Al-Sr中间合金变质对铝镁硅型材组织与性能的影响
Effect of Modification of Al-Sr Master Alloy on Microstructure and Properties of Al-Mg-Si Profile
金祥龙1， 郑秀媛2， 姜 锋2， 陈 伟1
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作者单位：1.浙江乐祥铝业有限公司， 浙江 绍兴 311800； 2.中南大学, 湖南 长沙 410083
中文关键字：Al-Mg-Si型材； Al-Sr中间合金； 微观组织； AlFeSi相
英文关键字：Al-Mg-Si profile; Al-Sr master alloy; microstructure; AlFeSi phase
中文摘要：采用金相显微镜，扫描电镜及能谱分析仪对Al-Sr中间合金对Al-Mg-Si合金的变质效果进行了对比研究。试验结果表明，添加Al-Sr变质剂对合金组织中所含的AlFeSi相起到了一定的变质作用，使该相呈鱼骨状，边缘圆钝化，内部应力集中减小，与基体间产生较强的界面连接，在保证力学性能的前提下，提高了型材的韧性和耐蚀性。
英文摘要：The effect of Al-Sr master alloy on the microstructure and mechanical properties were studied by optical OM, SEM and EDS. The results show that Al-Sr master alloy is able to modify AlFeSi phase. The AlFeSi phase existing in the modified alloy appears as herring shape in large size with round boundary, which can reduce the internal stress concentration and promote the connection with the matrix. The addition of strontium can significantly increase the toughness and corrosion resistance of Al-Mg-Si profile, which can also ensure the mechanical properties.