Quantitative analysis of the microstructure in NiTi wires by Synchrotron X-ray diffraction: An approach to the cause of the Two Way Shape Memory Effect

2017 ◽  
Vol 712 ◽  
pp. 833-847 ◽  
Author(s):  
C. Urbina ◽  
F. Gispert-Guirado ◽  
F. Ferrando ◽  
S. De la Flor
Keyword(s):  
Quantitative Analysis ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Niti Wires

Effect of Nb Content on Superelastic Properties of Biomedical Ti–Zr-Based Shape Memory Alloys

2020 ◽  
Vol 12 (9) ◽  
pp. 1394-1398
Author(s):  
Shuanglei Li ◽  
Mi-Seon Choi ◽  
Tae-Hyun Nam
Keyword(s):  
Tensile Test ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Nb Content

Ti–18Zr–xNb–2Sn (x = 10, 11, 11.5, 12, 12.5) (at.%) shape memory alloys were fabricated by arc melting then phase constitutions and superelastic properties were investigated by X-ray diffraction (XRD) and tensile test at various temperatures between 178 K and 413 K. Excellent superelasticity was observed in 12.5Nb alloy at temperatures between 258 K and 298 K. Both superelasticity and shape memory effect were observed in 12Nb alloy at temperatures between 233 K and 383 K. Only shape memory effect was observed in 11Nb and 11.5Nb alloys at temperatures between 298 K and 383 K. 12.5Nb and 12Nb alloys consisted of the main β phase and athermal ω. The amount of β phase decreased with increasing Nb content. 10Nb alloy consisted of main α″ martensite and a small amount of β phase. The Ms temperature measured from the Clausius–Clapeyron relationship decreased greatly with increasing Nb content (100 K/at.% Nb) in these Ti–Zr–Nb–Sn alloys.

A new type of intrinsic two-way shape-memory effect in hooks of NiTi-wires

2003 ◽  
Vol 112 ◽  
pp. 1177-1180 ◽  
Author(s):  
A. Schuster ◽  
H. F. Voggenreiter ◽  
D. C. Dunand ◽  
G. Eggeler
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
New Type ◽  
Niti Wires

Phase Constitution, Mechanical Property and Corrosion Resistance of the Ti-Nb Alloys

2006 ◽  
Vol 324-325 ◽  
pp. 655-658 ◽  
Author(s):  
Bao Lai Wang ◽  
Yan Bo Wang ◽  
Yu Feng Zheng
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Artificial Saliva ◽  
X Ray Diffraction ◽  
Phase Constitution ◽  
Β Phase ◽  
Bending Strain ◽  
35Nb Alloy

Recently, people devote to the development of Ni-free shape memory alloys in order to avoid the Ni-hypersensitivity and toxicity and pursue absolute safety. The shape memory effect and superelasticity have been reported in the biomedical Ti-Nb based alloys. The purpose of this paper is to report the phase constitution, tensile property, shape memory effect and corrosion resistance of the Ti-Nb alloys. The phase constitutions of the Ti-Nb alloys are investigated by means of X-ray diffraction (XRD). The results reveal that β+α′′ phases are presented in the Ti-35Nb alloy and only β phase in the Ti-52Nb alloy at room temperature. The tensile test and bending tests indicate that the Ti-35Nb alloy exhibits shape memory effect. The shape recovery ratio is near to 80% when the bending strain is 4.4% and decreases with the increase of the total bending strain. The corrosion resistance of the Ti-Nb alloys in the Hank's solution and artificial saliva (pH=7.4) at 37 are investigated by OCP, Tafel and anodic polarization methods. The results indicate that the Ti-35Nb alloy has a better corrosion resistance in the artificial saliva and can replace the Ti-Ni alloy in the dental application. In the non-oral condition, the Ti-52Nb alloy may be preferable.

Mechanical and X-RAY Characterisation of the Assisted Two-Way Shape Memory Effect In NiTi

2000 ◽  
Vol 39 (2) ◽  
pp. 217-224 ◽  
Author(s):  
S. Turenne ◽  
S. Prokoshkin ◽  
V. Brailovski ◽  
N. Sacépé
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
X Ray

Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal

2016 ◽  
Vol 879 ◽  
pp. 738-743
Author(s):  
Oleg Heczko ◽  
Vít Kopecký ◽  
Jan Drahokoupil ◽  
Marek Vronka ◽  
Oleksiy Perevertov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
High Mobility ◽  
Type I ◽  
X Ray Diffraction ◽  
Magnetic Shape Memory ◽  
Twin Boundaries ◽  
Induced Structure

Magnetic shape memory effect is general name for several effects in which the most visible feature is huge strain induced by magnetic field. Magnetic field-induced structure reorientation (MIR) occurs due to motion of twin boundaries in single phase. As the magnetic field is a relatively weak force compared with mechanical stress, very high mobility of twin boundaries is crucial. Here we study the properties of martensite relevant for this effect using X-ray diffraction, optical and electron microscopy, magnetic observation and mechanical testing. In 10M modulated martensite, two types of mobile twin boundary (type I and type II) are observed with complex layered microstructures consisting of a hierarchy of twinning systems. We search for analogue with non-magnetic Cu-Ni-Al shape memory alloy.

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