Abstract
Precipitation process of Nb-60 at%Ti alloy aged at 550 and 350°C was examined by means of transmission electron microscopy. The experimental results obtained are as follows:(1) On aging at 550°C after solution-treatment, a transition phase t is formed during the β→α+β transformation. The t phase is disc-shaped with habit planes parallel to {100}β and is coherent with the matrix.(2) On aging at 550°C for a time as long as 1800 h after solution-treatment, an equilibrium phase α precipitates. The α phase is rod-shaped with habit planes parallel to {111}β. The α phase takes a hexagonal closed-packed structure with lattice parameters a=0.296 and c=0.471 nm and has the orientation relashionships (0001)α\varparallel(1\bar10)β and [11\bar20]β\varparallel[111]β.(3) On aging at 550°C after cold-rolling, the α phase precipitates without the t phase formation.(4) On aging at 350°C, a transition phase ω precipitates. The ω phase takes a hexagonal structure with lattice parameters a=0.463 and c=0.284 nm and has the orientation relation-ships (\bar2110)ω\varparallel(1\bar10)β and [0001]ω\varparallel[111]β.
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