顯微組織及性能
(1. 鄭州大學 材料工程學院， 鄭州 450002；
2. 上海交通大學 輕合金精密成型國家工程研究中心， 上海 200030)
摘 要: 研究了AlP對Mg2Si相及其基體組織的細化效果和機理。 結(jié)果表明： AlP能夠作為Mg2Si初生相的異質(zhì)核心，促使其由漢字形變?yōu)轭w粒狀， 并且促進τ（Mg32(Al, Zn)49）相的析出，而抑制φ（Al2Mg5Zn2）相的析出，同時基體組織也得到顯著細化， 不僅改善了合金的室溫性能， 而且也改善了高溫（150℃）性能。
關(guān)鍵字: Mg-Zn-Al-Si合金；顯微組織； AlP； 變質(zhì)
（ 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
