摘要
采用高功率电火花沉积(ESD)设备在铸铝合金基体上成功制备出了具有网格状纳米Si强化的Al基复合材料。研究表明,复合材料中网格状Si相由许多粒径约50nm的颗粒状Si相相互连结而形成;块状的-αAl相填充在网格中间,形成"纳米尺度网格状Si相+块状-αAl相"的复合结构;复合材料的平均显微硬度约为105 HV,是传统工艺制备的相同成分合金的近两倍。分析认为,复合材料中晶粒细化和网格状高强度Si相所起到的载荷传递等作用是强度提高的主要原因。
With a high power electrospark deposition （ESD） processing unit, an Al-base metal matrix composites （MMCs） strengthened by latticed nano-Si were successfully prepared on cast aluminum alloy substrate. The results showed that latticed Si phase was composed of many fine Si particles with the size of - 50nm. The α-Al phase in block morphologies was filled in the lattices of Si phase, which leaded to the ＂latticed nano-Si phase ＋ block α-Al phase＂ composite strucutres. The microhardness of the MMCs was about 105HV which is about two times of the material prepared by troditional methods with same components. The improvement of strength of the Si/Al MMCs was mainly attributed to the grain refinement and the load transmission of latticed high strength Si phase.
出处
《金属功能材料》
CAS
2008年第2期16-19,28,共5页
Metallic Functional Materials
关键词
铝合金
电火花沉积
组织
制备
aluminum alloy
electrospark deposition
microstructure
preparation
