采用Gleeble3500热模拟试验机进行热压缩试验,研究了经热等静压(HIP)致密化的喷射成形Al-10.8Zn-2.8Mg-1.9Cu-0.12Zr铝合金锭坯的流变应力行为.采用线性拟合的方法建立了合金的本构方程与热加工图,利用背散射电子衍射技术(EBSD)表征了变形条件下热压样品的微观组织.结果表明,喷射成形铝合金具有较高的变形激活能,但加工性相对较差,合适的加工温度为380～ 405℃,应变速率不宜超过0.5s-1;变形温度和应变速率对合金的流变应力有非常显著的影响,合金峰值应力随变形温度的升高而降低,随应变速率的增加而增加;高应变速率和较低温度有利于形成并保留更多的亚晶结构.
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