Abstract
In this experiment, the effects of hydrostatic compression and Cu addition on the densification of Ti-50atooNi binary mixed powder compacts were examined by a dilatometric method, and the diffusion process between Ti and Ni powders was investigated by EPMA. The results obtained were as follows:
1) The abnormal expansion observed during heating process for the uniaxially compressed Ti-50at%Ni specimen, was considerably eliminated by the use of hydrostatic compression, where the theoretical density ratio (Ds/Dt×100%) was confirmed to be 82% for the heating rate of 10°C/min, and 85% for that of 5°C/min.
2) The phenomenon eliminating the abnormal expansion, which has been observed similarly in the above mentioned hydrostatic compressed specimen, was also recognized in the sintering process for Ti-(50-x)Ni-xCu ternary system, where the most effective amount of Cu addition was determined to be 2at%. It was confirmed that Cu is well homogenized in the Ti-48Ni-2Cu specimen sintered at 1050°C for 4h.
