强磁场对Al-7％Si合金凝固过程中初生α-Al枝晶分布的影响

材料导报, 2016, 30(2): 90-94. doi: 10.11896/j.issn.1005-023X.2016.02.021

强磁场对Al-7％Si合金凝固过程中初生α-Al枝晶分布的影响

王长久 ^1, , 董蒙 ^2, , 刘铁 ^3, , 高鹏飞 ^4, , 牛书秀 ^5, , 苑轶 ^6,

1.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

2.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

3.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

4.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

5.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

6.东北大学材料电磁过程研究教育部重点实验室,沈阳,110004

基金项目: 中央高校基本科研业务费项目(N130302005) 国家自然科学基金(51271056)

关键词：强磁场 , Al-Si合金 , 凝固 , 枝晶

Effects of High Magnetic Fields on the Distribution of Primary α-Al Dendrites of Al-7％Si Alloys During Solidification

Keywords： high magnetic fields , Al-Si alloys , solidification , dendrites

采用超导强磁场装置研究了磁场强度对有、无细化剂颗粒Al-7％Si(质量分数)合金凝固组织的作用效果.研究发现,施加强磁场使无细化剂颗粒合金中的初生α-Al枝晶转变为发达枝晶形貌,二次枝晶生长充分,三次枝晶分支明显,枝晶尖端清晰可见;晶粒细化,且枝晶主轴与磁场方向呈30°规则排列.施加强磁场后初生α-Al枝晶数量和Si在α-Al中的溶解度都有少量增加.强磁场抑制添加细化剂合金熔体中的对流,加剧了Ti的重力偏析,使初生α-Al相出现明显枝晶化趋势,方向性增强,枝晶臂粗化明显.

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