组织和力学性能的影响
(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)
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2 h后合金线材的抗拉强度为353 MPa；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378 MPa；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435 MPa。
关键字: Al-Mg-Sc合金；时效；单辊搅拌冷却(SCR)；力学性能
mechanical properties of Al-Mg-Sc alloy wire formed by shearing-cooling-rolling technology
（1. School of Mechanical Engineering, Shenyang University, Shenyang 110044, China;
(2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: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.
Key words: Al-Mg-Sc alloy; aging; shearing-cooling-rolling (SCR); mechanical property
