Shape memory and superelastic behavior of Ti–7.5Nb–4Mo–1Sn alloy

2011 ◽  
Vol 32 (8-9) ◽  
pp. 4614-4617 ◽  
Author(s):  
D.C. Zhang ◽  
J.G. Lin ◽  
W.J. Jiang ◽  
M. Ma ◽  
Z.G. Peng
Keyword(s):  
Shape Memory ◽  
Superelastic Behavior

Pseudoelasticity of Cu-13.8Al-Ni Alloys Containing V and Nb

2008 ◽  
Vol 59 ◽  
pp. 101-107 ◽  
Author(s):  
Rodinei Medeiros Gomes ◽  
Ana Cris R. Veloso ◽  
V.T.L. Buono ◽  
Severino Jackson Guedes de Lima ◽  
Tadeu Antonio de Azevedo Melo
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Shape Recovery ◽  
Cold Water ◽  
Low Cost ◽  
Tensile Tests ◽  
Grain Refiner ◽  
Good Shape ◽  
Potential Applications ◽  
Superelastic Behavior

Polycrystalline copper-based shape memory alloys have been of particular interest in relation to Ni-Ti because of their low cost and good shape memory effect. Nevertheless the absence of a pronounced pseudoelasticity effect restricts the number of potential applications. In this work, the influence of Nb and V on the microstructure and the mechanical properties was investigated. Samples of Cu-13.8 Al-Ni containing V and Nb alloy were prepared by induction and solution treated at 850°C and then further quenched into cold water. The addition of Nb and V promotes the formation of precipitates which act as grain refiner and subsequently improve the mechanical properties. The tensile tests were performed at temperatures slightly inferior to Mf and superior to Af, to investigate the shape recovery and pseudoelasticity, respectively. Based on the analyses of the Cu-13,8Al-2Ni-1Nb (wt%) alloy was detected rupture strains greater than 14%, besides observation of the superelasticity of these alloys and quantification of this property by means of cycling, from 0 to strains between 1 and 7%. The studies performed on alloy Cu-13.8Al- 3,5Ni-1V (wt%) made it possible to determine rupture strains in the order of 3% and its superelastic behavior through cycling for deformations between 1 and 3%.

scholarly journals An SMA Passive Ankle Foot Orthosis: Design, Modeling, and Experimental Evaluation

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Liberty Deberg ◽  
Masood Taheri Andani ◽  
Milad Hosseinipour ◽  
Mohammad Elahinia
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Motion Analysis ◽  
Experimental Evaluation ◽  
Mechanical Systems ◽  
Drop Foot ◽  
Ankle Foot Orthosis ◽  
New Device ◽  
Superelastic Behavior ◽  
Foot Orthosis

Shape memory alloys (SMAs) provide compact and effective actuation for a variety of mechanical systems. In this work, the distinguished superelastic behavior of these materials is utilized to develop a passive ankle foot orthosis to address the drop foot disability. Design, modeling, and experimental evaluation of an SMA orthosis employed in an ankle foot orthosis (AFO) are presented in this paper. To evaluate the improvements achieved with this new device, a prototype is fabricated and motion analysis is performed on a drop foot patient. Results are presented to demonstrate the performance of the proposed orthosis.

Superelastic behavior modeling in shape memory alloys

2003 ◽  
Vol 112 ◽  
pp. 205-208 ◽  
Author(s):  
S. Arbab Chirani ◽  
D. Aleong ◽  
C. Dumont ◽  
D. McDowell ◽  
E. Patoor
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Behavior Modeling ◽  
Superelastic Behavior

Influence of incorporated nanoparticles on superelastic behavior of shape memory alloys

2020 ◽  
Vol 776 ◽  
pp. 139025
Author(s):  
Victor A. L'vov ◽  
Anna Kosogor ◽  
Serafima I. Palamarchuk ◽  
Gregory Gerstein ◽  
Hans J. Maier
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Superelastic Behavior

scholarly journals Finite Element Studies of Triple Actuation of Shape Memory Alloy Wires for Surgical Tools

2018 ◽  
Author(s):  
Bardia Konh
Keyword(s):  
Shape Memory ◽  
Artificial Heart ◽  
Heart Valves ◽  
Engineering Systems ◽  
Design And Development ◽  
Orthodontic Wires ◽  
Recoverable Strain ◽  
Artificial Heart Valves ◽  
Innovative Products ◽  
Superelastic Behavior

Since the early discovery in 1951 [1], shape memory alloys (SMAs) have been used in design and development of several innovative engineering systems. SMAs’ unique characteristics have introduced unconventional alternatives in design and development of advanced devices. SMA’s field of applications has covered many areas from aerospace to auto industries, and medical devices [2]. During the past couple of decades, scientists have suggested material models to predict the SMA’s shape memory effect (SME) and its superelastic behavior. The superelastic characteristic of SMAs (its capability to exhibit a large recoverable strain) has been widely used to develop innovative products including biomedical implants such as stents, artificial heart valves, orthodontic wires, frames of indestructible spectacles, etc. However, its actuation capabilities, known as SME, hasn’t been thoroughly expanded. The number of products privileging from SMA’s SME behavior has been very limited. The reason relies on the SMA’s complex material properties that depend on the stress, strain and temperature at every stage of actuation as well as the material’s processing and the thermomechanical loading history.

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Science ◽  
2020 ◽  
Vol 369 (6505) ◽  
pp. 855-858 ◽  
Author(s):  
Ji Xia ◽  
Yuki Noguchi ◽  
Xiao Xu ◽  
Takumi Odaira ◽  
Yuta Kimura ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Temperature Dependence ◽  
Critical Stress ◽  
Outer Space ◽  
Alloy System ◽  
Large Temperature ◽  
Superelastic Behavior ◽  
Iron Based ◽  
Metal Shape

Shape memory alloys recover their original shape after deformation, making them useful for a variety of specialized applications. Superelastic behavior begins at the critical stress, which tends to increase with increasing temperature for metal shape memory alloys. Temperature dependence is a common feature that often restricts the use of metal shape memory alloys in applications. We discovered an iron-based superelastic alloy system in which the critical stress can be optimized. Our Fe-Mn-Al-Cr-Ni alloys have a controllable temperature dependence that goes from positive to negative, depending on the chromium content. This phenomenon includes a temperature-invariant stress dependence. This behavior is highly desirable for a range of outer space–based and other applications that involve large temperature fluctuations.

OS2103 Effect of Heat Treatment on Superelastic Behavior of Ti-Ni Shape Memory Alloy

2011 ◽  
Vol 2011 (0) ◽  
pp. _OS2103-1_-_OS2103-2_
Author(s):  
Tatsuya USHIRODA ◽  
Takaei YAMAMOTO ◽  
Hiroki CHO ◽  
Toshio SAKUMA
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Superelastic Behavior
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