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Damping behaviors and strain recovery characteristics of Hf-modified TiNb-based shape memory alloys.
- Source :
-
Materials Research Bulletin . Feb2023, Vol. 158, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- • The microstructural features of Ti-Nb alloys were tailoring by changing Hf contents. • The damping behavior and functional performances of Ti-Nb alloys were dependent on Hf contents. • The mechanisms for the evolution of damping behavior and functional properties in Ti-Nb-Hf alloys were clarified. In the present study, the electron concentration, bond order and metallic average d-electron orbital energy level of Ti-Nb-Hf shape memory alloys were controlled by adjusting the Hf content, which further determined the phase constituents and phase stability. The Ti-Nb-Hf shape memory alloys with various Hf contents were composed of the α´´ martensite phase and β phase, regardless of Hf contents. With increasing Hf content, the martensitic transformation temperature (Ap) slightly increased. Hf addition could enhance the strength and optimize the strain recovery characteristics. A higher strength and larger recoverable strain can be obtained in Ti-Nb shape memory alloy modified by 2 at.% Hf due to grain refinement, precipitation strengthening and solution strengthening. Training can achieve perfect superelasticity with a completely recoverable strain of approximately 2%. In conclusion, the perfect combination of damping capacity and strain recovery characteristics can be attained by tailoring the Hf content in Ti-Nb-Hf shape memory alloys. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00255408
- Volume :
- 158
- Database :
- Academic Search Index
- Journal :
- Materials Research Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 160172869
- Full Text :
- https://doi.org/10.1016/j.materresbull.2022.112084