MgCO_3和Sr对原位Mg_2Si/AM60B复合材料的变质  

Modification of In-situ Mg_2Si/AM60B Magnesium Matrix Composites with MgCO_3 and Sr

作　　者：申乐[1] 陈体军[1] 马颖[1] 刘明伟[1] 郝远[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室

出　　处：《特种铸造及有色合金》2011年第7期653-655,共3页Special Casting & Nonferrous Alloys

摘　　要：研究了MgCO3、Sr对原位自生Mg2Si/AM60B复合材料中Mg2Si相及基体的复合变质作用。结果表明,微量Sr的加入可以明显改善Mg2Si相的形貌。初生Mg2Si由粗大的树枝状转为多角形状,共晶Mg2Si由粗大的汉字状变为弥散而细小的短棒状或多边形粒状。同时,MgCO3对AM60B基体也起到了很好的细化作用,从而使原位自生Mg2Si/AM60B复合材料的力学性能得到提高。Effects of compound modification of MgCO3 and Sr on AM60B and Mg2Si phase in in-situ Mg2Si/AM60B magnesium matrix composites were investigated. The results show that trace Sr addition can greatly improve the morphology of Mg2Si phase, where primary Mg2Si phase is converted from coarse dendrite into polygonal structure, and eutectic Mg2Si phase is transformed from coarse Chinese script into fine rod-like ones or polygonal particle. Meanwhile, MgCO3 can obviously refine the AM60B matrix. Based on the above effects, the mechanical properties of the in-situ Mg2Si/AM60B magnesium matrix composites were significantly improved.

关 键 词：原位自生Mg2Si AM60B镁合金 SR MGCO3 复合变质 

分 类 号：TB331[一般工业技术—材料科学与工程]