Ni-coated carbon nano-tubes （Ni-CCNTs）/Mg-Al-Zn composites were fabricated by stirring casting method. High temperature mechanical properties of the composites were tested and microstructure was observed by means of OM （optical microscope）. The results show that with Al addition

the high temperature mechanical properties of the composites can be significantly improved. With 8% Al addition

high temperature tensile strength of the composites reaches maximum value of 152MPa

compared with that of matrix samples

increased by 166.7%. In addition

with increasing in Al addition

intermetallic compound Mg17Al12 phase is increased with more continuous distribution

resulting in the great refinement of grain size.