Abstract
Abstract The microstructures and martensitic transformation of a Ti-rich Ti50.5Ni33.5Cu11.5Pd4.5 alloy aged at 500 °C for durations ranging from 15 min to 25 h were systematically investigated. With increasing aging time, the precipitates exhibit continuous growth; however, their quantity initially increases and subsequently decreases. The morphology of the precipitates evolves from granular to lamellar forms. Post-aging treatment, the transformation sequence transitions from a one-stage (B2–B19) to a two-stage process (B21–B191 and B22–B192) due to the precipitation of Ti2Cu-type particles, maintaining near-zero hysteresis. The two-stage martensitic transformation originates from the combined effects of stress distribution heterogeneities and variations in Ni content induced by aging precipitation.
Published Version
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