Sr变质对Al-6Si-3Cu-0.3Mg合金共晶Si形貌的影响  

Effect of Sr Modification on Eutectic Silicon Morphology in Al-6Si-3Cu-0.3Mg Alloy

作　　者：潘彦鹏[1] 张志峰[1] 李豹[1] 高明伟 徐骏[1] 

机构地区：[1]北京有色金属研究总院,国家有色金属复合材料工程技术研究中心

出　　处：《特种铸造及有色合金》2015年第3期321-324,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB606302);国家高技术研究发展计划(863计划)资助项目(2013AA031001);国家国际科技合作计划资助项目(2013DFA51370)

摘　　要：在660℃浇注Al-6Si-3Cu-0.3Mg合金试样,分别研究了添加0、0.005%、0.01%、0.02%、0.04%、0.06%的Sr对铸态合金中共晶Si形貌的影响,以及495℃×8h固溶+水淬+170℃×8h时效热处理对共晶Si圆整度的影响。结果表明,当Sr添加量为0.04%时可有效细化共晶Si组织,并在热处理后使得Si颗粒细小圆整,而当Sr添加量增大到0.06%时,分布在共晶组织周围的多边形含Sr化合物会明显增加,对合金性能起消极作用。Cast Al-6Si-3Cu-0.3Mg alloy was prepared by permanent mold at 660℃.Effects of 0~0.06%Sr modification on eutectic silicon morphology in as-cast and T6 treated alloy were investigated,and T6 treatment was conducted at 495℃for 8hours solid solution and water quenching and 170℃for 8hours aging.The results show that the eutectic silicon can be refined greatly with addition of 0.04%Sr,and the morphology of eutectic silicon is converted from long strip into dot or short bar under T6 condition.With the Sr content increasing to 0.06%,the volume of polygonal Sr-compounds can be increased around eutectic silicon phase,which has a negative effect on the alloy properties.

关 键 词：AL-SI-CU-MG合金 SR变质 T6热处理 共晶Si颗粒 

分 类 号：TG146.21[一般工业技术—材料科学与工程]