{332}〈113〉 Twinning system selection in a β-type Ti–15Mo–5Zr polycrystalline alloy

Min, Xiaohua; Tsuzaki, Kaneaki; Emura, Satoshi; Sawaguchi, Takahiro; Ii, S.; Tsuchiya, Koichi

doi:10.1016/j.msea.2013.04.119

Cited by 64 publications

(29 citation statements)

References 18 publications

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“…Using this convention, a variant whose SF is positive leads to an elongation along the tensile direction and will accommodate a tensile stress. SF analysis was successfully used to predict the activation of twinning systems [26,34,35] including {332}<113> in metastable  titanium alloys [18,36]. However, signs of normal to K 1 and  1 must be chosen carefully.…”

Section: Schmid Factor Analysismentioning

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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Section: Schmid Factor Analysismentioning

confidence: 99%

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

et al. 2016

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“…1.1b shows α″ phase within the twin. This phenomenon of secondary α″ transformation was also reported in β-Ti alloys undergoing high levels of strain [47,48].…”

Section: Microstructural Evolution Of β Titanium Alloys In the Processupporting

confidence: 70%

“…This twinning mode was first confirmed in the 1970s in a Ti-15Mo-6Zr-4Sn alloy (wt.%) [47]. It is considered as an important deformation mode in addition to the SIM transformation [35].…”

Section: Martensitic Transformation and Heat Treatments On  Titaniummentioning

confidence: 76%

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Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Yao-wu¹

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Fine tube stents are used for maintaining localised flow in stenotic blood vessels. Elasticity and plasticity for expansion, rigidity for resisting bending under force and strength to prevent unexpected failure, are required properties of the tubes from which these stents are formed. Biomedical metastable β titanium alloys have been developed as implant materials for a large number of biomedical applications due to a combination of favourable characteristics, e.g. good biocompatibility, excellent toughness and corrosion resistance. A metastable β alloy, Ti-25Nb-3Mo-3Zr-2Sn, has been developed without toxic alloying elements, which is a promising candidate material for stent applications. Metallic materials used for stents are commonly not biodegradable and implanted in the vessel permanently, which may provoke in-stent restenosis and stent thrombosis. In order to remove the implanted materials after service, biodegradable materials, absorbed by the body slowly, are also a field of research interest. Magnesium alloys have been used in studies for biomedical stent applications as a new biodegradable material. Magnesium stents can reopen the blocked blood vessels temporarily before degrading in physiological environments. In addition to the biodegradable characteristics, their mechanical properties are reasonable. The Mg-3Al-1Zn (AZ31) alloy is the subject of some research on the processing of biomedical magnesium alloys as it is a commonly available commercial alloy. Consequently, the Ti-25Nb-3Mo-3Zr-2Sn alloy and the AZ31 magnesium alloy have been used in this thesis to investigate the evolution of mechanical properties and microstructure in the processing of fine tubes.The deformation mechanisms during cold deformation of metastable β titanium alloys are mainly associated with martensitic phase transformations and mechanical twinning. It has been reported that stress-induced phase transformations and {112}〈111〉, {332}〈113〉 twinning modes may be activated under different stress states in metastable β titanium alloys. They can exhibit varying elasticity, Young's modulus and strain hardening behaviour. Because the martensitic start temperature is below room temperature for most metastable β titanium alloys, the α″ martensitic transformation can easily occur under a small amount of external stress. Mechanical twins were reported to hinder slip and dislocation motion thereby increasing the strain hardening rate. The development of β and α″ texture during processing is another critical influence on the mechanical properties of fine tubes. Therefore, studies on the martensitic transformation, mechanical twins and texture evolution is of significance in order to understand the processing of β titanium fine tubes.ii Magnesium alloys deform through the formation of a large amount of mechanical twins due to the relatively low critical stress to activate twinning in comparison with 〈 + 〉 slip. There are typically two primary mechanical twinning modes for magnesium alloys, {101 ̅ 2} extension twins and {101 ̅ 1} cont...

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“…It has been observed that the early-stage activation of stressinduced α" [279], ω phase transformations [300] and/or {332} <113> mechanical twinning [301] are related to lower yield stresses. Studies conducted by Sun et al [72] on a β Ti-12Mo alloy reported that dislocation-induced ω and α" phase transformations along with {332} <113> mechanical twinning take place at the very beginning of the deformation within true strains of around 0.007.…”

Section: Yield Behaviourmentioning

confidence: 99%

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

Zhan¹

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Titanium and its alloys fulfil a wide range of applications involving aerospace, biomedical, chemical and petroleum industries due to their extraordinary properties such as high specific strength, excellent biocompatibility and corrosion resistance. Among different types of titanium alloys, β titanium alloys have a unique range of properties such as an excellent combination of high strength and fracture toughness and low Young's modulus. Therefore, the usage of β titanium alloys in the manufacturing of some key components in aerospace and biomedical industries has continually increased in the past decade.Nowadays many commercial manufacturing processes for metallic materials such as machining, explosive welding, hot forging and extrusion employ high strain rates and are conducted at elevated temperatures. Also, high-strain-rate deformation can be encountered in collisions such as in car crashes, bird strikes on airplanes and micrometeorite impacts on space structures. Hence a large number of studies have been conducted on the dynamic response of metallic materials including copper, steels, tantalum, Ti-6Al-4V alloy and commercially pure titanium to high strain rates. Due to limited knowledge of the dynamic behaviour of β titanium alloys, this thesis mainly investigates the stress-strain behaviour and microstructural evolution of β titanium alloys under high strain rates at room and elevated temperatures.Split Hopkinson Pressure Bar compressive tests were carried out on two new types of β titanium alloys with different levels of β phase stability, the Ti-6Cr-5Mo-5V-4Al (wt. %) and Ti-25Nb-3Zr-3Mo-2Sn (wt.%) alloys, at strain rates ranging from 10 -3 s -1 to 10 4 s -1 and temperatures ranging from 293K to 1173K. The Ti-6Cr-5Mo-5V-4Al alloy, with relatively high β phase stability, represents an alloy type which can be engineered through heat treatment or thermo-mechanical processing to achieve a superior combination of strength and fracture toughness. While the Ti-25Nb-3Zr-3Mo-2Sn alloy with relatively low β phase stability represents an alloy type which can be applied in biomedical applications due to their low Young's modulus and superelastic properties.For the Ti-6Cr-5Mo-5V-4Al alloy, dislocation slip is dominant at all testing strain rates and temperatures in this research. The flow stress increases with increasing strain rate but decreasing temperature. Also, it is more sensitive to temperature than strain rate. At ambient temperatures, the strain hardening rate exhibited by the Ti-6Cr-5Mo-5V-4Al alloy at high strain rates is much lower than that at quasi-static strain rates, which is attributed to the thermal softening effect brought byHongyi Zhan II The University of Queensland adiabatic heating. While for the Ti-25Nb-3Zr-3Mo-2Sn alloy, multiple deformation mechanisms including dislocation slip, {332} <113> and {112} <111> mechanical twinning, stress-induced martensitic α" and ω phase transformations can be activated simultaneously and among them {332} <113> twinning is dominant at 293K regardless of...

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{332}〈113〉 Twinning system selection in a β-type Ti–15Mo–5Zr polycrystalline alloy

Cited by 64 publications

References 18 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

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

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