通过Gleeble热力模拟获得了7A04铝合金恒温和恒应变速率条件下的压缩应力-应变曲线,温度范围和应变速率范围分别为350～450℃和0.01～10s-1.在峰值应力的双曲正弦模型基础上,测定了7A04铝合金热变形激活能Q；并利用加工硬化率θ和Sellars模型结构,自主建立了7A04铝合金动态再结晶的临界应变本构模型.结果表明:由动态再结晶临界应变本构模型得到的结果与Gleeble热力模拟实验结果基本吻合,该本构模型可较准确地预测7A04铝合金热成形过程中的动态再结晶发生的临界点.
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