研究了不同稀土元素(RE)添加量对Al-10Sr中间合金组织的影响以及新型Al-10Sr-RE中间合金在Al-Si中的应用.结果表明:在Al-10Sr中间合金的基础上添加稀土(RE)元素能明显改善Al-10Sr中Al4Sr相的形貌,即随着RE含量增加,Al4Sr的形貌由针状向块状转变,当RE添加量达到4％(质量分数)时,Al4Sr相完全成为块状.最佳RE添加量为4％,由此成功制备出了Al-10Sv4RE中间合金变质剂.对Al-20Si合金的实际应用表明,初晶硅晶粒尺寸分布趋于均匀,晶粒较普通Al-10Sr变质剂减小1倍.
The effect of RE elements on microstructure of Al-10Sr master alloy and the application in Al-20Si alloy casting was investigated.The results reveal that the morphology of Al4Sr phase on Al-10Sr alloy can be changed obviously by adding RE elements to the Al-10Sr master alloy.The morphology of the Al4Sr phase on Al-10Sr master alloy changes from acicular shape to small blocks with the RE addition increasing to 4.0 wt％.The best additive amount of RE is 4.0 wt％.As a result,Al-10Sr-4RE master alloy alterant have prepared successfully.After RE addition,the primary silicon distribution on Al-20Si alloy becomes more homogeneous and its grain size decreased to half a time than other Al-10Sr alterant.
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