Characterizations of precipitate phases in a Ti–Ni–Pd alloy

The microstructure of 46Ti–37.5Ni–16.5Pd (at.%) alloy was investigated by electron diffraction and high-resolution scanning transmission electron microscopy. The phase content and stability were determined at several different temperatures and times. Aging at 400 °C for 1 h results in a new phase (P1-phase), which is consumed by P-phase at longer aging times. At 450 °C, the P1-phase appears first, and then coexists with P-phase. At 500 °C, the entire alloy transforms into the P1-phase. At 550 °C, Ti3(Ni,Pd)4 phase begins to form.