Deformation-induced martensitic transformation in a new metastable β titanium alloy

Sadeghpour, Saeed; Abbasi, S.M.; Morakabati, M.

doi:10.1016/j.jallcom.2015.07.263

Cited by 78 publications

(25 citation statements)

References 27 publications

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“…Then, superelasticity is generally obtained by a stress-induced martensitic transformation from the  phase into the C-centered orthorhombic '' martensite. From the fundamental point of view, deformation of these alloys involves numerous mechanisms such as stress-induced martensitic transformation [2,4,[11][12][13][14][15][16], twinning [5,[17][18][19][20] and dislocation slip [21][22][23][24] that have been widely studied.…”

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confidence: 99%

Deformation twinning in the full-α″ martensitic Ti–25Ta–20Nb shape memory alloy

et al. 2016

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International audienceDeformation twinning of the Ti–25Ta–20Nb (mass%) shape memory alloy is characterized using EBSD and TEM. The selfaccommodating α″ microstructure is shown to be first deformed using \111\α″ type I and <211>α″ type II reorientation twinning. Plastic deformation occurs further by plastic twinning with a new \130\<310>α″ twinning system. Maximum lattice deformation calculation is a relevant parameter to predict the variant of martensite that is favored during the reorientation process. Conversely, Schmid factor analysis can be used to predict the selection of \130\<310>α″ twinning variants during deformation. Analogy between \130\<310>α″ and \332\<113>β twinning systems is highlighte

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confidence: 99%

Deformation twinning in the full-α″ martensitic Ti–25Ta–20Nb shape memory alloy

et al. 2016

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“…티타늄 합금은 경량 금속으로 비강도가 높고, 탄성 계수 가 낮을 뿐 아니라, 우수한 생체 적합성과 내부식성을 가 지기 때문에 항공 우주, 생의학 및 화학 산업에서 널리 사 용되고 있다 [1][2][3][4]. 특히, 초탄성 (superelastic) 티타늄 합 금은 일반 금속재료에서는 소성 변형이 될 정도로 대변형 이 발생하여도 하중을 제거하면 고무와 같이 원래의 초기 상태로 되돌아오는 초탄성 거동을 보이기 때문에, 최근 생 체 재료나 고급 구조용 재료로 많이 응용되고 있다 [5,6].…”

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A Study on Uniaxial Tensile Deformation Behavior of Superelastic Titanium Alloy

Jeong¹,

Luu²,

Jeong³

et al. 2020

Korean J. Met. Mater.

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A superelastic titanium alloy was subjected to uniaxial tensile deformation at room temperature. The microstructural evolution and deformation mechanisms of the superelastic titanium alloy were investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Multiple deformation mechanisms including stress-induced martensitic transformation (SIMT), dislocation slip, {332}<113> and {112}<111> mechanical twinning were identified with the increase in uniaxial strain. In the early stage of deformation, a SIMT from the bcc beta phase to orthorhombic martensite phase dominantly occurred. As the deformation proceeded, the phase fraction of the remained martensite which did not return to beta phase obviously increased due to dislocation slip and mechanical twinning. The kernel average misorientation (KAM) value obtained from EBSD data gradually increased with increasing the deformation, indicating that the dislocation evolution was produced by slip. This was well matched with the trend in the full width at half maximum (FWHM) value of the peak profile obtained from XRD data. In addition, the fraction of the {332}<113> twin was lower than that of the {112}<111> twin in the initial specimen. However, the {332}<113> twin rapidly increased compared to the {112}<111> twin as deformation increased. Therefore, it is confirmed that {332}<113> twinning and dislocation slip were the dominant mechanisms during plastic deformation.

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“…The appearance of orthorhombic α′′ martensite phase in 3D printed Ti-6Al-4V alloy samples produced by electron beam melting [22] or selective laser melting [23] is typically explained by the concentration of β-stabilizer in the β phase. Nevertheless, the appearance of strain-induced α′′ phase from the β phase has been observed in Ti-6Al-4V alloy failed by adiabatic shear [24] or in some β-metastable titanium alloys (e.g., TiNbTaZr alloy [25], TiAlMoVCr [26]) subjected to less severe deformation (e.g., cold rolling or compression test).…”

Section: Microstructurementioning

confidence: 99%

Continuous Electron Beam Post-Treatment of EBF3-Fabricated Ti–6Al–4V Parts

Panin

Kazachenok

Перевалова

et al. 2019

Metals

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In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti–6Al–4V parts during an EBF3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized β grains and an orthorhombic martensite α″ phase at the secondary α lath boundaries of as-built Ti–6Al–4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF3-fabricated Ti–6Al–4V parts was revealed. The brittle outermost surface layer of the EBF3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior β grains of 20 to 30 μm in size with the fragmented acicular α′ phase. Electron-beam irradiation induced transformations within the 70 μm thick molten surface layer and 500 μm thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF3-fabricated Ti–6Al–4V samples.

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Deformation-induced martensitic transformation in a new metastable β titanium alloy

Cited by 78 publications

References 27 publications

Deformation twinning in the full-α″ martensitic Ti–25Ta–20Nb shape memory alloy

Deformation twinning in the full-α″ martensitic Ti–25Ta–20Nb shape memory alloy

A Study on Uniaxial Tensile Deformation Behavior of Superelastic Titanium Alloy

Continuous Electron Beam Post-Treatment of EBF3-Fabricated Ti–6Al–4V Parts

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