Nd对Mg_2Si/Al复合材料干滑动摩擦磨损行为的影响  

Influence of Nd Addition on Microstructure and Dry Sliding Wear Behaviors of in situ Mg_2Si/Al Composites

作　　者：王孝良[1] 武晓峰[1] 

机构地区：[1]辽宁工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2013年第4期361-364,共4页Special Casting & Nonferrous Alloys

基　　金：辽宁省教育厅重点实验室资助项目(20060394)

摘　　要：考察了Nd对原位自生Mg2Si/Al复合材料显微组织和干滑动摩擦磨损行为的影响。结果表明,在Mg2Si增强的Al基复合材料中添加适量的稀土元素Nd,对初生和共晶Mg2Si能够同时起到良好的变质作用,初生Mg2Si的形貌由粗大的树枝状或多角形块状转变为细小的块状,而共晶Mg2Si则由粗大的片状转变为细小的片状、纤维状或点状。并且初生和共晶Mg2Si尺寸大大减小。添加Nd后复合材料的磨损率和摩擦因数均比未添加Nd的复合材料低;添加0.5%的Nd(质量分数)使复合材料的磨损机理由磨粒、粘着及疲劳的综合磨损转变为单一的轻微磨粒磨损。Influences of Nd additions on the microstructure and dry sliding wear behaviors of cast Al-Mg2Si in situ metal matrix composites were investigated. The results show that the addition of proper Nd addition has significant modification effect on both primary and eutectic Mg2Si in the Al-15 Mg2Si composites. The morphology of primary Mg2Si is changed from dendritic to polyhedral shape and the eutectic Mg2Si from flake-like to very short fibrous or dot-like, and their average particle sizes are significantly decreased also. The wear rates and friction coefficient of the composites with Nd are lower than those without Nd, and the addition of 0.5%Nd changes the wear mechanism of the composite from the combination mechanism of abrasive, adhesive and delamination wear without Nd into single mild abrasion wear.

关 键 词：MG2SI AL复合材料 ND 变质 初生和共晶Mg2Si 摩擦磨损 

分 类 号：TB333[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]