利用热分析仪研究Sr元素对A356.2铝合金的变质效果  

Study of Sr Modification Effect on A356.2 Aluminum Alloy by Thermal Analyzer

作　　者：杨海军 蔡振斌 刘志国 李广 YANG Hai-jun;CAI Zhen-bin;LIU Zhi-guo;LI Guang(Qinhuangdao Development Zone Meilv Alloy Co.,Ltd.,Qinhuangdao 066004,Hebei,China;Hebei Wheel New Material and Testing Technology Innovation Center,Qinhuangdao 066004,Hebei,China)

机构地区：[1]秦皇岛开发区美铝合金有限公司,河北秦皇岛066004 [2]河北车轮新材料与测试技术创新中心,河北秦皇岛066004

出　　处：《铸造》2021年第10期1196-1199,共4页Foundry

摘　　要：A356.2铝合金中加入不同含量的Sr元素对合金进行变质处理,利用热分析仪获得的特征值TSO可以得到合金变质前后共晶生长温度降低值△TSO。通过分析不同△TSO数值与合金的金相组织之间的对应关系,认为:当△TSO<3.9℃时,金相组织中显示硅变质不足;当3.9℃≤△TSO≤5.7℃时,金相组织中显示硅变质效果中等;当△TSO>5.7℃时,金相组织中显示硅变质效果良好。因此,可直接利用热分析仪分析结果,判断A356.2铝合金中硅元素的变质效果,用此方法可以省时省力。As different amounts of Sr elements are added to A356.2 aluminum alloy to modify the silicon phases in the alloy, the characteristic value TSO can be obtained by the thermal analyzer, so as to obtain the value △TSO which is the eutectic growth temperature reduction before and after modification. By analyzing the corresponding relationship between the metallographic structure of the alloy and the different △TSO values, it is found that when △TSO<3.9 ℃, the metallographic structure shows an insufficient silicon modification to the alloy;when 3.9 ℃ < △TSO<5.7 ℃, the metallographic structure shows a medium silicon modification effect;when △TSO>5.7 ℃, the metallographic structure shows a excellent silicon modification effect. Therefore, the analysis results of the thermal analyzer can be directly used to judge the modification effect of silicon for the A356.2 alloy. And this method can save time and labor.

关 键 词：热分析仪 A356.2铝合金 SR 变质 

分 类 号：TG146.21[一般工业技术—材料科学与工程]