研究了退火温度对冷静液挤压铜包铝线材组织和性能的影响规律,在界面断裂形式分析的基础上探讨了其作用机理.结果表明:直径为6 mm的冷静液挤压态铜包铝线材合理的退火温度为350℃.低于200℃退火时,纯Cu包覆层只发生回复,复合线材的力学性能得以部分恢复;350℃退火时,铜层再结晶基本完成,复合线材的抗拉强度降到最低,延伸率则达到最高;400℃退火时,铜层晶粒开始长大,复合线材的延伸率开始劣化.界面结合强度随温度的变化呈先增加后降低的趋势,而界面的断裂则由低温退火时的铝基体塑性断裂转变为高温退火后Cu/Al界面的脆性断裂.
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