Si对原位自生Mg_2Si/AM60复合材料组织及性能的影响  

Effects of Si on Microstructure and Properties of in Situ Synthesized Mg_2Si/AM60 Composites

作　　者：胡勇[1] 闫洪[1] 陈国香[1] 梅楹煜[1] 

机构地区：[1]南昌大学,江西南昌330031

出　　处：《稀有金属材料与工程》2009年第2期343-347,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50465003;50765005);江西省科技厅和江西省教育厅资助项目

摘　　要：采用原位合成技术制备Mg2Si/AM60复合材料,研究不同Si含量对其组织及性能的影响。结果表明:镁合金中加入结晶Si后,出现短棒状及中国汉字状的Mg2Si相;当Si含量较高时,中国汉字状的Mg2Si相消失,变成不规则的块状。制备过程中对复合材料进行机械搅拌,Mg2Si相的分布较未搅拌更加均匀、弥散。复合材料的抗拉强度、硬度随Si含量的增加呈上升趋势,延伸率则下降。当Si量为1.0%(质量分数,下同)时,强度较基体提高12%,含量为5%时,硬度较基体提高48.6%。Mg2Si/AM60 composites were fabricated by in situ synthesis, and their microstructures and properties were investigated for the composites adding different Si contents. The results indicate that some fine Mg2Si particles of cosh shape and chinese script shape appeared in the microstructure by adding crystal Si, but were changed to irregular bulks when the content of Si is high. The composites with more homogeneous distribution of Mg2Si particles were produced by mechanical stirring. The ultimate tensile strength and hardness of composites were increased with the increase of Si, but the elongation was reduced. The ultimate tensile strength increased by 12 % for 1.0 % Si addition and the hardness increased by 48.6 % for 5 % Si addition.

关 键 词：原位自生 MG2SI 复合材料 显微组织 力学性能 

分 类 号：TG132[一般工业技术—材料科学与工程]