Sr-Ca复合变质对A390铝合金微观组织的影响（英文）  

Synergistic Effect of Sr and Ca Combined Additions on the Microstructure of A390 Aluminum Alloy

作　　者：张佳虹[1] 邢书明[1] 韩青有 郭强 王如芬 Zhang Jiahong;Xing Shuming;Han Qingyou;Guo Qiang;Wang Rufen(Beijing Jiaotong University,Beijing 100044,China;Purdue Universi Indiana 47907,American;Tianjin Lizhong Alloy Group Company Limited,Tianjin 300457,China)

机构地区：[1]北京交通大学,北京100044 [2]普渡大学,美国印第安纳州47907 [3]天津立中合金集团有限公司,天津300457

出　　处：《稀有金属材料与工程》2018年第11期3301-3308,共8页Rare Metal Materials and Engineering

基　　金：International S&T Cooperation Program of China(2014DFA53050)

摘　　要：研究了Sr-Ca复合变质对A390铝合金显微组织中初生硅相、共晶硅相、初生α相和金属间化合物相数量、尺寸和形貌变化的影响规律。结果表明,Sr-Ca复合变质体现为协同作用,少量Ca的加入不仅减缓了Sr在熔体中的烧损,降低了Sr烧损率,而且抑制了Sr对初生硅相的粗化作用。在A390铝合金中Sr的主要作用是变质共晶硅相和细化θ相,Ca的主要作用是变质初生硅相和初生α相。当联合添加质量分数0.05%Sr-Ca且Sr、Ca原子比为5:1时,获得了最佳组织形态,其中初生硅相、共晶硅相、初生α相均较0.05%Sr单独变质时有明显改善。Effects of Sr and Ca combined additions(Sr+Ca=0.05 wt/%) on the microstructure of A390 aluminum alloy were evaluated by investigating the variation of quantity,size and shape of primary silicon,eutectic silicon,primary α phase and intermetallic phase.The results show that the variation of microstructures results from the synergistic effect of Sr-Ca additions.The loss rate of Sr is reduced with a small amount of Ca;meanwhile,the coarsening effect of primary silicon phase arising from Sr addition is also suppressed.The Sr in A390 aluminum alloy mainly modifies eutectic silicon phase and refines θ phase.Furthermore,Ca principally modifies primary silicon phase and primary α phase.The optimal microstructure is obtained when combined addition of 0.05%Sr-Ca is applied and the atomic ratio of Sr and Ca is 5:1,in which primary silicon phase and eutectic silicon phase as well as primary α phase are all modified significantly compared with those of only 0.05% Sr addition.

关 键 词：AL-SI合金 变质 晶粒细化:微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]