Al-5Ti-B和稀土Y复合添加对A356合金半固态凝固组织的影响  

Effect of Compound Additive Al-5Ti-B and Y on Solidification Microstructure of Semi-Solid A356 Aluminum Alloy

作　　者：胡咏梅[1] 刘政[2] 

机构地区：[1]江西理工大学工程研究院,江西赣州341000 [2]江西理工大学机电工程学院,江西赣州341000

出　　处：《铸造》2011年第9期869-874,共6页Foundry

基　　金：江西理工大学校级课题(JXXJ10085);江西省自然科学基金项目资助(0650047);江西省教育厅科技项目(GJJ09229)

摘　　要：采用稀土Y及Al-5Ti-B中间合金对A356铝合金进行细化处理,并用低温浇注技术制备半固态坯料。研究了单独添加Al-5Ti-B和稀土Y以及两者复合添加时对A356铝合金半固态凝固组织的影响。研究结果表明,Al-5Ti-B和稀土Y对A356铝合金半固态初生相的形貌及尺寸均有不同程度的改善。将两者复合添加时,可显著提高合金中初生相的形貌及尺寸,得到细小、圆整且分布均匀的半固态组织,其添加量的最佳组合为0.02%的Ti与0.5%的Y。探讨了两者复合添加对合金凝固组织的细化机理。Semi-solid blank of A356 aluminum alloy was manufactured by low temperature pouring after grain-refined by master alloy Al-5Ti-B and rare earth Y. The effects of Al-5Ti-B, Y and the compound additive （Al-5Ti-B＋rare earth Y） on the solidification microstructure of semi-solid A356 Al alloy were researched. The results indicate that adding Al-5Ti-B or rare earth Y can improve both the grain size and morphology of primary phase of semi-solid A356, and adding the compound of Al-5Ti-B and Y can markedly improve the grain size and morphology of primary phase of the semi-solid A356 Al alloy, and the fine, round and uniform semi-solid structure can be obtained. The best content is 0.02% Ti and 0.5% Y. Finally, the refining mechanism of compound additive of Al-5Ti-B and Y on the grain size of the primary phase of semi-solid A356 Al alloy was discussed.

关 键 词：Al-5Ti-B 稀土Y A356铝合金 半固态 低温浇注 细化机理 

分 类 号：TG146.21[一般工业技术—材料科学与工程]