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8 h,延伸率达峰值.
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