显微组织及性能
(1. 郑州大学 材料工程学院， 郑州 450002；
2. 上海交通大学 轻合金精密成型国家工程研究中心， 上海 200030)
摘 要: 研究了AlP对Mg2Si相及其基体组织的细化效果和机理。 结果表明： AlP能够作为Mg2Si初生相的异质核心，促使其由汉字形变为颗粒状， 并且促进τ（Mg32(Al, Zn)49）相的析出，而抑制φ（Al2Mg5Zn2）相的析出，同时基体组织也得到显著细化， 不仅改善了合金的室温性能， 而且也改善了高温（150℃）性能。
关键字: Mg-Zn-Al-Si合金；显微组织； AlP； 变质
（ 1. College of Materials Engineering, Zhengzhou University, Zhengzhou 450002, China；
2. State Engineering Research Center of Light Alloy Precision Shaping,Shanghai Jiaotong University, Shanghai 200030, China）
Abstract: The refining effect and mechanism of AlP on the microstructure of Mg-8Zn-4Al-1Si-0.3Mn alloy were studied.It shows that AlP addition promotes the formation of fine polygonal type Mg2Si particle by providing the nucleation sites and resulting in the precipitation of τ phase, but restrains the precipitation of φ phase. Moreover, the grain size of AlP modified Mg-Zn-Al-Si alloy is much finer than that of the based alloy, which results in the large enhancement in tensile properties at both ambient temperature and 150℃.
Key words: Mg-Zn-Al-Si alloy; microstructure; AlP; metamorphosis
