复合添加Zr,Cr,Pr对Al-Zn-Mg-Cu-Zr合金再结晶行为的影响  

Effects of combined addition of Zr, Cr and Pr on recrystallization behavior of Al-Zn-Mg-Cu-Zr alloys

作　　者：叶登峰[1] 陈康华[1] 方华婵[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2010年第2期179-185,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2005CB623704);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(50721003);国家科技支撑计划项目(2007BAE38B06)

摘　　要：采用铸锭冶金法制备Al-Zn-Mg-Cu-Zr合金和Al-Zn-Mg-Cu-Zr-Cr-Pr合金,再对其进行均匀化退火(460℃/24 h)、锻压、固溶处理—室温水淬及峰时效处理。用金相显微镜观察合金的显微组织,并测试其力学性能,研究复合添加Zr、Cr、Pr对Al-Zn-Mg-Cu超高强铝合金再结晶行为和力学性能的影响。结果表明,复合添加Zr、Cr和Pr可显著抑制Al-Zn-Mg-Cu合金在锻压后回复过程中的亚晶合并长大,使该合金在较高温度(490℃)以及高温长时保温(480℃固溶4 h)情况下仍能保持细小的亚晶组织,从而提高合金的力学性能。复合添加Zr、Cr、Pr能使合金在490℃固溶1 h后在T6状态下的抗拉强度提高约25 MPa、屈服强度提高近30 MPa。The Al-Zn-Mg-Cu-Zr and Al-Zn-Mg-Cu-Zr-Cr-Pr super-high strength aluminum alloy have been fabricated by ingot metallurgy method.After treatments including annealing（460 ℃/24 h）,forging,solution hardening and ageing have been taken,effects of composite addition of Zr,Cr and Pr on recrystallization behavior of the super-high strength aluminum alloys were investigated by optical microscopy,hardness and tensile tests in different isothermal temperature and the same isothermal temperature different isothermal time.The results show that the composite additions of Zr,Cr and Pr in Al-Zn-Mg-Cu alloys can effectively retard the growth and mergence of the sub-grain during recovery after forging,maintaining a small sub-crystal structure at higher temperature and long-term holding of high-temperature,which enhance the mechanical properties of the alloys.When solution at 490 ℃ for 1 h of T6-tempered,the tensile strength and yield strength of the alloys can be increased about 25 MPa and 30 MPa,respectively.

关 键 词：AL-ZN-MG-CU合金 锆 铬 镨 再结晶 显微组织 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]