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OALib Journal期刊
ISSN: 2333-9721
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感应加热连续退火对铜包铝复合线材再结晶组织和界面金属间化合物的影响
DOI: 10.3724/SP.J.1037.2013.00580, PP. 479-488
Keywords: 铜包铝复合线材,感应加热退火,再结晶,金属间化合物
Abstract:
研究了在250~470℃下感应加热连续退火对冷拉拔铜包铝复合线材包覆Cu层和Al芯组织、界面层金属间化合物组成和厚度的影响,并与传统炉式等温退火的实验结果进行了比较.结果表明当感应加热温度为250℃时,Cu层和Al芯只发生回复现象;Cu层和Al芯分别在300和330℃时开始发生再结晶,在430℃时均发生完全再结晶,平均晶粒尺寸分别约为6.0和7.3μm.当温度为360℃时,Cu/Al界面形成了不连续分布的CuAl2金属间化合物;当温度为390℃时,界面形成了连续分布的CuAl2层,430℃时形成了CuAl2和Cu9Al42种化合物层,平均厚度分别约为0.52和0.48μm.进一步升高温度,Cu层和Al芯的晶粒明显长大,界面化合物层厚度呈增大趋势.在本工作实验条件下,冷拉拔铜包铝复合线材合理的感应加热连续退火温度为430℃.与炉式等温退火工艺相比,感应加热连续退火方法可明显细化铜包铝复合线材Cu层和Al芯的再结晶晶粒,显著减小界面金属间化合物层厚度.
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