The effect of
heat treatment on the
microstructure and
mechanical properties of
cast Ti15-3 alloy have been studied by means of TEM, SEM and optical microscope, and results show microstructure of as cast
Alloy is characterized as large beta grains. For lack of strengthening action of precipitation, the tensile strength of the alloy is low but its elongation is high. After solution treatment flollowed by different aging treatments, it was observed that alpha
phases precipitated in the grains or at the grain boundaries. With the aging temperature rising or holding time prolonged, the
precipitation phases become coarser continuously. Compared with the as cast condition, the tensile strength of as heat treated alloy was considerably increased, but the elongation was dramatically decreased. Meanwhile, the dislocation tangled around the precipitation phases during the deformation process. The reasons for lower plasticity of alloy can be interpreted as the original large beta grains and the precipitation of alpha phases at the grain boundaries.
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