摘要
在A356铝合金中分别加入自制的Al-5Ti-0.5C、Al-10Sr和Al-5Ti-0.5C-8Sr三种中间合金,利用SEM以及EDS等手段研究了其对A356铝合金组织的影响。结果表明,添加w(Al-5Ti-0.5C)=0.5%的A356铝合金的晶粒尺寸由1 720μm减小到530μm左右,但针片状共晶硅形貌基本没变化;添加w(Al-10Sr)=0.4%的A356铝合金的晶粒尺寸减少至1 550μm,共晶硅由原来的针片状变成了细小的纤维状或颗粒状;当添加w(Al-5Ti-0.5C-8Sr)0.5%后,A356铝合金的晶粒尺寸减小至210μm,对共晶硅的变质效果与Al-10Sr的相当,Al-5Ti-0.5C-8Sr具有双重的细化和变质效果,没有出现Ti与Sr中毒现象。
Effects of Al-5Ti-0.5C、Al-10Sr and Al-5Ti-0.5C-8Sr on the structures of A356 alloy were investigated by SEM and EDS. The results show that the average grain size of A356 alloy decreased from 1 720μm to 530μm when the alloy was refined through the addition of 0.5% Al-5Ti-0.5C refiner alone, but the morphology of needle/plate like eutectic silicon was not changed obviously; the grain size of A356 alloy was reduced to 1 550 μm when the alloy was refined through the addition of 0.4% Al-10Sr modifier alone, and the morphology of euteetic silicon was total changed from needle/plate like to fibrous/globular like; After added 0.5% Al-5Ti-0.5C-8Sr master alloy, the grain size of A356 alloy was reduced to 210 μm, and the function of the master alloy on eutectic silicon is similar to that of Al-10Sr, so the Al-5Ti-0.5C-8Sr master alloy has the dual-purpose effects of grain refinement and eutectic silicon modification because that Ti and Sr have no mutual poisoning effect.
出处
《轻合金加工技术》
CAS
北大核心
2009年第10期27-30,共4页
Light Alloy Fabrication Technology
