碳纳米管增强AlSi7Mg合金的制备及力学性能  

Fabrication of CNTs/AlSi7Mg Composites and its Mechanical Properties

作　　者：曾刚[1] 曾效舒[1] 邬胜伟[1] 魏嘉麒[1] 

机构地区：[1]南昌大学机电工程学院

出　　处：《特种铸造及有色合金》2013年第2期170-173,共4页Special Casting & Nonferrous Alloys

基　　金：江西省科技厅攻关项目(z02727);南昌大学分析测试中心测试基金(201203)

摘　　要：将普通碳纳米管、化学包覆镍碳纳米管分别与铝粉按质量比1:5混合球磨后压制成块,采用钟罩将碳纳米管预制块压入铝合金熔体制备CNTs/AlSi7Mg复合材料。测试了复合材料的室温力学性能,通过X射线衍射仪(XRD)、扫描电镜(SEM)和能谱分析仪(EDS)对复合材料及其断口进行观察与分析。结果表明,碳纳米管的加入能细化复合材料的组织,使复合材料的二次枝晶臂间距减小,明显提高复合材料的抗拉强度、硬度和弹性模量。化学包覆镍碳纳米管加入量为1.0%时,T6态复合材料的抗拉强度、硬度(HV)和弹性模量分别达到了306MPa、118和132GPa,比基体提高了33.4%、25.5%和53.9%。复合材料的断口呈准解理型脆性断裂的特征。Preforms were prepared with commercial carbon nanotubes,Ni-CNTs and A1 with the mass ra- tio of 1 ： 5 . Then the CNTs/A1Si7Mg composites were produced by immersing the preforms into the a- luminum alloy melt with bell jar. The ambient mechanical properties of the composites were tested,and the structure and tensile fracture morphology of the composites were observed and analyzed by X-ray dif- fractometry（XRD）, scanning electron microscopy （SEM） and energy dispersive spectrum analysis （EDS）. The results show that with CNTs addition, the grains of the composite can be refined, and the secondary dendrite arm space of the composites is reduced. Meanwhile, the tensile strength, the micro- hardness and the elastic modulus of the composites are improved significantly. The tensile strength, the micro-hardness HV and the elastic modulus of the composites with 1.0%CNTs reach 306 MPa , 118.0 and 132 GPa, respectively, increased by 33.4% .25.5% and 53.9%, respectively, compared with those of the matrix alloy. The fracture of the composites is characterized by quasi-cleavage type brittle frac- ture.

关 键 词：碳纳米管 预制块 AlSi7Mg铝合金 复合材料 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程] TB383.1