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.
AZ91 alloy composites reinforced with nickel coated carbon nanotubes(Ni-CNTs) were fabricated by stirring casting technology. The effects of carbon nanombes 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.
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