离心铸造制备原位初晶硅和Mg2Si颗粒增强铝基骤变复合材料的组织与性能
Microstructure and Properties of Al-Based Sudden Change Composites Reinforced by Primary Si and Mg2Si Particles In-Situ Prepared by Centrifugal Casting
摘 要
采用离心铸造工艺制备初晶硅和Mg2Si颗粒混合增强铝基骤变复合材料,采用光学显微镜、X射线衍射仪、硬度计等对此复合材料组织与性能进行了研究.结果表明:该复合材料分为增强层(内层)与非增强层(外层),两层之间存在明显的宏观界线,内层偏聚了大量的初晶硅与Mg2Si颗粒,而外层仅有极少量的颗粒;从内层到外层,硬度呈现先降低后升高趋势;在小载荷下,内层与外层耐磨性能差异显著,而在大载荷下,两者差异微弱;初晶硅颗粒显著提高了复合材料在小载荷下的耐磨性,Mg2Si颗粒提高磨损性能的作用次之.
骤变复合材料
初晶硅
Mg2Si
centrifugal casting
sudden chang composite
primary Si
Mg2Si
Abstract
Al-based sudden change composites reinforced with mixture of primary Si and Mg2Si particles were prepared by centrifugal casting.Microstructure and properties of the composites were investigated by using optical microscopy,XRD and hardness tester.The results show that there were two layers including enforcement layer(inner layer) and un-reinforced layer(outer layer).Microscopic boundary between the two layers was obvious.Plenty of primary Si and Mg2Si segregated in the inner layer,and only a few of particles in the outer layer.The hardness showed increasing trendency from inner layer to outer layer.The wear resistance difference between inner layer and outer layer was big under small load ,but small under large load.The effect of the reinforcement primary Si particles on wear resistance improvement was more remarkable than that of Mg2Si particles.
中图分类号 TB331
所属栏目 材料性能及其应用
基金项目 重庆市自然科学基金资助项目(CSTC,2008BB4177)
收稿日期 2008/12/12
修改稿日期 2009/7/29
网络出版日期
作者单位点击查看
备注王开(1977-),男,重庆人,讲师,博士.
引用该论文: WANG Kai,ZHAI Yan-bo,LIU Chang-ming,ZHOU Mao-hua. Microstructure and Properties of Al-Based Sudden Change Composites Reinforced by Primary Si and Mg2Si Particles In-Situ Prepared by Centrifugal Casting[J]. Materials for mechancial engineering, 2010, 34(2): 47～51
王开,翟彦博,刘昌明,邹茂华. 离心铸造制备原位初晶硅和Mg2Si颗粒增强铝基骤变复合材料的组织与性能[J]. 机械工程材料, 2010, 34(2): 47～51
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【4】TAN Yin-yuan.In situ gradient composites of Al-16wt Si alloy by centrifugal casting[J].Acta Mater Composite Sinica,2002,5(19):48-51.
【5】WANG Qu-dong,CHEN Yong-jun,CHEN Wen-zhou,et al.The centrifugally cast Zn-Al-Mg-Si alloys and their in situ surface composites[J].Journal of Shanghai Jiaotong University,2005,39(7):1109-1114.
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【7】李克,王俊,周鸣,等.过共晶铝硅自生梯度复合材料的组织与性能[J].中国有色金属学报,2002,12(3):521-524.
【8】QIN Q D,ZHAO Y G,CONG P J,et al.Functionally graded Mg2Si/Al composite produced by an electric arc remelting process[J].Journal of Alloys and Compounds,2006,420:121-125.
【9】QIN Q D,ZHAO Y G,CONG P J,et al.Multi-layer functionally graded Mg2Si/Al composite produced by directional remelting and quenching process[J].Materials Science and Engineering A,2006,418:193-198.
【10】朱诚意,李光强,张峰,等.金属/陶瓷复合材料的原位合成及其结构研究[J].机械工程材料,2006,30(1):33-35.
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