中文摘要：

采用单辊搅拌冷却技术（Shearing—Cooling-Rolling，简称SCR）和在线固溶处理方法制备了Al-1．5Mg-0．3Sc（wt％）合金线材，研究了不同在线固溶温度条件下时效处理对合金线材的微观组织和拉伸性能的影响．结果表明：SCR技术对合金线材具有剪切细化功能，在铝基体内产生大量位错，时效析出大量Al3Sc强化相粒子，与位错交互作用．随着在线固溶温度下降，合金线材时效析出沉淀相Al3Sc的弥散度增加，合金线材的抗拉强度和延伸率提高；随着过时效时间的延长，合金线材的抗拉强度下降，线材的延伸率提高，时效8h，延伸率达峰值．

英文摘要：

Al-1.5Mg-0.3Sc alloy wires were prepared by SCR process and on-line solution, the effects of aging treatment on the microstructure, tensile property of the alloy wires formed by shearingcooling-rolling （SCR） under different on-line solution temperature were studied. The results show that the grain of the alloy wires is very fine, Al3Sc dispersoids precipitating from the supersaturated solid solution in the heating process can effectively pin dislocation .As the on-line solution temperature decrease, the degree of dispersion of precipitated phase （Al3Sc） increase, while the tensile strength and elongation of the alloy increase. However, the tensile strength decrease under over-aging, but the elongation still increase with the increase of aging time. The elongation can be up to peak value at aging 8 h.