Effect of heat treatment time and temperature variants on Ni-Ti shape memory alloy

2021 ◽  
Author(s):  
M.K. Siddharth ◽  
B.N. Sarada
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Treatment Time ◽  
Heat Treatment Time

scholarly journals Oxide Formation on NiTi Surface: Influence of the Heat Treatment Time to Achieve the Shape Memory

2015 ◽  
Vol 18 (5) ◽  
pp. 1053-1061 ◽  
Author(s):  
Alana Witt Hansen ◽  
Lilian Vanessa Rossa Beltrami ◽  
Leonardo Marasca Antonini ◽  
Denis Jardim Villarinho ◽  
Julio Cesar Klein das Neves ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Shape Memory ◽  
Treatment Time ◽  
Heat Treatment Time ◽  
Oxide Formation

Phase Transformations of Ferromagnetic Fe-Pd-Pt-Based Shape Memory Alloys

2003 ◽  
Vol 785 ◽  
Author(s):  
Gwon-seung Yang ◽  
Reid Jonasson ◽  
Seung-nam Baek ◽  
Kinzo Murata ◽  
Shozo Inoue ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Treatment Time ◽  
Heat Treatment Time ◽  
Induction Melting ◽  
Ferromagnetic Shape Memory Alloys ◽  
Transformation Temperatures ◽  
First Order

ABSTRACTSeveral ternary Fe-Pt-Pd alloys with the compositions of Fe-(25-x) at% Pt-x at% Pd and Fe-y at% Pt-(30-y) at% Pd were investigated to study their phase transformations in order to develop ductile ferromagnetic shape memory alloys appearing around room temperature. Alloys were prepared by vacuum floating induction melting, followed by hot rolling at 1000°C and homogenization at 900° C. Homogenized alloys were heat treated at 650°C for various periods of time in vacuum for atomic ordering in encapsulated quartz tubes, and quenched into iced water. It was found that in general the transformation temperatures changes with heat treatment time. In the case of Fe-23at.%Pt-2at.%Pd, Ms temperature increased and the difference between Ms and Mf increased with increasing heat treatment time, which was different from Fe3Pt where a degree of order becomes one. As heat treatment time increased, there was a tendency in that a strong first-order transformation in the disordered state was replaced by a weak first-order transformation. The Curie temperature of the alloys rose drastically with the addition of Pd, along with the transformation temperatures. Fe-23at.%Pt-2at.%Pd showed good shape memory effect after 8 hours of heat treatment at 650°C. This alloy showed much better shape recovery than any other binary Fe-Pt and Fe-Pd shape memory alloys.

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