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中文摘要：
为解决Al-Si合金存在的Na变质重熔失效和有效时间短及P变质处理后初晶Si偏聚问题,利用施加强磁场的方法,分别对亚共晶Al-6%Si合金和共晶Al-12.6%Si合金进行Na盐变质处理,对过共晶Al-18%Si合金进行P盐变质处理.结果发现对于亚共晶Al-6%Si合金,施加强磁场的条件下重熔,Na变质没有失效;对于共晶Al-12.6%Si合金,施加强磁场延长了变质有效时间;对于过共晶Al-18%Si合金,施加强磁场使凝固组织中的初晶Si相均匀分布.强磁场有助于改善Al-Si合金的变质效果.
英文摘要：
Strong magnetic field method was adopted to solve the problems, such as the loss of efficiency after re-melt, the short effective time after Na modification, and the primary Si distributed unevenly after P modification. Al-6%Si hypoeutectic alloy and Al-12.6%Si eutectic alloy were modified with Na-salt, and Al-18 %Si hypereutectic alloy was modified with P-salt in strong magnetic field respectively. The experimental results show that for Al-6 % Si hypoeutectic alloy, the magnetic field can avoid the loss of efficiency, and for Al-12.6%Si eutectic alloy, the strong magnetic field can prolong the effective time of the modification. For Al-18%Si hypereutectic alloy, the primary Si distributes evenly when the strong magnetic field imposed. Experimental results also show that the strong magnetic field can improve the modification.
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