Shape memory and transformation behavior of high strength 60NiTi in compression

This study investigates the transformation behavior of highly Ni-rich 60NiTi alloys after aging at 600 °C for 3 h. After 600 °C-3h aging, R-phase disappeared and alloy transformed in one step. The latent heats of austenite to martensite and martensite to austenite transformations were 13 Jg−1 and 16...

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Bibliographic Details
Published in:Smart materials and structures 2016-12, Vol.25 (12), p.125031
Main Author: Kaya, I
Format: Article
Language:English
Subjects:
mechanical properties
NiTi
phase transformation
shape memory alloys (SMA)
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Summary:This study investigates the transformation behavior of highly Ni-rich 60NiTi alloys after aging at 600 °C for 3 h. After 600 °C-3h aging, R-phase disappeared and alloy transformed in one step. The latent heats of austenite to martensite and martensite to austenite transformations were 13 Jg−1 and 16.4 Jg−1, respectively, for 600 °C-3h aged alloy. The elastic strain energy of 0.75 Jg−1 was obtained in aged alloy. The maximum recoverable transformation strain of 1.7% is obtained under 500 MPa in compression. The superelastic behavior was observed accompanied with a recoverable strain of 1.4%, even high stress level of 1000 MPa is applied.
ISSN:0964-1726
1361-665X
DOI:10.1088/0964-1726/25/12/125031