(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 利用硬度检测和透射电镜观察研究含θ″析出相的Al-Cu合金在不同加工温度下多向压缩(MAC)变形后的组织。结果表明：温度大于60 ℃的加工能显著提高合金的加工性能；经60 ℃和70 ℃加工获得的亚晶组织稳定；而经100 ℃加工过程形成的细小亚晶出现合并长大现象。MAC加工15道次获得的组织分布极其不均匀，这种不均匀性与MAC变形方式密切相关；当加工道次提高到35次时，细晶组织基本分布均匀。对比分析表明试样经60 ℃MAC加工35道次后的组织状态最为理想。
关键字: Al-Cu合金；多向压缩变形；亚晶；剪切带
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:Al-Cu alloy containing θ″ precipitated phase was processed by multi-axial compression (MAC) deformation at various temperatures. The organization evolution was investigated by transmission electron microscopy and vickers hardness tester. The results show that the processing properties of the alloy can be significantly improved with processing temperature rising to 60 ℃. The subgrains obtained during processing at 60 and 70 ℃ are stable, and grow up as the temperature rising to 100 ℃. The uneven distribution of the microstructures of Al-Cu alloy processed by MAC with 15 passes is associated with the deformation pattern of MAC. This can be resolved through the increase of steps to 35 passes. Comparing microstructures of the different processing states, which shows that the microstructures processed during 60 ℃ with 35 passes is optimal.
Key words: Al-Cu alloy; multi-axial compression deformation; subgrain; shear band
