Microstructures and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy strip fabricated by the melt overflow process

Melt overflow improved the workability and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy by suppressing the formation of TiCu phase and introducing crystallographic defects such as dislocations. The fracture stress and strain of the alloy strip prepared by melt overflow were 445 MPa an...

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Bibliographic Details
Published in:Scripta materialia 2010, Vol.62 (2), p.71-74
Main Authors: Kang, Seok-won, Lim, Yeon-Min, Lee, Yong-hee, Moon, Hyo-jung, Kim, Yeon-wook, Nam, Tae-hyun
Format: Article
Language:English
Subjects:
Martensitic phase transformation
Microstructure
Rapid solidification
Shape memory alloys
Transformation hysteresis
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Summary:Melt overflow improved the workability and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy by suppressing the formation of TiCu phase and introducing crystallographic defects such as dislocations. The fracture stress and strain of the alloy strip prepared by melt overflow were 445 MPa and 7.6%, respectively, which were larger than those of the alloy rod fabricated by conventional casting. Transformation hysteresis of the strip was 3.8 K under 120 MPa, which was much smaller than that of the rod.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2009.09.034