期刊
SHAPE MEMORY AND SUPERELASTICITY
卷 7, 期 1, 页码 166-178出版社
SPRINGER INT PUBL AG
DOI: 10.1007/s40830-021-00309-2
关键词
Superelasticity; Thermal cycling; Transformation temperature; TiNb alloys
资金
- EPSRC
- Defence Science and Technology Laboratory through the provision of an Industrial CASE studentship
- EPSRC [2110120] Funding Source: UKRI
The study demonstrates the sensitivity of metastable beta titanium alloys to thermal history, leading to large variations in the stable range of superelastic behavior. The theory of omega formation suppressing the martensitic transformation is questioned, and an alternative mechanism based on a total stress approach is suggested.
Metastable beta titanium alloys, such as Ti-24Nb-4Zr-8Sn, have potential for application in vibration damping systems due to their ability to display superelastic behaviour. However, their use is currently limited due to large variations in the temperature range over which this behaviour is stable, which can additionally be shown to depend on the thermal history of the sample. This study demonstrates the sensitivity of the microstructure to thermal history and highlights a possible cause for this variability. Currently held theories of omega formation supressing the martensitic transformation have been called into question and an alternative mechanism based on a total stress approach has been suggested. Understanding this variability enables better design of alloys and processing routes in order to achieve materials with the desired properties required for industrial application.
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