The severe plastic deformation of aluminum alloys can be advantageous for developing a unique microstructure by inducing dynamic recovery and dynamic precipitation. Because dynamic recovery and precipitation are related to temperature changes, an elevated temperature atmosphere during severe plastic deformation may accelerate microstructural changes in aluminum, resulting in different properties compared to that of the room-temperature processed sample. In the present work, the microstructural and mechanical properties of the elevated temperature high-pressure torsion-processed Al7075 alloy were investigated. Experimental results demonstrated that the elevated temperature during high-pressure torsion not only induces a dynamic recovery at a high shear strain regime but also yields coarse Mg, Zn, and Cu-rich precipitates in the aluminum matrix. Although the grain growth occurs from the shear strain of 7.8, evolved precipitates represents larger strength than matrix that result into continuous mechanical properties enhancement in the elevated temperature-processed sample. This result indicates that solute migration acceleration at an elevated temperature could be a suitable method to enhance the mechanical properties of aluminum alloys undergoing severe plastic deformation processing.

铝合金的剧烈塑性变形通过诱导动态恢复和动态析出，有利于形成独特的微观结构。由于动态恢复和沉淀与温度变化有关，因此在剧烈塑性变形过程中的高温气氛可能会加速铝的微观结构变化，导致与室温处理样品相比具有不同的性能。在本工作中，研究了高温高压扭转加工的 Al7075 合金的显微组织和力学性能。实验结果表明，高压扭转过程中的高温不仅会导致高剪切应变状态下的动态恢复，而且还会在铝基体中产生粗大的富含 Mg、Zn 和 Cu 的沉淀物。尽管晶粒生长是由 7.8 的剪切应变引起的，但演化出的沉淀物比基质具有更大的强度，从而导致高温处理样品的机械性能持续增强。该结果表明，在高温下加速溶质迁移可能是提高经历严重塑性变形加工的铝合金力学性能的合适方法。