抄録
Composites are fabricated from Zn-22Al base superplastic pre-alloy powder mixed individually with K2O-6TiO2, Al2O3, ZrO2 and SiC powders (or whiskers) to improve mechanical strength of the Zn-22Al base powder compacts. Effects of mixing ratio, mixing time and forming temperature on strength of the composites are investigated and densification behaviour of the composites is compared to that of a magnetic composite material.
It is found that the Al2O3 powder has good suitability for the Zn-22Al base superplastic powder and the moderate mixing ratio of the Al2O3 powder is 15wt%. Maximum ring crushing strength of the composites made by Zn-22Al-1.OCu-0.03Mg superplastic powder mixed with the Al2O3 powder of 15wt% reaches 655MPa under a condition of the forming temperature of 420°C.
