Experimental investigation of the cyclic degradation of the one-way shape memory effect of NiTi alloys

2019 ◽  
Vol 26 (12) ◽  
pp. 1539-1550 ◽  
Author(s):  
Tian-xing Zhao ◽  
Guo-zheng Kang ◽  
Chao Yu ◽  
Qian-hua Kan
Keyword(s):  
Experimental Investigation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Niti Alloys ◽  
The One ◽  
Cyclic Degradation

Deposition of Pb(Zr,Ti)O3-Thin Films on Substrates with Shape Memory Effect

1999 ◽  
Vol 596 ◽  
Author(s):  
W. Biegel ◽  
R. Klarmann ◽  
M. Kuhn ◽  
B. Wörz ◽  
B. Stritzker
Keyword(s):  
Thin Films ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Ferroelectric Behavior ◽  
Ceramic Films ◽  
Pzt Films ◽  
The One ◽  
Film Substrate ◽  
La Doped

AbstractPulsed Laser Deposition (PLD) was used to deposit La-doped Pb(Zr,Ti)O3 (PZT) thin films onto NiTi foils. The substrate alloy with composition Ni50Ti50 shows a strong shape memory effect with a transition temperature of about 80°C. This simple bicomponental system could have the potential of an actuator device (NiTi shows a strain up to 5 % during thermal cycling) with an inherent sensorial component (PZT) for the generated elongation. The deposited ceramic films were characterized with respect to their structural properties (XRD) and their ferroelectric behavior (P-E hysteresis). Under certain deposition conditions the growth of pure perovskite PZT on the polycrystalline shape memory alloy was observed. The growth morphology of PZT on NiTi was compared to the one of PZT on single crystalline substrates whereas no distinctive texture of the films on NiTi could be found. The ferroelectric behavior of the PZT films depend on the stage of bending of the film-substrate compound.

Recent Advances in Materials Development for Emerging SMA Applications

2014 ◽  
Author(s):  
Alberto Coda ◽  
Andrea Cadelli ◽  
Francesco Butera
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Industrial Applications ◽  
Limiting Factors ◽  
Smart Devices ◽  
High Tech ◽  
Damping Capacity ◽  
Engineering Structures ◽  
Niti Alloys

Shape Memory Alloys (SMAs) are active metallic materials classified as “smart” or “intelligent” materials along with piezoelectric ceramic and polymers, electro-active plastics, electro-rheological and magneto-rheological fluids and others. SMAs show a multitude of different and dependent properties interesting for technological applications. These properties depend on the peculiar deformation mechanisms, accounting for the so-called shape memory effect. SMAs are nowadays used in quite different fields, like thermo-mechanical devices, anti-loosening systems, biomedical applications, mechanical damping systems, in some cases employed for large scale civil engineering structures. These multifunctional materials can be naturally considered as sensor-actuator elements demonstrating large possibilities for applications in high-tech smart systems. The use of SMAs in actuators offers an excellent technological opportunity to develop reliable, robust, simple and lightweight elements within structures or as stand-alone components that can represent an alternative to electro-magnetic actuators commonly used in several fields of industrial applications, such as automotive, appliances, consumer electronics and aerospace. NiTi-based SMAs demonstrated to have the best combination of properties, especially in terms of the amount of work output per material volume and the large amount of recoverable stress and strain. However, there are several limiting factors to a widespread diffusion of SMAs to technological fields. For instance, SMAs display a critical dependence of the shape-memory related properties, like transition temperatures, on their actual composition. For this reason, a great care in the production steps, mainly based on casting processes, is required. Another critical aspect, that is to be considered when dealing with SMAs, is the strong influence of their thermo-mechanical history on their properties. This may disclose interesting perspectives of application to smart devices in which different aspects of the shape memory phenomenology, like one and two way shape memory effect, pseudoelasticity, damping capacity, etc., are used. Last, but not least, one of the most debated aspects around NiTi alloys is microcleanliness. This concept is becoming increasingly important as the industrial market moves to smaller, lower profile devices with thinner structures. In this work a general overview about the peculiar behavior of NiTi alloys along with their main issues, the shape memory components under development, and the main efforts and directions for materials improvement will be presented and discussed. A bird’s-eye view on the future opportunities of NiTi-based shape memory actuators for industrial applications will also be given.

Two-way Antagonistic Shape Actuation Based on the One-way Shape Memory Effect

2008 ◽  
Vol 19 (9) ◽  
pp. 1017-1027 ◽  
Author(s):  
A.Y.N. Sofla ◽  
D.M. Elzey ◽  
H.N.G. Wadley
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
The One

scholarly journals Biomechanically Inspired Shape Memory Effect Machines Driven by Muscle like Acting NiTi Alloys

2016 ◽  
Vol 13 (11) ◽  
pp. 1264-1271 ◽  
Author(s):  
Raffaella Aversa ◽  
Francesco Tamburrino ◽  
Relly Victoria V. Petrescu ◽  
Florian Ion T. Petrescu ◽  
Mateus Artur ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Niti Alloys

Hysteresis modeling of two-way shape memory effect in NiTi alloys

Meccanica ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 165-172 ◽  
Author(s):  
A. Falvo ◽  
F. Furgiuele ◽  
C. Maletta
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Niti Alloys ◽  
Hysteresis Modeling

Use of 4D-printing and shape memory alloys to fabricate customized metal jewels with functional properties

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Adelaide Nespoli ◽  
Nicola Bennato ◽  
Enrico Bassani ◽  
Francesca Passaretti
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Functional Properties ◽  
Environmental Changes ◽  
Sample Surface ◽  
4D Printing ◽  
Additive Process ◽  
Content Type ◽  
The One

Purpose This paper aims to examine customized NiTi jewels with functional properties fabricated through four-dimensional (4D)-printing. Design/methodology/approach Two opened rings are fabricated through selective laser melting starting from 55.2Ni-Ti (wt.%) micrometric powder. After the additive process the two rings present the one-way shape memory effect (OWSME). A specific training is accomplished on one of the two printed rings to promote the two-way shape memory effect (TWSME). Both the samples, namely, the rings, respectively, presenting the OWSME and TWSME property, follow a series of post-processing routes to improve the surface finish. Furthermore, a thermal treatment at high temperature is used to create a thin colored oxide layer on the sample surface. Findings Results show that the change of shape owing to the OWSME and TWSME properties allows the customized 4D-printed rings to be adaptable to environmental changes such as load and temperature variations. This adaptability improves comfort and fit of the jewels. Originality/value To the best of the authors’ knowledge, in this work, first cases of additively manufactured NiTi jewels are reported to propose innovative solutions in the design and processing industry of jewels.

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