(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 湖南人文科技學(xué)院 材料工程系，婁底 417000)
摘 要: 通過力學(xué)、抗腐蝕等性能測試，XRD、透射電鏡等微觀組織分析，研究了一種基于固溶熱軋連續(xù)處理的新型熱機(jī)械處理對7050鋁合金微觀組織與性能的影響規(guī)律。結(jié)果表明：通過新型熱機(jī)械處理后的鋁合金在保證良好塑性的同時，強(qiáng)度顯著提高，最高屈服與抗拉強(qiáng)度分別達(dá)608.10 MPa 和651.24 MPa，較T6態(tài)的分別提高了82 MPa和51 MPa；其電導(dǎo)率介于T6與RRA狀態(tài)的電導(dǎo)率之間，其抗晶間腐蝕性能優(yōu)于T6態(tài)的而接近于RRA態(tài)的。鋁合金綜合性能的改善，是新型熱機(jī)械處理過程所形成的位錯組態(tài)及晶界析出相形態(tài)分布所致。
關(guān)鍵字: 鋁合金；熱機(jī)械處理；晶間腐蝕；電導(dǎo)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
