On 2-stage martensitic transformation behavior in aged Ti<sub>50.5</sub>Ni<sub>33.5</sub>Cu<sub>11.5</sub>Pd<sub>4.5</sub> alloys with near-zero thermal hysteresis
Abstract The microstructures and martensitic transformation of a Ti-rich Ti 50.5 Ni 33.5 Cu 11.5 Pd 4.5 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 (B2 1 –B19 1 and B2 2 –B19 2 ) due to the precipitation of Ti 2 Cu-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.
Authors
- Y. Cai (ORCID: https://orcid.org/0000-0001-9149-9414)
- Xiangjiu Guan (ORCID: https://orcid.org/0000-0003-1877-3282)
- Hang Li (ORCID: https://orcid.org/0000-0002-9348-8724)
- Xianglong Meng
- Wei Cai (ORCID: https://orcid.org/0000-0002-1632-0952)
- Lili Chen (ORCID: https://orcid.org/0000-0001-8290-5230)
Institutions
- Shihezi University (CN)
- Heilongjiang University of Science and Technology (CN)
- Harbin Institute of Technology (CN)
Publication Details
- Journal
- International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde)
- Published
- 2025-02-01
- DOI
- https://doi.org/10.1515/ijmr-2024-0022
- Primary Topic
- Shape Memory Alloy Transformations
- Type
- article
- Field-Weighted Citation Impact
- 0.00