OALib Journal期刊
准晶增强的Mg-Zn-Al-(Y)合金热压缩变形行为
DOI: 10.3724/SP.J.1037.2011.00372
Keywords: Mg-Zn-Al-(Y)合金 ,二十面体准晶 ,热压缩变形 ,动态再结晶
Abstract:
通过常规金属型铸造工艺制备准晶相增强的Mg-8Zn-4Al(ZA84)和Mg-8Zn-4Al-0.5Y(ZAY8405)合金,采用Gleeble-1500热模拟试验机在温度230℃和应变速率0.0015-1.5s-1的条件下,对准晶增强的Mg-Zn-Al-(Y)合金的热压缩变形行为进行了研究.结果表明ZA84和ZAY8405合金铸态组织主要由二十面体准晶和α-Mg所组成,Y的加入可进一步细化凝固过程中形成的准晶相;Mg-Zn-Al-(Y)合金热变形过程中合金发生典型的动态再结晶,流变应力随应变速率增大而增大,并可通过幂指数模型进行描述,应变速率变化对ZAY8405合金流变应力的影响更大;热变形过程中,准晶可促进Mg-Zn-Al-(Y)合金的动态再结晶,ZAY8405合金中弥散分布的细小准晶以及Y的加入更有利于孪生和动态再结晶的发生.
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