Mg_2Si含量对过共晶Al-Si复合材料组织及性能的影响  

Effects of Mg_2Si Contents on Microstructure and Properties of Mg_2Si Particle Reinforced Hypereutectic Al-Si Alloy Composites

作　　者：刘政[1] 刘小梅[1] 陈明[2] 谢敏[2] 

机构地区：[1]江西理工大学机电工程学院 [2]江西理工大学材料与化学工程学院

出　　处：《特种铸造及有色合金》2011年第10期899-903,共5页Special Casting & Nonferrous Alloys

基　　金：江西省教育厅科技重点项目资助(GJJ11021)

摘　　要：用直接熔体反应法制备了Mg2Si增强过共晶Al-Si合金复合材料,研究了Mg2Si含量对复合材料的凝固组织和性能的影响。结果表明,Mg2Si的形貌随着其含量的增加而明显变化,由多边形块状向颗粒状转变,最终转变成粗大的树枝状。复合材料的硬度和耐磨性能与初生Mg2Si相的形态和数量有一定关系。Mg2Si particle reinforced hypereutectic Al-Si alloy composites were prepared by direct melt reaction,and the effects of Mg2Si content on the microstructure and properties of the composites were investigated. The results show that the Mg2Si morphology in the composites is obviously changed with increasing in its content,which is transformed from polygonal block structure into the particle,and then into the coarse dendrite. The hardness and wear resistance of the composites exhibit the distinct relationship with the morphology and amounts of Mg2Si phase.

关 键 词：过共晶AL-SI合金 MG2SI 复合材料 凝固组织 耐磨性能 

分 类 号：TB33[一般工业技术—材料科学与工程]