抄録
The alloy powder of 2Nb/Al composition was prepared by mechanical alloying. The alloy powder became homogeneous and showed an amorphous-like pattern in X-ray diffraction after milling with a small amount of additives for 396ks. This mechanically alloyed powder kept the amorphous phase even after heating up to 973K for 600s, and was changed to Nb2Al phase by heating over the temperature of 1073K. The compact of this powder sintered at 973K for 300s by pulse current pressure sintering (PCPS) was not consolidated, although the amorphous structure was kept even after heating. On the other hand, the compact sintered at 1673K by PCPS method consisted of mainly Nb2Al phase and a small amount of uncertain phase. The density for the compacts sintered at 1673K was 7.16 × 103 kg/m3, which is about 5% higher than that for Nb2Al. Vickers hardness was 1000-1100, which is 15 to 30 % higher than that of Nb2Al (850-870). It can be speculated that these results are attributed to the finely dispersed particles containing Fe, which came from the container and/or balls for the mechanical alloying.
