包覆镍的碳纳米管增强AZ91镁基复合材料的显微组织与力学性能
Microstructure and Mechanical Properties of AZ91 Alloy Composites Reinforced with Ni-Coated Carbon Nanotubes
摘 要
用搅拌铸造技术制备了化学包覆镍的碳纳米管增强AZ91镁基复合材料;研究了碳纳米管对其显微组织和力学性能的影响,并利用扫描电子显微镜和能谱仪对复合材料断口形貌进行了观察和分析.结果表明:化学包覆镍碳纳米管明显细化了基体合金的晶粒,对AZ91镁合金有较的增强效果;与基体合金相比,加入适当碳纳米管时复合材料的抗拉强度、弹性模量、显微硬度均显著增加,伸长率和抗拉强度最多可分别提高90.44%和37.5%,但是碳纳米管加入量过多会导致其产生偏聚,使复合材料力学性能下降.
碳纳米管
复合材料
力学性能
AZ91 magnesium alloy
carbon nanotube
composite
mechanical property
Abstract
AZ91 alloy composites reinforced with nickel coated carbon nanotubes(Ni-CNTs) were fabricated by stirring casting technology.The effects of carbon nanotubes on the mechanical properties and microstructure of the composites were studied,and the fractographs were observed and analyzed by scanning electron microscopy and energy spectrum analysis.The results show that the nickel coated CNTs could refine grain size of the matrix alloy and strengthen mechanical properties of the AZ91 magnesium alloy.Compared with the matrix alloy,tensile strength,elastic modulus and microhardness of the composites had been enhanced significantly with proper adding.The elongation and tensile strength were increased by 90.44% and 37.5% respectively.But with the excessive addition of Ni-CNTs,the Ni-CNTs would segragate,and mechanical properties of the composites were reduced.
中图分类号 TG146.2 TB333
所属栏目 纳米材料
基金项目
收稿日期 2008/12/12
修改稿日期 2009/9/16
网络出版日期
作者单位点击查看
备注廖琳(1980-),女,江西九江人,学士.
引用该论文: LIAO Lin,YUAN Qiu-hong. Microstructure and Mechanical Properties of AZ91 Alloy Composites Reinforced with Ni-Coated Carbon Nanotubes[J]. Materials for mechancial engineering, 2010, 34(1): 92～95
廖琳,袁秋红. 包覆镍的碳纳米管增强AZ91镁基复合材料的显微组织与力学性能[J]. 机械工程材料, 2010, 34(1): 92～95
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参考文献
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【3】MORISADA Y,FUJII H,NAGAOKA T,et al.MWCNTs/AZ31 surface composites fabricated by friction stir processing[J].Mater Sci Eng A,2006,43:344-348.
【4】YANG J,SCHALLER R.Mechanical spectroscopy of Mg reinforced with Al2O3 short fibers and C nanotubes[J].Mater Sci Eng A,2004,57:512-515.
【5】WANG F X,GAO X P,LU Z W,et al.Electrochemical pro-perties of Mg-based alloys containing carbon nanotubes[J].Journal of Alloys and Compounds,2004,370(1/2):326-330.
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【12】GOH C S,WEI J,LEE L C,et al.Simultaneous enhancement in strength and ductility by reinforcing magnesium with carbon nanotubes[J].Mater Sci Eng A,2006,65:153-156.
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