Shape memory behavior associated with a two-stage R-phase transformation in Ti-50.9at%Ni alloy

2003 ◽  
Vol 112 ◽  
pp. 697-700 ◽  
Author(s):  
J. I. Kim ◽  
S. Miyazaki
Keyword(s):  
Phase Transformation ◽  
Shape Memory ◽  
Two Stage ◽  
Shape Memory Behavior ◽  
Ni Alloy

Shape Memory Behavior of Ti-50.9at%Ni Alloy after ECAE Processes

2007 ◽  
Vol 561-565 ◽  
pp. 2313-2316 ◽  
Author(s):  
Zhi Guo Fan ◽  
Chao Ying Xie
Keyword(s):  
Phase Transformation ◽  
Shape Memory ◽  
Initial Solution ◽  
Transformation Behavior ◽  
Shape Memory Behavior ◽  
Solution Treated ◽  
Ni Alloy ◽  
Coarse Grains ◽  
Shape Memory Properties ◽  
Before And After

The initial coarse grains of Ti-50.9at%Ni were obviously refined after eight ECAE processes. Effects of pressing number on the transformation behavior have been investigated in detail. Comparing with the initial solution-treated Ti-50.9at%Ni, the R-phase transformation was stimulated and the martensitic temperature Ms decreased with ECAE processes at 773K. The shape memory properties of Ti-50.9at%Ni alloy before and after ECAE processes at 773K have been measured. Good one way shape memory and superelasticity were obtained for the submicron-grained Ti-50.9at%Ni alloy.

scholarly journals Effect of a Small Amount of Hydrogen on Cyclic Shape Memory Behavior of Ti-Ni Alloy

1992 ◽  
Vol 56 (10) ◽  
pp. 1111-1117 ◽  
Author(s):  
Teruo Asaoka ◽  
Taisuke Kamimura ◽  
Hideo Saito ◽  
Yoichi Ishida
Keyword(s):  
Shape Memory ◽  
Shape Memory Behavior ◽  
Ni Alloy

Understanding the Shape-Memory Behavior in Ti-(~49 At. Pct) Ni Alloy by Nanoindentation Measurement

2012 ◽  
Vol 44 (4) ◽  
pp. 1722-1729 ◽  
Author(s):  
A. Sinha ◽  
S. Datta ◽  
P. C. Chakraborti ◽  
P. P. Chattopadhyay
Keyword(s):  
Shape Memory ◽  
Shape Memory Behavior ◽  
Ni Alloy ◽  
Nanoindentation Measurement

scholarly journals Shape memory behavior of nanostructured Ti-Ni alloy

2009 ◽  
Author(s):  
E. P. Ryklina ◽  
S. D. Prokoshkin ◽  
A. A. Chernavina
Keyword(s):  
Shape Memory ◽  
Shape Memory Behavior ◽  
Ni Alloy

Microstructure and Mechanical Properties of Sputter-Deposited Ti-Ni Alloy Thin Films

1999 ◽  
Vol 121 (1) ◽  
pp. 2-8 ◽  
Author(s):  
A. Ishida ◽  
S. Miyazaki
Keyword(s):  
Thin Films ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
The Other ◽  
Shape Memory Behavior ◽  
Good Shape ◽  
Ni Alloy ◽  
Fine Microstructure ◽  
Sputter Deposited

The shape memory effect, superelasticity and two-way shape memory effect of Ni-rich Ti-Ni sputter-deposited thin films were evaluated quantitatively. The results indicated that they are almost comparable to those of bulk specimens. On the other hand, Ti-rich Ti-Ni thin films were found to exhibit a good shape memory behavior owing to a peculiar fine microstructure unlike bulk specimens. Addition of Cu or Pd to a Ti-50at.%Ni thin film was also confirmed to improve the shape memory behavior. These results suggest that shape memory thin films are a promising material for microactuators.

scholarly journals Texture and Thermal Expansion Anomalies of B19'-Martensite in Tensile Deformed TiNi Shape Memory Alloy

1999 ◽  
Vol 32 (1-4) ◽  
pp. 71-81 ◽  
Author(s):  
V. M. Gundyrev ◽  
V. I. Zel'dovich ◽  
G. A. Sobyanina
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Solution Treated ◽  
Texture Axis ◽  
Ni Alloy ◽  
Axis Parallel ◽  
Dilatometric Studies ◽  
Strain Direction

The dilatometric studies of Ti-50.5 at.% Ni alloy have shown that the thermal expansion coefficient (TEC) of B19'-martensite varies considerably for the solution-treated and tensile-strained samples. In the undeformed state the TEC has the positive value α=9.7.10-6 K-1. After tensile straining the TEC decreases sharply and takes on a negative value (down to – 10.8.10-6 K-1). The reasons for the variation of the TEC of the B19'-phase of the solution-treated and deformed samples are discussed. The tensile straining was found to create in the samples an extremely sharp texture of the phase transformation, with the texture axis parallel to the strain direction. The TEC of monoclinic B1939;-lattice is different in various crystallographic directions and assumes a negative value in the [0 01]B19' direction.

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