熔体直接反应法制备TiB2/ZL101复合材料的显微组织及切削性能
Microstructure and Cutting Performance of TiB2/ZL101 Composites Prepared by Direct Reaction Method
摘 要
用熔体直接反应法制备了TiB2/ZL101复合材料;用光学显微镜、SEM、拉伸试验机等对复合材料的组织、力学和切削性能进行了测试分析,并与用钠盐变质处理的ZL101合金进行了对比.结果表明:制备的TiB2/ZL101复合材料组织为细小等轴树枝状α-Al及细小板片共晶硅,其抗拉强度高于ZL101铝合金的,但塑性却低于ZL101铝合金的;切削工艺相同时,切削ZL101合金和TiB2/ZL101复合材料刀具后刀面磨损速率相近,而后者加工表面粗糙度值低于前者的;TiB2/ZL101复合材料的加工表面存在两种类型裂纹,第二种类型裂纹对其疲劳性能有害.
熔体直接反应法
切削性能
TiB2/ZL101 composite
direct reaction method
cutting performance
Abstract
The TiB2/ZL101 composites were fabricated by direct reaction technique.The microstructure of composites was analyzed by means of optical microscoper,SEM and tensile tester.The mechanical properties and cutting performance of the composite were also tested.ZL101 alloy modified by Na-salt was compared with the composite.The results show that the microstructure of TiB2/ZL101 composite was fine equiaxed dendrities α-Al and fine plate-like eutectic silicon,the tensile strength was higher than that of ZL101 alloy,but the plasticity was opposite.Under the same cutting condition,the tool flank wear rate was close for cutting TiB2/ZL101 composite and ZL101 modified by Na-salt.The surface roughness of the composite was less than that of ZL101 modified by Na-salt.Two types of cracks were observed on the surface of cutting rod for TiB2/ZL101 composite.The second type of crack was harmful to the fatigue property of composite.
中图分类号 TB331
所属栏目 新材料 新工艺
基金项目 南京工程学院引进人才资助项目(121105050002)
收稿日期 2008/10/30
修改稿日期 2009/6/1
网络出版日期
作者单位点击查看
备注方信贤(1964-),男,江苏张家港人,副教授,博士.
引用该论文: FANG Xin-xian. Microstructure and Cutting Performance of TiB2/ZL101 Composites Prepared by Direct Reaction Method[J]. Materials for mechancial engineering, 2009, 33(12): 70～73
方信贤. 熔体直接反应法制备TiB2/ZL101复合材料的显微组织及切削性能[J]. 机械工程材料, 2009, 33(12): 70～73
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【12】杨荣福,董申.金属切削原理[M].北京:机械工业出版社,1988:3.
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