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离心铸造Mg2Si 和Si 自生增强锌基复合材料的组织与性能
引用本文:王渠东,陈勇军,陈文周,魏胤红,翟春泉,丁文江.离心铸造Mg2Si 和Si 自生增强锌基复合材料的组织与性能[J].复合材料学报,2005,22(3):109-115.
作者姓名:王渠东  陈勇军  陈文周  魏胤红  翟春泉  丁文江
作者单位:上海交通大学金属基复合材料国家重点实验室,上海,200030
基金项目:国家自然科学基金(No.599011007);高等学校重点实验室访问学者基金资助
摘    要:采用热模金属型工艺, 离心铸造Zn-27Al-9.8Mg-5.2Si 和Zn-27Al-6.3Mg-3.7Si 合金, 获得了内层聚集大量块状初生Mg2Si 、少量初生Si, 中层不含初生Mg2Si 和初生Si, 外层含有初生Mg- Si 和初生Si 的自生锌基复合材料。离心铸造Zn-27Al-3.2Mg-1.8Si 合金, 获得了不含初生Mg2Si 和初生Si 的单层材料。考察了复合材料的组织形貌, 检测了复合材料的硬度和耐磨性, 分析了复合材料的断裂模式。结果表明: 复合材料的内层因聚集大量的初生Mg2Si 和初生Si 具有较高的硬度和较优的耐磨性。复合材料的断裂方式为脆性断裂, 含共晶Mg2Si 和共晶Si 的中层在断裂中比含块状初生Mg2Si 和初生Si 的内层经历了更多的塑性变形。

关 键 词:离心铸造  Zn  合金  Mg2Si  Si  自生表面复合材料
文章编号:1000-3851(2005)03-0109-07
收稿时间:2004-05-31
修稿时间:2004-11-20

MICROSTRUCTURE AND PROPERTIES OF IN SI TU Zn MATRIX COMPOSITESREINFORCED BY Mg2Si AND Si USING CENTRIFUGAL CASTING
WANG Qudong,Chen Yongjun,CHEN Wenzhou,WEI Yinhong,ZHAI Chunquan,Ding Wenjiang.MICROSTRUCTURE AND PROPERTIES OF IN SI TU Zn MATRIX COMPOSITESREINFORCED BY Mg2Si AND Si USING CENTRIFUGAL CASTING[J].Acta Materiae Compositae Sinica,2005,22(3):109-115.
Authors:WANG Qudong  Chen Yongjun  CHEN Wenzhou  WEI Yinhong  ZHAI Chunquan  Ding Wenjiang
Affiliation:State Key Laboratory of Metal Mat rix Composites, Shanghai Jiao Tong University, Shanghai 200030, China
Abstract:In situ three-layer surface composites of Zn-27Al-9.8Mg-5.2Si and Zn-27Al-6.3Mg-3.7Si alloys were obtained by using preheated metal mould centrifugal casting.The surface composites possess the microstructure (accumulating) lots of blocky primary Mg_2Si and a small amount of blocky primary Si in the inner layer, accumulating primary Mg_2Si and primary Si in the outer layer, and without primary Mg_2Si and primary Si in the middle layer. But only single layer material without primary Mg_2Si and primary Si was obtained in centrifugally cast Zn-27Al-3.2Mg-1.8Si alloy. Microstructures of centrifugally cast Zn-27Al-Mg-Si alloys were investigated, The hardness, wearability and fracture mode of the composites were also analysed, The results show that the hardness and wear resistance of the composites depend mainly on the distribution of the primary Mg_2Si and primary Si along the radial direction. The inner layer of the composite shows the highest hardness and best wear resistance. The fracture mode of the composite is primarily brittle. The middle layer of the composite exhibits more deformation than the inner layer during the fracture.
Keywords:centrifugal casting  Zn alloy  Mg_2Si  Si  in situ surface composites
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