Mg元素对Al-4.4Cu-0.15Zr合金热裂性能的影响  

Effect of Mg Addition on Hot Tearing Properties of Al-4.4Cu-0.15Zr Alloy

作　　者：田宇 袁晓光[1] 黄宏军[1] 左晓姣[1] 郑文涛[1] TIAN Yu;YUAN Xiao-guang;HUANG Hong-jun;ZUO Xiao-jiao;ZHENG Wen-tao(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造》2020年第3期246-253,共8页Foundry

基　　金：国家自然基金面上项目(51875365)。

摘　　要：为了探究Mg元素加入量对铝铜合金热裂的影响规律,采用热裂敏感系数Hsc对合金热裂倾向与Mg元素加入量关系进行了表征。通过OM、XRD、SEM、TEM等检测手段,分析了Mg元素加入量对Al-4.4Cu-0.15Zr-x Mg(x=1.0、1.5、1.7、2.0、2.2、2.5,wt%)合金热裂敏感性的影响。结果表明,随着Mg元素加入量的增多,晶粒先细化后粗化,晶间低熔点相逐渐增多,合金的热裂倾向先降低后增加;当Mg元素添加量为1.7%时,合金抗热裂性最好,热裂敏感系数为1.16,此时合金晶粒最均匀细小,晶粒间的低熔点相几乎形成连续网状分布。Mg元素通过细化合金晶粒、增加晶间低熔点相体积分数以及改变其分布对合金热裂倾向发生作用。In order to investigate the effect of Mg addition on hot tearing of Al-Cu alloys,the relationship between hot tearing tendency and Mg addition was characterized by hot tearing sensitivity coefficient Hsc.The effects of Mg addition on hot tearing susceptibility of Al-4.4Cu-0.15Zr-xMg(x=1.0,1.5,1.7,2.0,2.2,2.5,wt%)alloys were investigated by OM,XRD,SEM and TEM.The results show that with an increasing in Mg content,the grains refine first and then coarsen,the intergranular low melting point phase increases gradually,and the hot tearing inclination decreases first and then increases.When Mg content is 1.7%,the alloy has the best hot crack resistance,and the hot crack sensitivity coefficient is 1.16.At this time,the alloy grains are the most uniform and fine,and the low melting point phase particles between grains almost form a continuous network distribution.The effect of Mg on hot tearing tendency of Al-4.4Cu-0.15Zr alloy is realized through refining grain size,increasing volume fraction of intergranular low melting point phase and changing their distribution.

关 键 词：铝铜合金 热裂敏感系数 Mg元素 显微组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]