Constitutive equation and processing map of equiatomic NiTi shape memory alloy under hot plastic deformation

2016 ◽  
Vol 26 (8) ◽  
pp. 2152-2161 ◽  
Author(s):  
Yan-qiu ZHANG ◽  
Shu-yong JIANG ◽  
Ya-nan ZHAO ◽  
Si-wei LIU
Keyword(s):  
Plastic Deformation ◽  
Constitutive Equation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Processing Map ◽  
Niti Shape Memory Alloy ◽  
Hot Plastic Deformation

Transformation/Deformation Behavior and its Constitutive Equation for Ti-Ni-Cu Shape Memory Alloy

2008 ◽  
Vol 59 ◽  
pp. 129-134
Author(s):  
Yuji Takeda ◽  
Takaei Yamamoto ◽  
M. Uegaki ◽  
Hiroki Cho ◽  
Toshio Sakuma ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Constitutive Equation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Constitutive Equations ◽  
Deformation Behavior ◽  
Volume Fraction ◽  
Transformation Process ◽  
Reverse Transformation ◽  
Transformation Behavior

This paper describes the transformation and deformation behavior and its constitutive equation for Ti-41.7Ni-8.5Cu (at%) shape memory alloy. Plastic deformation after pre-deformation is investigated using the volume fraction of slip-deformed martensite. New kinetics and constitutive equations are proposed for the reverse transformation process. The material constants in the proposed equationa are determined from the results of tensile and heating/cooling tests of Ti-41.7Ni-8.5Cu (at%) shape memory alloy. The calculated results describe well the deformation and transformation behavior affected by pre-strain.

Crystallization of amorphous NiTi shape memory alloy fabricated by severe plastic deformation

2014 ◽  
Vol 24 (6) ◽  
pp. 1758-1765 ◽  
Author(s):  
Shu-yong JIANG ◽  
Ming TANG ◽  
Ya-nan ZHAO ◽  
Li HU ◽  
Yan-qiu ZHANG ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Shape Memory Alloy ◽  
Severe Plastic Deformation ◽  
Shape Memory ◽  
Niti Shape Memory Alloy

Nanotexture Studies of NiTi Shape Memory Alloy after Severe Plastic Deformation with the Use of TEM

2012 ◽  
Vol 186 ◽  
pp. 90-93 ◽  
Author(s):  
Danuta Stróż ◽  
Jakub Palka ◽  
Zdzisław Lekston
Keyword(s):  
Plastic Deformation ◽  
Shape Memory Alloy ◽  
Severe Plastic Deformation ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
Specific Method ◽  
Transverse Movement ◽  
Alloy Properties ◽  
Maximal Strain

In this paper a specific method of severe plastic deformation (SPD) applied to the NiTi shape memory alloy and the obtained structure and the alloy properties are presented. Cold rolling combined with transverse movement of the rolls was the method. The maximal strain obtained was εc ≈ 10.20 for the relatively large specimens. Then the alloy was annealed in order to obtain samples of a given grain size. In the paper the structure of the alloy annealed at 350°C was studied with the use of TEM equipped with Nanomegas attachment ASTAR allowing determination of the orientation of grains in nanoareas.

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