Stability in Phase Transformation After Multiple Steps of Marforming in Ti-Rich Ni-Ti Shape Memory Alloy

Stability in Phase Transformation After Multiple Steps of Marforming in Ti-Rich Ni-Ti Shape Memory Alloy

Nickel-titanium (Ni-Ti) alloys are the most attractive among shape memory alloys (SMA) due to their good functionality properties coupled with high strength and ductility. The transformation temperatures in Ti-rich Ni-Ti SMA can be altered by subjecting them to suitable thermal and/or mechanical tre...

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Bibliographic Details
Published in:Journal of materials engineering and performance Vol. 20; no. 4-5; pp. 771 - 775
Main Authors: dos Santos Paula, Andersan, Mahesh, Karimbi Koosappa, Braz Fernandes, Francisco Manuel
Format: Journal Article
Language:English
Published: New York Springer US 01-07-2011
Springer Nature B.V
Subjects:
Characterization and Evaluation of Materials
Corrosion and Coatings
Engineering Design
Heat treatment
Intermetallic compounds
Martensitic transformations
Materials Science
Nickel
Nickel base alloys
Quality Control
Reliability
Safety and Risk
Shape memory alloys
Stability
Titanium
Transformation temperature
Tribology
shape memory alloy
marforming
phase transformation stability
Ti-rich Ni-Ti alloy
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Description
Summary:Nickel-titanium (Ni-Ti) alloys are the most attractive among shape memory alloys (SMA) due to their good functionality properties coupled with high strength and ductility. The transformation temperatures in Ti-rich Ni-Ti SMA can be altered by subjecting them to suitable thermal and/or mechanical treatments to obtain martensitic transformation in one or more steps above 0 °C. The goal of the present work is to investigate the stability of phase transformation characteristics, such as, type of sequence (one, two, and multiple steps) and transformation temperatures in Ti-Rich Ni-Ti SMA (Ni-51 at.%Ti), after being subjected to an initial heat treatment at 500 °C for 30 min in air followed by multiple steps of marforming (cold rolling, 30% thickness reduction) intercalated with heat treatments at 500 °C for 30 min in air and a final heat treatment at four different temperatures (400, 450, 500, and 600 °C) for 30 min in air atmosphere. Differential scanning calorimetry (DSC) and electrical resistivity (ER) were used to identify the phase transformation sequences and the stability of transformation temperatures during initial 10 thermal cycles for each sample with distinct thermo-mechanical treatment.
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ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-011-9920-5