(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 湖南人文科技学院 材料工程系，娄底 417000)
摘 要: 通过力学、抗腐蚀等性能测试，XRD、透射电镜等微观组织分析，研究了一种基于固溶热轧连续处理的新型热机械处理对7050铝合金微观组织与性能的影响规律。结果表明：通过新型热机械处理后的铝合金在保证良好塑性的同时，强度显著提高，最高屈服与抗拉强度分别达608.10 MPa 和651.24 MPa，较T6态的分别提高了82 MPa和51 MPa；其电导率介于T6与RRA状态的电导率之间，其抗晶间腐蚀性能优于T6态的而接近于RRA态的。铝合金综合性能的改善，是新型热机械处理过程所形成的位错组态及晶界析出相形态分布所致。
关键字: 铝合金；热机械处理；晶间腐蚀；电导率
（1.School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Materials Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China）
Abstract:A novel thermo-mechanical treatment (TMT) based on solid solution-hot roll treatment(SSHR) and its influence on properties of 7050 alloy were studied by tensile and corrosion resistance testing. The influence on microstructure was studied by methods such as XRD and transmission electron microscope observation. The results indicate that the strength of 7050 alloy is enhanced by the novel TMT, meanwhile, a good plasticity remains. The highest yield strength and ultimate tensile strength reach 608.10 MPa and 651.24 MPa, respectively. They are increased by 82 MPa and 51 MPa, comparing with the yield strength and ultimate tensile strength of T6. The conductivities of TMT sample are between T6 and RRA, and the intergranular corrosion resistance is better than that of T6, and close to that of RRA. The results of microstructure analysis indicate that the comprehensive properties of 7050 alloy is promoted by the configuration of dislocations formed during TMT and the shape and distribution of grain boundary precipitates.
Key words: aluminum alloy; thermo-mechanical treatment; intergranular corrosion; conductivities
