Thermal Expansion Characteristic of MWCNTs/AZ80 Composite Prepared by Friction Stir Processing
AZ80 based composite reinforced with multi-walled nanotubes was prepared by friction stir processing.The thermal expansion characteristic of MWCNTs/AZ80 composite was investigated.The results show that the composite has smaller thermal expansion coefficients compared with annealed AZ80 matrix materials and the FSPed AZ80 samples,which indicates that the addition of MWCNTs can effectively decrease the thermal expansion coefficient of the matrix.The thermal expansion coefficients of MWCNTs/AZ80 composite decrease along with the increase of volume fraction of MWCNTs.The heat treatment has a positive effect on the thermal expansion coefficients of the composite,and the annealing or solution+aging treatments can decrease the thermal expansion coefficients of the composite.