【摘要】 采用强力错距旋压技术在400℃(HS)和室温(RTS)条件下制备7075铝合金管材，并对其成形过程中的显微组织演变和力学性能变化进行研究。结果表明：经过旋压变形后，7075铝合金管材的晶粒明显细化，并且在400℃下厚度减薄60%和70%(HS-60%和HS-70%)的管材组织以变形组织为主，而厚度减薄85%(HS-85%)的管材组织以再结晶组织为主。此外，HS-85%管材由于动态再结晶和异常晶粒长大的出现，形成了具有弱立方织构的双峰晶粒组织。随着400℃下厚度减薄率从0%增加到85%，管材的屈服强度(YS)和极限抗拉强度(UTS)先增加后降低，而伸长率则先降低后增加。室温厚度减薄85%(RTS-85%)的管材的UTS和YS分别为613.5和567.9 MPa，与HS-85%管材相比，分别提高了33.7%和57.4%，但其伸长率仅为7.3%。更多还原

【Abstract】 The tubes of 7075 aluminum alloy were fabricated by power stagger spinning at 400 °C(HS) and room temperature(RTS), and then the microstructure evolution and mechanical properties were investigated. Results show that the grains after spinning are refined prominently, and the tubes after 60% and 70% thickness reduction(HS-60% and HS-70%) are dominated by the deformed structure, while the recrystallized structure is dominant in the tube after 85% thickness reduction at 400 °C(HS-85%). Furthermore, a bimodal grain structure with a weak Cube texture is obtained in the HS-85% sample due to the emergence of the dynamic recrystallization(DRX) and abnormal grain growth. As the thickness reduction increases from 0% to 85% during spinning at 400 °C, the yield strength(YS) and ultimate tensile strength(UTS) increase first and then decrease, while the elongation decreases first and then increases. Compared with that of the HS-85% sample, the UTS and YS of RTS-85% sample are 613.5 and 567.9 MPa, respectively, which are improved by 33.7% and 57.4%, while the elongation is only 7.3%.更多还原