有发生明显的改变;热处理工艺为530℃×8 h时,合金的X相完全溶入基体中,W相的形态发生变化,由网状转变成谷粒状,同时热处理过程中还析出部分细小的谷粒状W相。
Mg96.32Er2Zn1.5Zr0.18 alloy was prepared by induction heating. The alloy was heat treated. The microstructure of the alloy was studied by optical microscope, scanning electron microscopy backscattering electron spectroscopy and X-ray diffraction. The results show that the dendritic structure of as-cast Mg96.32Er2Zn1.5Zr0.18 alloy is mainly composed of α-Mg phase, X-phase and W-phase. After heat treatment, the dendritic structure of the alloy is completely eliminated and X phase gradually dissolves When the heat treatment process is 530 ℃ × 8 h, the phase X of the alloy completely dissolves into the matrix, and the morphology of the W phase changes from mesh to grain, meanwhile, the grain size of the alloy does not change obviously. Heat treatment process also precipitated part of the small grain W phase.