中南大学学报（自然科学版）2012，Vol.43Issue(3)：900-905,6.
等温自由锻温度对7085铝合金组织与性能的影响
Effects of isothermal free forging temperature on microstructure and properties of 7085 aluminum alloy
摘要
Abstract
The microstructure, mechanical and corrosion property of 7085 aluminum alloy deformed at different isothermal free forging temperatures were analyzed using optical microscope (OM), scanning electron microscope (SEM), mechanical tensile test and exfoliation corrosion. The experimental results show that serious recrystallization occurs at 370 ℃ or 400 ℃, resulting in the strength severely decreases, the elongation increases slightly and exfoliation corrosion gets worse. At 420 ℃, the alloy exhibits small and uniform sub-grain structure, leading to better strength, elongation and exfoliation resistance. The ultimate strength, yield strength and elongation achieve 533.2 MPa, 495 MPa and 13.3%, respectively. Exfoliation corrosion grade reaches EA. While the deformation temperature rises 450 ℃, the grains begin to grow up. The strength and exfoliation resistance decrease, but the elongation increases slightly. Considering the factors of microstructure, strength, plastic and exfoliation resistance, 420 ℃ is determined to be the best isothermal free forging temperature.关键词
7085铝合金/等温自由锻/再结晶/显微组织/力学性能/剥蚀抗力Key words
7085 aluminum alloy/ isothermal free forging/ recrystallization/ microstructure/ mechanical properties/ exfoliation resistance分类
矿业与冶金引用本文复制引用
梁信,陈康华,陈学海,陈送义,彭国胜..等温自由锻温度对7085铝合金组织与性能的影响[J].中南大学学报（自然科学版）,2012,43(3):900-905,6.基金项目
国家重点基础研究发展计划(“973”计划)项目(2012CB619502,2010CB731701) （“973”计划）
国家自然科学基金委员会创新研究群体科学基金资助项目(51021063) （51021063）
