PURPOSE: To remarkably improve the strength of an intermetallic compound without impairing its lightness by subjecting fine Al3Ti base alloy powder in which a part of Al is substituted by Mo to hot molding.

CONSTITUTION: Al3Ti series powder is mixed with, by atom, 0.13 to 3.0 Mo powder, and after that, this mixed powder is uniformly dispersed and refined into alloy powder. This alloy powder is subjected to hot molding and is thereafter subjected to diffusion heat treatment of Mo, at need. By this method, the strength of the lightweight Al3Ti base intermetallic compound can remarkably be improved. Concerning the amt. of Mo to be added, in the case above the upper limit, the embrittlement of the stock is made severe, and in the case of the lower limit or below, the effect to be required can not be expected. Furthermore, uniform alloy powder produced by a rapid solidifying method, a mechanical alloying method or the like is preferably used as a raw material, and, in the case Mo is added by a mechanical alloying method, treatment can be executed without using lube oil owing to the excellent lubricating effect of Mo.