La对原位自生Mg_2Si/Al复合材料组织及性能的影响  

Effect of La on Microstructure and Mechanical Properties of In-situ Mg_2Si/Al Alloy Composites

作　　者：刘政[1] 白光珠 徐丽娜[2] 余昭福 

机构地区：[1]江西理工大学机电工程学院 [2]江西理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2015年第9期897-901,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51361012);江西省自然科学基金资助项目(20114bab206014);江西省教育厅重点科技资助项目(GJJ11021)

摘　　要：采用重力铸造法制备了原位自生Mg2Si/Al复合材料,研究了稀土La处理的Mg2Si/Al基复合材料的组织形貌和力学性能。结果表明,稀土La对Mg2Si/Al复合材料的凝固组织有影响;添加稀土处理的Mg2Si/Al基复合材料中的Mg2Si颗粒变得更加细小,La与Al相互作用形成Al11La3相可阻止Mg2Si相长大;添加La之后,铸态Mg2Si/Al基复合材料的力学性能得到改善,其抗拉强度和伸长率分别为108 MPa和2.56%。In-situ Mg2Si/Al composites were prepared by common gravity casting. Microstructure and mechanical properties of Mg2Si/Al composites contained La were investigated by SEM （scanning electron microscopy） and OM （optical microscopy）, tensile testing. The results indicate that effects of La on the microstructure of Mg2Si/Al alloy composites can be observed, and Mg2Si particles treated by La in the composites is refiend which is attributed to Alia Las phase formed by interaction between La and Al inhibiting Mg2 Si phase growth. The mechanical properties of the composites with La addition can be improved, where the maximum tensile strength and elongation of the composites reach 108 MPa and 2.56% , respectively.

关 键 词：MG2SI 复合材料 稀土 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程] TG249[金属学及工艺—铸造]