Al-30Cu-3P中间合金组织及其对Al-20Si合金的变质效果

Solidification Structure and Modification Effect of Al-30Cu-3P Master Alloy on Al-20Si Alloy

采用熔体混合法制备Al-30Cu-3P中间合金,研究了熔体混合情况下制备的Al-30Cu-3P中间合金凝固组织的演变及其对Al-20Si合金的变质效果。结果表明,Al-30Cu-3P中间合金组织由初生α-Al+(α-Al+CuAl2)共晶+AlP组成。随着熔体搅拌时间延长,Al-30Cu-3P合金的组织中,初生α-Al相数量逐渐减少,AlP数量逐渐增多,尺寸逐渐增大。熔体搅拌时间为20 min时制备的Al-30Cu-3P中间合金中形成的AlP尺寸最小,将其加入到Al-20Si合金中进行变质,初生Si的尺寸由61.36μm细化到20.24μm。

Al-30Cu-3P master alloy was prepared by melt mixing method.The evolution of the solidification microstructure in Al-30Cu-3P master alloy and its modification effect on Al-20 Si alloy were expounded.The results indicate that the solidification microstructures in Al-30Cu-3P master alloy is composed of primaryα-Al phase,eutectic(α-Al+CuAl2)and AlP.With increasing in stirring time,the number of primaryα-Al phases in the Al-30Cu-3P master alloy is reduced gradually,while the quantity of AlP is increased gradually with coarseness of size.The AlP presents the smallest size in the Al-30Cu-3P master alloy prepared by the melt stirring time for 20 min.The size of the primary silicon in Al-20 Si alloy is refined from 61.36μm to 20.24μm with the Al-30Cu-3P master alloy modification.