抄録
By the reversion from hcp martensite (α') to bcc phase (β), refining of the microstructure with (α+β) two-phase was attempted in sintered Ti-(2-4)mass%Cr alloys. The relation between mechanical properties and micro-structures was also investigated for the specimens subjected to several heat treatments.
Quenching from β single phase region gives α' structure in the Ti-Cr alloys containing 2-4mass%Cr, and the annealing of α' in the (α+β) two-phase region leads to the formation of very fine micro-duplex structure of (α+β). The balance between tensile strength and elongation can easily be controlled by varying annealing temperature. In order to obtain excellent mechanical properties, however, β phase in the micro-duplex structure should be stable enough thermally and also against deformation.
