Influence of Thermal Cycling on Dilatation and Electrical Resistance of Ti - 49.8 at. %Ni Alloy after Hot Rolling

2010 ◽  
Vol 667-669 ◽  
pp. 985-990 ◽  
Author(s):  
R.I. Babicheva ◽  
I.Z. Sharipov ◽  
K.J. Mulyukov
Keyword(s):  
Thermal Cycling ◽  
Shape Memory ◽  
Phase Transformations ◽  
Shape Memory Effect ◽  
Hot Rolling ◽  
Electrical Resistance ◽  
Recoverable Strain ◽  
Ni Alloy ◽  
B2 Phase ◽  
Subsequent Stabilization

The effect of thermal cycling of the Ti - 49.8 at. % Ni alloy deformed by rolling at 500 оС on dilatation of the material was investigated. It was shown that R → B2 and B19' → B2 phase transformations take place during heating due to retaining of R-phase at the lowest temperature of cycling. The evolution and subsequent stabilization of two-way shape memory effect (TWSME) upon thermal cycling are caused by decreasing of the residual B19'- martensitic phase formed during rolling. It was revealed that recoverable strain of the alloy doesn’t exceed 0.8 % even after forty cycles.

Shape Memory Effect in Co-Ni Polycrystalline Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2029-2032 ◽  
Author(s):  
Wei Min Zhou ◽  
Yan Liu ◽  
Bohong Jiang ◽  
Xuan Qi
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Recovery ◽  
Recoverable Strain ◽  
Ni Alloys ◽  
Ni Content ◽  
Polycrystalline Alloys ◽  
Ni Alloy

Co-Ni alloys exhibit g(fcc)®e(hcp) martensitic transformation and show reversible induced strain under applied magnetic field, which means they are potential magneto-shape-memory materials. Polystalline of Co-Ni alloys with varied Ni content were prepared. The g(fcc)®e(hcp) martensitic transformation and shape memory effect (SME) of Co-Ni alloy were studied. The influences of Ni content and deformation temperature on SME were discussed. The shape recovery rate and recoverable strain decrease with the increase of Ni content.

The Concept of Physical Metric in the Thermomechanical Modeling of Phase Transformations With Emphasis on Shape Memory Alloy Materials

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Vassilis P. Panoskaltsis ◽  
Lazaros C. Polymenakos ◽  
Dimitris Soldatos
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Phase Transformations ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Material Model ◽  
Internal Variable ◽  
Theoretical Interest ◽  
Numerical Examples ◽  
Thermomechanical Modeling

In this work we derive a new version of generalized plasticity, suitable to describe phase transformations. In particular, we present a general multi surface formulation of the theory which is capable of describing the multiple and interacting loading mechanisms, which occur during phase transformations. The formulation relies crucially on the consideration of the intrinsic material (“physical”) metric as a primary internal variable and does not invoke any decomposition of the kinematical quantities into elastic and inelastic (transformation induced) parts. The new theory, besides its theoretical interest, is also important for application purposes such as the description and the prediction of the response of shape memory alloy materials. This is shown in the simplest possible setting by the introduction of a material model. The ability of the model in simulating several patterns of the experimentally observed behavior of these materials such as the pseudoelastic phenomenon and the shape memory effect is assessed by representative numerical examples.

Effect of prestrain on two-way shape memory effect in Ti-Ni alloy

Ecomaterials ◽  
1994 ◽  
pp. 1097-1100 ◽  
Author(s):  
S. Miyazaki ◽  
M. Kimura ◽  
H. Horikawa
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Ni Alloy

Effect of microstructure of austenite on the shape memory effect in an Fe-Mn-Si-Ni alloy

1997 ◽  
Vol 36 (7) ◽  
pp. 741-745 ◽  
Author(s):  
Y.Q. Wang ◽  
Z. Wang ◽  
J.H. Yang ◽  
L.C. Zhao
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Ni Alloy ◽  
Effect Of Microstructure
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