Abstract
Ti-1mass%Sc mixed powder was milled up to 240h in argon gas atmosphere in a stainless pot with stainless steel balls. Pure Ti powder and Ti-20mass%Sc mixed powder were used as comparing materials. Mean particle sizes of MA powders increased with increasing MA time up to 72h and decreased with increasing MA time in the time more than 72h. The mean particle size of pure Ti powder milled for 240h was approximately 30μm to 30μm before milling. On the other hand that of Ti-1mass%Sc powder was approximately 10μm to 20μm before milling. In both pure Ti and Ti-1mass%Sc powder, the particles were hardened gradually with increasing MA time. The hardness of particles of pure Ti and Ti-1mass%Sc powders was approximately HV500 at the time of 240h to HV150 before milling. It was clarified that Sc was distributed uniformly in the particles after milled at 120h in Ti-20mass%Sc mixed powder. The particles of powders milled were maintained very high hardness even after heated for 1h at 1273K. The hardness of sintered body was very high and approximately HV500.
