铝钛硼中间合金对A356合金组织遗传效应研究

Study on Microstructure Heredity Effects of Al-Ti-B Master Alloy on A356 Alloy

在相同条件下配制不同Ti含量的A356合金,通过对其晶粒度和二次枝晶臂间距统计,研究了不同组织状态的铝钛硼中间合金对A356合金细化效果的影响。结果表明,随着Ti含量的增加,A356合金的晶粒度逐渐增大,并逐渐趋于稳定;随着Ti含量的增加二次枝晶臂间距先减小后增大。A356合金成分相同时,使用的铝钛硼合金孕育处理的TlAl3相尺寸越小,细化效果好,表明铝钛硼中间合金对A356合金组织存在明显的遗传性特征。

A356 alloy with different Ti content was prepared under the same condition.The influence of Al-Ti-B intermediate alloy with different microstructure on the refinement effect of A356 alloy was studied by the statistics of its grain size and secondary dendrite arm spacing.The results show that with the increase of Ti content,the grain size of A356 alloy gradually increases and becomes stable.With the increase of Ti content,the secondary dendritic arm spacing first decreases and then increases.With the same composition of A356 alloy,the smaller the TlAl3 phase grain size of Al-Ti-B alloy inoculation treatment,the better the refining effect,indicating that the Al-Ti-B intermediate alloy has obvious genetic characteristics on the microstructure of A356 alloy.