Comparative study on arc-melted and plasma-sintered beryllides
アーク溶解法及びプラズマ焼結法によって合成したベリライドの特性比較
金 宰煥; 中道 勝
Kim, Jae-Hwan; Nakamichi, Masaru
This study compares arc-melted and plasma-sintered beryllides, investigating the effects of density, hardness, microstructure, and annealing on stability. From the electron probe micro-analyzer and X-ray diffraction analysis results, it was obvious that the plasma-sintered samples, including those with 3 and 5atm% Ti, were composed of Be and BeTi phases, while BeTi and BeTi phases were additionally observed for the Be-7atm% Ti sample. In case of the arc-melted beryllides, it consisted of Be and BeTi in the 3atm% Ti and 5atm% Ti samples, whereas the BeTi phase surrounded BeTi as a peritectic phase for Be-7atm% Ti. Density and hardness measurements confirmed that the plasma-sintered beryllides were sintered with higher density and hardness than the arc-melted beryllides. In addition, the annealing treatment at 1473 K for 5 h was carried out to investigate the homogenization of the compositional structure. From the results of observation analysis for the specimens denoted as Be-3atm% Ti and Be-5atm% fabricated by both methods, there was no change on compositional structure. However, for arc-melted Be-7atm% Ti, the Be phase was almost diminished, whereas there was a slight increase in the BeTi phase and a slight decrease in the BeTi phase. In the case of the plasma-sintered Be-7atm% Ti specimen, it was clarified that the BeTi and BeTi phases were homogenized into the BeTi phase.