Effects of deformation temperature and amount on the two-way shape memory effect of solutionized Ni50.8Ti49.2 alloys

Temperature dependent compressive response and two-way shape memory effect (TWSME) of Ni50.8Ti49.2 (at.%) shape memory alloys were systematically investigated. It was found that solutionized Ni50.8Ti49.2 alloys could show positive and negative TWSME if they are plastically deformed in martensite and...

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Bibliographic Details
Published in:Intermetallics 2019-11, Vol.114, p.106607, Article 106607
Main Authors: Kaya, I., Acar, E., Karaca, H.E.
Format: Article
Language:English
Subjects:
Alloy systems
Austenite
Deformation effects
Martensite
Martensitic transformations
Mechanical testing
NiTi
Phase transformation
R-phase
Shape effects
Shape memory alloys
Strain
Temperature dependence
Two-way shape memory effect
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Summary:Temperature dependent compressive response and two-way shape memory effect (TWSME) of Ni50.8Ti49.2 (at.%) shape memory alloys were systematically investigated. It was found that solutionized Ni50.8Ti49.2 alloys could show positive and negative TWSME if they are plastically deformed in martensite and austenite (above Md), respectively. The maximum positive TWSME strain was 1.4% after martensite deformation of 8% at −90 °C and maximum negative TWSME strain of 0.5% was obtained after austenite deformation of 8% at 200 °C. [Display omitted] •Two-way shape memory effect of solutionized Ni50.8Ti49.2 (at.%) was studied.•Positive TWSME was observed after it is deformed in martensite.•Negative TWSME was observed after it is deformed in austenite (above Md).•The maximum positive TWSME strain was 1.4%.•The maximum negative TWSME strain was 0.5%.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2019.106607