Hard X-ray studies of stress-induced phase transformations of superelastic NiTi shape memory alloys under uniaxial load

2008 ◽  
Vol 481-482 ◽  
pp. 414-419 ◽  
Author(s):  
M. Hasan ◽  
W.W. Schmahl ◽  
K. Hackl ◽  
R. Heinen ◽  
J. Frenzel ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
X Ray ◽  
Uniaxial Load ◽  
Niti Shape Memory Alloys

Shape Memory Alloys for Classroom Demonstrations, Laboratories, and Student Projects

2004 ◽  
Vol 827 ◽  
Author(s):  
Katherine C. Chen ◽  
Wendy C. Crone ◽  
Eric J. Voss
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Smart Materials ◽  
Constitutive Relations ◽  
Web Based ◽  
Student Projects ◽  
Change Transformation ◽  
Niti Shape Memory Alloys ◽  
Different Levels

AbstractShape memory alloys (SMAs) are unique materials that effectively capture the attention of students due to their dramatic phase transformations that result from temperature or stress. The fascinating properties and intriguing applications of SMAs can entice students to learn about the materials field, as well as relatively complicated materials concepts. SMAs have been incorporated into a range of courses under a variety of topics, such as crystal structures, phase transformations, kinetics, constitutive relations, and smart materials. The concepts can be presented at different levels of knowledge, appropriate to the learning objectives for the particular audience. Several educational activities using NiTi shape memory alloys have been developed, such as web-based videos, shape setting of new designs, classroom demonstration of actuation, visualization of stress-induced transformations, and heat treatments to change transformation temperatures.

Low-Temperature XRD Study of Phase Transformations in NiTi and TiNiCo Shape Memory Alloys Used for the Preparation of the Prototypes of Medical Implants

2013 ◽  
Vol 203-204 ◽  
pp. 125-128 ◽  
Author(s):  
Zdzisław Lekston ◽  
Maciej Zubko
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Powder Diffraction ◽  
Diffraction Method ◽  
Martensite Phase ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
X Ray

The NiTi shape memory alloys with ternary additions of Co are being considered for future applications in the construction of medical products. In this study the commercially available Ni50.8Ti49.2 medical alloy and Ti50Ni48.7Co1.3 alloy obtained by the conventional VIM technique, were used to prepare shape memory and superelastic staples. The phase transformations in the wires of those alloys after various thermo-mechanical and thermal treatments have been defined by the differential scanning calorimetry (DSC) method and three-point bending and free recovery ASTM F2082-06 tests. In this work the courses of phase transformations in the studied alloys were investigated by means of the low-temperature X-ray powder diffraction method. In both alloys after cold working and annealing during cooling two phase transformations occur: from parent B2-phase to rhombohedral R-phase and monoclinic B19’ martensite phase. Such phase transformations are fully reversible during heating and the obtained characteristic temperatures from DSC and X-ray powder diffraction measurements are in good agreement.

scholarly journals Atomic scale processes of phase transformations in nanocrystalline NiTi shape-memory alloys

2017 ◽  
Vol 123 ◽  
pp. 90-101 ◽  
Author(s):  
Won-Seok Ko ◽  
Sascha B. Maisel ◽  
Blazej Grabowski ◽  
Jong Bae Jeon ◽  
Jörg Neugebauer
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Atomic Scale ◽  
Niti Shape Memory Alloys

Influence of Ni on martensitic phase transformations in NiTi shape memory alloys

2010 ◽  
Vol 58 (9) ◽  
pp. 3444-3458 ◽  
Author(s):  
J. Frenzel ◽  
E.P. George ◽  
A. Dlouhy ◽  
Ch. Somsen ◽  
M.F.-X. Wagner ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Martensitic Phase ◽  
Martensitic Phase Transformations ◽  
Niti Shape Memory Alloys

Influence of carbon on martensitic phase transformations in NiTi shape memory alloys

2007 ◽  
Vol 55 (4) ◽  
pp. 1331-1341 ◽  
Author(s):  
J. Frenzel ◽  
Z. Zhang ◽  
Ch. Somsen ◽  
K. Neuking ◽  
G. Eggeler
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Martensitic Phase ◽  
Martensitic Phase Transformations ◽  
Niti Shape Memory Alloys
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