A study on the mechanical behavior and microstructural evolution of Ni60wt%–Ti40wt% (60Nitinol) intermetallic compound during hot deformation

Khamei, A.A.; Dehghani, K.

doi:10.1016/j.matchemphys.2010.04.010

Cited by 40 publications

(16 citation statements)

References 11 publications

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“…According to the Ti-Ni phase diagram, the Ni 3 Ti phase can precipitate out mainly during cooling from the casting and/or cooling from the two-phase region after hot working. [19] Ni 3 Ti precipitate forms on both the grain boundaries and within the matrix. In the former case, it exhibits a blocky morphology.…”

Section: Microstructural Developmentmentioning

confidence: 99%

Microstructural Evolution During the Hot Deformation of Ti-55Ni (at. pct) Intermetallic Alloy

Khamei¹,

Dehghani²

2010

Metall Mater Trans A

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The hot deformation behavior of Ti-55Ni (at. pct) alloy was studied using compression testing at 1173 K (900°C) to 1323 K (1050°C) and at the strain rates of 0.001 to 0.35 s À1 . The microstructure evolution was characterized using optical and scanning electron microscopy (SEM). The influences of hot-working parameters on the flow stress and microstructural features of this alloy were then analyzed. The results indicate that, depending on the temperature and strain rate, the dynamic recrystallization (DRX) is the dominate mechanism. Besides, the particle-stimulated nucleation (PSN) mechanism could partially recrystallize the structure. The PSN phenomenon is of significant importance for the Ti-55Ni (at. pct) that suffers from insufficient workability because of its high content of intermetallic phases. It is of interest that the discontinuous yielding phenomenon has been observed when the specimens were deformed at 1173 K (900°C). Finally, the optimum parameters for hot working of Ti-55Ni (at. pct) alloy are determined as well.

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Section: Microstructural Developmentmentioning

confidence: 99%

Microstructural Evolution During the Hot Deformation of Ti-55Ni (at. pct) Intermetallic Alloy

Khamei¹,

Dehghani²

2010

Metall Mater Trans A

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“…2), as a result of the annealing process and low cooling rate, which allowed the large scale diffusion process. 13 The microstructure of the sample under condition no. 3 (after quenching), shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Effect of heat treatment on microstructure and mechanical properties of Ti–5wt-%Ni alloys for use as biomaterial

Cascadan

Buzalaf

Grandini

2014

International Heat Treatment and Surface Engineering

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Titanium alloys are among the most important and frequently used class of biomaterials. In addition to biocompatibility, it is important that an implant material present satisfactory mechanical properties that allow long term use in the body. To improve such properties, different heat treatments are used, as well as doping with oxygen. The presence of interstitial oxygen in the crystal lattice causes deformation, increases the hardness, and causes modifications in anelasticity, thereby decreasing the elastic modulus. In this study, an alloy was prepared by arc melting precursor metals, heat and mechanically treated, and doped with oxygen, resulting in samples with different processing conditions. In each condition, the alloy was characterised in terms of amount of oxygen, X-ray diffraction, and optical microscopy. In addition, properties of the alloy, such as hardness and elastic modulus, were analysed.

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“…Para obter as micrografias, as amostras foram preparadas de acordo com o processo metalográfico padrão [24].…”

Section: Materiais E Métodosunclassified

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 study on the mechanical behavior and microstructural evolution of Ni60wt%–Ti40wt% (60Nitinol) intermetallic compound during hot deformation

Cited by 40 publications

References 11 publications

Microstructural Evolution During the Hot Deformation of Ti-55Ni (at. pct) Intermetallic Alloy

Microstructural Evolution During the Hot Deformation of Ti-55Ni (at. pct) Intermetallic Alloy

Effect of heat treatment on microstructure and mechanical properties of Ti–5wt-%Ni alloys for use as biomaterial

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

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