Abstract
RuAl is potentially one of the structural intermetallics with high melting temperature(2333K). We applied mechanical alloying to prepare the intermetallic compounds NiAl and RuAl, which crystal structure are B2 type, using a mixture of elemental Ni, Ru and Al powders. Single phase NiAl have been obtained by ball milling for 75h, while RuAl for 200h. The grain size of NiAl thus obtained was 8.5nm, while RuAl 7nm, that was estimated by the Hall plot. RuAl powder, obtained by mechanical alloying for 400h, was consolidated by Plasma Activated Sintering (PAS) process under the conditions of 50MPa, 1673K and 480sec. Vickers hardness was examined between room temperature and 1373K. RuAl compact obtained by PAS had about two times as high hardness as arc melted RuAl over the whole temperature range measured. Vickers hardness of RuAl compact measured at room temperature was 690Hv and there was no crack around the indentation. The result suggests that RuAl compact had reasonable toughness at room temperature.
