P对原位合成20Mg_2Si/Al-Si复合材料组织与性能的影响  

Effects of P Element on Microstructure and Mechanical Properties of 20Mg_2Si/Al-Si Composites

作　　者：郭富强 陈冲[2] Guo Fuqiang Chen Chong(Zhengzhou University of Industrial Technology Zhengzhou Technical College)

机构地区：[1]郑州工业应用技术学院 [2]郑州职业技术学院

出　　处：《特种铸造及有色合金》2017年第9期998-1001,共4页Special Casting & Nonferrous Alloys

基　　金：郑州市科技局普通科技攻关资助项目(PKJGG151);河南省教育厅科学技术研究重点资助项目(14B430018)

摘　　要：采用原位反应法制备了20Mg_2Si/Al-Si复合材料,研究了P对该复合材料微观组织和力学性能的影响。结果发现,未添加P时,复合材料中的初生Mg_2Si相呈现出粗大的树枝晶和多边形块状;当加入P后,初生Mg_2Si相转变为细小的颗粒状,其实质是P与Al形成了AlP化合物,并充当了初生Mg_2Si相的异质形核核心。未变质时,复合材料的硬度(HB)和抗拉强度约为71.5和102.1 MPa,而加入P后,复合材料的硬度(HB)和抗拉强度分别增加至97.2和133.6 MPa。The effects of P on the microstructure and mechanical properties of 20Mg2Si/Al-Si composites fabricated by in situ reaction were investigated.The results show that the primary Mg2Si phase in the composites without P addition presents the feature of coars dendrite or polygonal block,while the primary Mg2Si phase is changed from dendrites to fine particles with the addition of P element,which is attributed to the elements Al and P forming a compound of AlP to be acted as heterogeneous nucleation sites.The hardness and tensile strength of the composites without P addition are 71.5 HB and 102.1MPa,respectively,while with adding P element,the hardness and tensile strength of the composites are increased to 97.2HB and 133.6 MPa,respectively.

关 键 词：初晶Mg2Si AL基复合材料 P变质 微观组织 力学性能 

分 类 号：TB33[一般工业技术—材料科学与工程]