P-Sb复合变质对Al-Si合金组织的影响  

Effect of P-Sb Compound Modification on Microstructure of Al-Si Alloy

作　　者：宗福春 葛素静 杜科选 张翠翠 王国俭 孙伟娜 

机构地区：[1]河北立中有色金属集团有限公司河北省轻金属合金材料工程技术研究中心

出　　处：《特种铸造及有色合金》2016年第7期762-764,共3页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA031001)

摘　　要：研究P变质、P-Sb复合变质、Mg含量对Al-Si合金组织及力学性能影响。结果表明,P变质后,初生Si尺寸由40μm减小至20μm,共晶Si长度由20μm减小至12μm,而且分布更均匀,抗拉强度、屈服强度均提高15%。P-Sb复合变质后,初生Si尺寸减小至5μm,共晶Si变为蠕虫状,α-Al枝晶得到细化,与P变质相比,抗拉强度、屈服强度均提高8%。Mg含量增多,激化Sb变质效果,共晶Si变为球体状,初生Si消失、α-Al枝晶更细小,与P-Sb复合变质相比,抗拉强度、屈服强度均提高3%。Effects of P modification, P-Sb compound modification and Mg content on microstructure of A1-Si alloy were investigated. The results show that the size of primary Si is decreased from 40μm to 20 vtm and the length of eutectic Si is decreased from 20 μm to 12 μm with more uniform distribution after P modification, so both tensile strength and yield strength of the P modified alloy are increased approxi- mately 15%. The size of primary Si is decreased to 5 μm, and dendrite size of a-A1 is obviously refined after P-Sb compound modification, meanwhile, the shape of eutectic Si appears wormlike, so tensile strength and yield strength of the alloy are increased about 8 % compared with those of the alloy with P modification. With the increase of Mg content, the Sb modification effect is promoted, where the shape of eutectic Si appears with absence of primary Si and refinement of dendrite size of a-A1, so tensile strength and yield strength of the alloy are increased about 3% compared with those of ones with P-Sb modification.

关 键 词：AL-SI合金 P-Sb复合变质 Mg含量 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]