Abstract
The effects of ageing at 773 K for 3 h on microstructure and superelastic behavior in B2-B19' thermoelastic martensitic transformations of Ni45.3Ti29.7Hf20Pd5 (аt%) single crystals were investigated in this study. Ageing introduced nanoscale H and H′ phase precipitates, which resulted in a decrease of B2-B19' transformation temperatures, a dispersion hardening of the B2 phase and a twofold increase in the superelasticity range (up to ΔТSE=200 K) as compared with quenched crystals. In aged single crystals, reversible thermoelastic transformations with an extremely high critical stress level (σcr=1500 MPa) and reversible strain up to 1.8% were obtained at elevated temperatures (450 K).
Original language | English |
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Pages (from-to) | 498-503 |
Number of pages | 6 |
Journal | Materials Science and Engineering: A |
Volume | 674 |
DOIs | |
State | Published - Sep 30 2016 |
Bibliographical note
Publisher Copyright:© 2016 Elsevier B.V.
Keywords
- Ageing
- Hardening
- Martensitic transformations
- Shape memory
- Superelasticity
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering