Shape memory alloys: Properties and biomedical applications

Mantovani, Diego

doi:10.1007/s11837-000-0082-4

Cited by 217 publications

(124 citation statements)

References 64 publications

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“…In the superelastic effect, the transformation occurs between the austenitic phase and the stress-induced martensitic phase due to the loading and unloading cycle. The recoverable strain for a mono-crystalline sample of SMA can reach 10% [52]. The superelastic effect is illustrated by the mechanical cycle shown in Figure 3.9.…”

Section: Pseudoelasticitymentioning

confidence: 96%

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Yang

Tieu

Dunne

et al. 2009

Wear

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AcknowledgementsFirst and foremost, I would like to thank my principal supervisor, Professor A. Kiet.Tieu., for providing timely and insightful advice, financial and spiritual support. My supervisor's implicit trust in my research abilities not only allowed me to freely pursue my goals, but also gave me an opportunity to learn how to manage time and allocate resources. Special thanks go to Professor Druce Dunne, for his insightful instruction and for all the generous attention and time he devoted to my research work. Tables Table 5. List of List of Figures AbstractThe objective of this work was to produce near-equiatomic NiTi thin films by filtered arc deposition system (FADS) to improve the cavitation erosion resistance of a steel base working in liquid. First, deposition conditions were optimized in order to obtain near-equiatomic NiTi films. Energy dispersive spectroscopy (EDS) was used to measure the composition of films. It was found that both the substrate bias voltage and arc current affect the compositions of as-deposited NiTi films. X-ray diffractometry (XRD) and transmission electron microscopy (TEM) were used to investigate the microstructures of Ni-rich, Ti-rich and near-equiatomic films. Their thermal behaviours were tested using differential scanning calorimetry (DSC). Atomic force microscopy (AFM), ultra micro-indentation system (UMIS) and Romulus scratch testing were used to measure the roughness, hardness and adhesive force of a near-equiatomic thin film.The cavitation erosion resistance of the near-equiatomic NiTi film was assessed using ASTM Test Method G32. It was found that NiTi thin films showed significantly higher cavitation erosion resistance than 316 austenitic stainless steel. The improved cavitation erosion resistance was attributed to the recoverable deformation associated with pseudoelasticity of the NiTi thin film.The effect of substrate temperature on the properties of NiTi thin films was investigated by preheating substrates to different temperatures (130 C, 300 C, 430 C and 600 C). temperature of 600 C was more resistant to cavitation erosion than films deposited at other bias voltages with a similar substrate temperature.The effect of substrate material on the properties of NiTi thin films was investigated by comparing films on mild steel and on austenitic stainless steel. For similar deposition conditions, the NiTi film deposited on mild steel consisted of B2, B19' and R phases, while the NiTi film on stainless steel was dominated by B2 parent phase. This is probably because the lower thermal conductivity of austenitic stainless steel resulted in a higher deposition temperature.The dominance of the B2 phase for deposition with a high substrate temperature, a high bias voltage and the use of stainless steel substrate was not found to be due to Ni-enrichment of the films, but is consistent with stabilization of the parent phase by possible pick-up oxygen and nitrogen from the chamber atmosphere when the deposition temperature is high.The research program successfully pro...

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Section: Pseudoelasticitymentioning

confidence: 96%

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Yang

Tieu

Dunne

et al. 2009

Wear

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“…Of the two metal elements in NiTi alloys, titanium is well recognized to be biocompatible with superb long-term corrosion resistance. In contrast to Ti, Ni release from the surface of NiTi implants has been a concerning issue because the dissolution and concentration of Ni ions or wear debris above a certain amount causes some allergic reaction and biocompatibility problems including pneumonia, chronic sinusitis and rhinitis, nostril and lung cancer for patients (Mantovani 2000;Kapanen, Ryhanen et al 2001;Machado and Savi 2003). However, most of in vivo studies of NiTi implantation and in vitro experiments exhibited good biocompatibility of this material (Castleman, Motzkin et al 1976;Ryhaenen, Kallioinen et al 1998;Kapanen, Ryhanen et al 2001).…”

Section: Biocompatibility Of Nitimentioning

confidence: 99%

NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Bahraminasab¹,

Sahari²

2013

Shape Memory Alloys - Processing, Characterization and Applications

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“…As ligas com memória de forma (Shape Memory Alloys -SMA) apresentam um enorme potencial de aplicação em diversas áreas da engenharia e da medicina [2,[4][5][6]. Desde as primeiras aplicações das SMA pesquisa-se formas de aprimorar suas propriedades termomecânicas [5,8].…”

Section: Introductionunclassified

INFLUÊNCIA DO TEMPO DE ENCHARQUE CRIOGÊNICO NO AMORTECIMENTO DE UMA LIGA Ni43Ti57 (wt%) COM MEMÓRIA DE FORMA

Castilho¹,

Lopes²,

Silva³

2018

ABM Proceedings

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ResumoA influência do tempo de encharque criogênico no amortecimento da liga Ni-43,9%Ti foi investigada. Por meio da técnica de excitação por impulso determinou-se essa propriedade de amostras submetidas a diferentes tempos de encharque criogênico a -196 o C. Observou-se que o amortecimento sofreu aumento de até 119% para corpo de prova submetido ao encharque criogênico por 24 horas. Palavras-chave: Ligas com memória de forma; Tratamentos criogênicos; NiTi. INFLUECE OF THE CRYOGENIC SOAKING TIME ON THE DAMPING OF Ni43Ti57 (wt%) SHAPE MEMORY ALLOY AbstractThe influence of cryogenic soaking time on the damping of the Ni-Ti 43.9% was investigated. By means of the impulse excitation technique this property of was measured for samples submitted to different cryogenic soaking time at -196 o C. It was observed that the damping increased up to 119% for the sample subjected to the cryogenic soaking time of 24 hours.

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Shape memory alloys: Properties and biomedical applications

Cited by 217 publications

References 64 publications

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

INFLUÊNCIA DO TEMPO DE ENCHARQUE CRIOGÊNICO NO AMORTECIMENTO DE UMA LIGA Ni43Ti57 (wt%) COM MEMÓRIA DE FORMA

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