【摘要】 采用片状粉末冶金法在Al-Cu合金中加入CNTs,比较了加入CNTs前后材料的密度、电导率、硬度、拉伸强度和高温流变行为,结合扫描电镜、透射电镜分析了性能变化的原因。结果发现,CNTs的添加导致合金的晶粒细化,使合金的硬度增加、抗拉强度增加;Al-Cu合金基体和CNTs/Al-Cu复合材料高温应力应变曲线变化趋势一致,但由于CNTs的增加导致复合材料在不同的变形温度和变形速率下,流变应力比基体高,在低温和高变形速率下特别明显。更多还原

【Abstract】 In this paper,we added CNTs to Al-Cu alloy by flake powder metallurgy,compared the density,electrical conductivity,hardness,tensile strength and high temperature rheological behavior before and after the addition of CNTs and analyzed the causes of the changes of the properties by SEM and TEM.The results show that the addition of CNTs leads to the grain refinement,increases the hardness and the tensile strength of the alloy.The changes of the high temperature stress and strain curves of the Al-Cu alloy and CNTS/Al-Cu composite are consistent,but the flow stress of the composites are higher than that of the matrix at different deformation temperature and deformation rate due to the increase of CNTs,especially at low temperature and high deformation rate更多还原