镍和锰对Al-Si-Cu-Mg合金凝固组织及时效硬化的影响

来源期刊：中国有色金属学报2000年第z1期

论文作者：王金国 周宏 大成桂作 姜孝京

文章页码：168 - 172

关键词：铝合金； 凝固过程； 时效硬化

Key words：aluminum alloy； solidification process； aging hardening

摘    要：采用DSC差热分析及急冷试验方法并辅以微区成分分析 ,探讨了Ni和Mn对Al-Si-Cu-Mg四元合金凝固组织、凝固过程及时效硬化特性的影响。Ni的加入量达 4%以上时 ,在组织中将形成初晶型Al-Ni-Cu三元化合物和共晶型Al-Ni-Cu三元化合物 ,若同时添加Mn ,则还会结晶出共晶型的Al-Si-Cu-Ni-Mn五元化合物 ;Ni和Mn的加入可以加快Al-Si-Cu-Mg合金的时效硬化速度 ,同时又可推迟过时效现象的出现 ,有利于合金耐热性的提高。

Abstract: Differential scanning calorimetry(DSC), electron probe microanalysis(EPMA) and rapid solidification were adopted to study the effects of Ni and Mn on the microstructure, solidification process and aging hardening characteristics of Al-Si-Cu-Mg alloy. The results show that while the content of Ni is more than 4%, the primary crystal Al-Ni-Cu and eutectic Al Ni Cu compounds will appear. If Mn is added at the same time, the Al-Si-Cu-Ni-Mn compound will appear. Ni and Mn can not only quicken the aging hardening speed of Al-Si-Cu-Mg alloy but also delay the phenomenon of over aging. It is beneficial to improving the heat resistance of the alloy.