A new look at biomedical Ti-based shape memory alloys

Biesiekierski, Arne; Wang, James; Gepreel, Mohamed Abdel‐Hady; Wen, Cuié

doi:10.1016/j.actbio.2012.01.018

Cited by 547 publications

(232 citation statements)

References 75 publications

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“…Tantalum is an alloy additive which will decrease the temperature of the martensite transformation, which -as a result -causes the expansion of the scope of the β phase in titanium-based alloys. The research has also confirmed that the addition of tantalum can inhibit the occurrence of undesirable phases such as the ω metastable phase [3,4]. The corrosion resistance of the Ti-Ta alloys is higher than the corrosion resistance of pure titanium or titanium-based alloys currently used in medicine [5].…”

Section: Introductionmentioning

confidence: 78%

“…• C) and significant difference in the density of pure elements (Ti: 4.51 g/cm 3 , Ta: 16.6 g/cm 3 ), which can be the reason, among others, for the presence of component high segregation confirmed by current literature reports [9]. Results of the research carried out by Liu et al into the synthesis of Ti-Ta alloys using the powder metallurgy (PM) have shown that the material is heterogeneous with distinct zones enriched in the output elements regardless of the alloy composition and the temperature of the synthesis [9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of High Energy Milling Time on the Ti-50Ta Biomedical Alloy Structure

et al. 2016

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Nickel-free titanium alloys are a promising research direction in the field of biomedical materials. Current literature reports indicate that there is a possibility of using the Ti-Ta alloys in medicine since these alloys have had satisfactory results as far as biocompatibility, resistance to corrosion and mechanical properties are concerned, which is an important aspect while considering the use of this alloy for long-lasting bone implants. This article presents the results of a high-energy milling process with the use of Ti and Ta powders. The ball-milling process was carried out for various times, including 20, 40, 60, 80, and 100 h. The samples were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The research confirmed partial synthesis of the materials during the process of high energy ball milling.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Influence of High Energy Milling Time on the Ti-50Ta Biomedical Alloy Structure

et al. 2016

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“…Possible generally accepted solution for this problem is the development of low modulus titanium alloys comprised of "vital" elements (Nb, Ta, Zr, with Ti as balance) and exhibiting shape memory and superelasticity effect resulting from reversible β to α'' martensitic transformation [7][8][9][10][11][12]; Ti-Nb-based alloys in particular [for example, [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization of oxidized nanostructured superelastic Ti-Nb-Zr alloy for medical implants

Zhukova

Pustov

Sheremetyev

et al. 2015

MATEC Web of Conferences

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Abstract. Metastable Ti-Nb-based shape memory and superelastic alloys are known to be strong candidates for bone implant applications. The issues of the materials' biochemical and biomechanical compatibility and its characterization are reviewed. Thermomechanical treatment is conventionally applied to these alloys in order to obtain supreme functional properties; the processing scheme comprises cold rolling and post-deformation air annealing. The structure and electrochemical characteristics of annealing-induced oxide films were studied by scanning electron microscopy, open circuit potential measurement and voltammetry. It is shown that the samples after the annealing treatment exhibit higher steady-state potential value and lower anodic dissolution current density in simulated biological solution, compared with the samples with mechanically removed oxide films. At the same time, the samples with thermal oxide films exhibited lower rate of passive layer recovery than those subjected to mechanical renewal of the oxidized surface. This fact underlies the recommendation to remove the annealing-induced oxide film from the implants operating under friction conditions.

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“…Este material satisfaz em maior grau os requisitos e adicionalmente apresenta características superiores que permitem o longo tempo de uso do material no corpo, incluindo efeito memória de forma e superelasicidade, além de biocompatibilidade por curtos períodos de tempo e boas propriedades de corrosão, com propriedades similares (baixo módulo de Young, resistência à fadiga e ductibilidade) e até mesmo superiores às do aço inoxidável, ligas Co-Cr, Ti-Al-V e Ti-cp [4]. Apesar do níquel apresentar diversas reações adversas no organismo tais como efeitos carcinogênicos, genotóxico, mutagênico, citotóxico, alérgicos dentre outros [16], contudo, testes de corrosão simulando ambientes naturais no organismo mostraram que ligas Ti-Ni (54,5-57%pNi) apresentaram liberação de níquel em níveis seguros, muito inferior à ingestão humana diária 17; 18 , além dos testes de biocompatibilidade in vitro e in vivo com resultados positivos [19,20].…”

Section: Introductionunclassified

Influência de tratamentos termo-mecânicos na estrutura e microestrutura da liga Ti-10%pNi obtida por fusão a arco

Cascadan

Grandini

2015

Matéria (Rio J.)

