一种新型Al-Zn-Mg-Cu-Zr合金的变形行为研究

Investigation on Deformation Behavior of a New Type Al-Zn-Mg-Cu-Zr Alloy

通过动态镦粗压缩实验的方法研究了一种新型Al-Zn-Mg-Cu-Zr合金的变形行为。结果表明:Al-Zn-Mg-Cu-Zr合金在350℃以下变形时,由于变形温度较低,在变形过程中发生动态析出行为,合金晶内析出细小沉淀相,对合金的进一步变形不利;当变形温度高于400℃时,合金没有出现动态析出行为;当变形温度继续升高到450℃时,合金出现了动态再结晶和晶粒长大现象。所以,该Al-Zn-Mg-Cu-Zr合金的最佳变形温度为400～420℃,极限变形量为60%。

Deformation behavior of a new AI-Zn-Mg-Cu-Zr alloy is investigated by dynamic upsetting compress test. The results show that, when the deformation temperature of A1-Zn-Mg-Cu-Zr alloy is below 350℃, there is dynamic precipitation behavior during deformation because of low temperature. Further deformation of the alloy will be difficult due to small precipitates in the alloy. When the de- formation temperature is above 400℃, there is no dynamic precipitation behavior in the alloy. When the deformation temperature is higher than 450℃, there is dynamic recrystallization and size increase of grain. The results of dynamic upsetting test show that the appropriate forging temperature of A1- Zn-Mg-Cu-Zr alloy is range of 400-420℃, and the maximum deformation is 60%.