热处理工艺对单辊搅拌冷却成形Al-Mg-Sc合金组织和力学性能的影响  

Effects of heat treatment on microstructures and mechanical properties of Al-Mg-Sc alloy wire formed by shearing-cooling-rolling technology

作　　者：张雪飞[1] 周天国[1] 温景林[2] 

机构地区：[1]沈阳大学机械工程学院,沈阳110044 [2]东北大学材料与冶金学院,沈阳110004

出　　处：《中国有色金属学报》2010年第9期1686-1691,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金与上海宝钢集团联合资助项目(50274020)

摘　　要：采用单辊搅拌冷却技术(Shearing-cooling-rolling,简称SCR技术)和在线固溶处理方法制备Al-3Mg-0.5Sc合金线材,研究不同热处理工艺对合金线材的微观组织和力学性能的影响。结果表明:SCR技术对合金线材产生强烈的单辊剪切塑性变形,在铝基体中产生大量的位错及初生Al3Sc强化相粒子,初生Al3Sc强化相粒子与热处理过程中沉淀析出的大量更为细小的次生Al3Sc强化相粒子共同与位错交互作用。当合金线材采用T6(SCR成形、在线固溶并人工时效)热处理制度时,320℃时效2h后合金线材的抗拉强度为353MPa;当采用T8(SCR成形、在线固溶、冷拔加工并人工时效)热处理制度时,合金材料的抗拉强度为378MPa;当采用T9(SCR成形、在线固溶、人工时效并冷拔加工)热处理制度时,合金线材的抗拉强度为435MPa。Al-3Mg-0.5Sc alloys wires were prepared by shearing-cooling-rolling（SCR） and on-line solution,the effects of heat treatment on the microstructures and mechanical properties of those alloy wires formed by SCR were studied.The results show that primary Al3Sc and dislocation are formed in alloy wire by SCR deformation,and the finer secondary Al3Sc dispersoids precipitated from the supersaturated solution in the treatment can effectively pin dislocation.After T6（SCR forming,on-line solution,aging） treatment at 320 ℃ for 2 h,the tensile strength is 353 MPa.After T8（SCR forming,on-line solution,drawing,aging） treatment,the tensile strength is 378 MPa.After T9（SCR forming,on-line solution,aging,drawing） treatment,the tensile strength is 435 MPa.

关 键 词：AL-MG-SC合金 时效 单辊搅拌冷却(SCR) 力学性能 

分 类 号：TG355.12[金属学及工艺—金属压力加工] TG146.2[一般工业技术—材料科学与工程]