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RESUMOLigas de titânio representam uma importante classe de biomateriais. Além da questão da biocompatibilidade, é muito importante considerar as propriedades mecânicas de um biomaterial, que são diretamente relacionadas com a microestrutura e quantidade de elementos intersticiais presentes. No presente trabalho, a liga Ti-10%pNi foi produzida a partir da fusão dos metais titânio e níquel comercialmente puros, num forno de arco sob uma atmosfera de argônio. Em seguida, foi realizado um tratamento térmico e a amostra foi laminada. Para comprovar a composição da liga, foi realizada análise química quantitativa. A estrutura e microestrutura da liga produzida foram analisadas por difração de raios-x, microscopia óptica e microscopia eletrônica de varredura. Os resultados mostram que a liga apresenta predominantemente a fase alfa do titânio (estrutura hexagonal compacta), com precipitados lamelares proeutetóide numa matriz eutetóide composta de fase alfa e do intermetálico Ti2Ni. Palavras-chave: Liga de titânio, microestrutura, propriedades mecânicas, processamento. ABSTRACTTitanium alloys are an important class of biomaterials. Apart from the issue of biocompatibility, is very important to consider the mechanical properties of a biomaterial, which are directly related to the microstructure and interstitial elements quantity present. In the present paper, Ti-10wt%Ni was produced from the melting of commercially pure titanium and nickel in arc furnace under argon atmosphere. Then a heat treatment was carried out and the sample was hot-rolled. To prove the alloy composition, quantitative chemical analysis was performed. The structure and microstructure of the produced alloy were analyzed by x-ray diffraction, optical and scanning electron microscopy. The results show that the alloy presents predominantly titanium alpha phase (hexagonal compact structure), with proeutectoid lamellar precipitates in eutectoid matrix of alpha phase and intermetallic Ti2Ni. Keywords: Titanium alloy, microstructure, mechanical properties, processing. INTRODUÇÃOA pesquisa sobre novos biomateriais é de fundamental importância, pois com o aumento e envelhecimento da população mundial, a demanda tem aumentado substancialmente [1]. Neste sentido, o titânio e suas ligas têm sido muito utilizados como materiais biomédicos, em função da alta resistência à corrosão, ótima relação resistência mecânica/densidade e excelente biocompatibilidade [2,3] Ligas de titânio usadas tradicionalmente em próteses, como Ti-6Al-4V, apresentam falhas como liberação de íons tóxicos e propriedades mecânicas não muito satisfatórias como módulo elástico alto (cerca de 112 GPa) em comparação com o do osso (cerca de 30 GPa) devido à sua microestrutura do tipo α + β [4,5]. No caso de implantes ortopóedicos, ligas com microestrutura β são mais apropriadas devido ao menor módulo elástico, cerca de 60-80 GPa [2].No entanto, ligas de titânio com fase α, apesar de apresentarem maior módulo elástico, apresentam melhor oxidação, resistência à corrosão e soldabilidade, comparado co...

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A new look at biomedical Ti-based shape memory alloys

Cited by 547 publications

References 75 publications

Influence of High Energy Milling Time on the Ti-50Ta Biomedical Alloy Structure

Influence of High Energy Milling Time on the Ti-50Ta Biomedical Alloy Structure

Electrochemical characterization of oxidized nanostructured superelastic Ti-Nb-Zr alloy for medical implants

Influência de tratamentos termo-mecânicos na estrutura e microestrutura da liga Ti-10%pNi obtida por fusão a arco

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