Tuning the stress induced martensitic formation in titanium alloys by alloy design

Li, C.; Chen, J. H.; Wu, Xiaomin; Wang, W.; Zwaag, Sybrand van der

doi:10.1007/s10853-012-6263-z

Cited by 44 publications

(29 citation statements)

References 26 publications

(33 reference statements)

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“…The factors are: (i) the stability of the b phase, i.e., the chemical composition of b phase, and (ii) b domain size (in our study it is defined as the remaining b surrounded by a before compression). These two aspects vary with the a phase fraction [24,25,28]. The authors of Refs.…”

Section: Formation Of Stress-induced a 00 Martensite And Correspondinmentioning

confidence: 99%

“…The authors of Refs. [24,25,28] reported that with an increasing amount of a, b phase becomes more stable while b domain size decreases. Both events oppose stress-induced a 00 martensite formation, as chemically stable b tends to hinder b !…”

Section: Formation Of Stress-induced a 00 Martensite And Correspondinmentioning

confidence: 99%

“…On the other hand, only two metastable b Ti alloys containing a phase, Ti-5Al-2Sn-5Zr-4Mo-2Cr-1Fe (b-Cez) [1,[20][21][22] and Ti-10V-2Fe-3Al [23][24][25][26][27][28], have been studied to understand the deformation mechanism operative in this type of metastable b. In such Ti-10V-2Fe-3Al alloy (wt.%), Duerig et al [23] mentioned that b phase transforms into a 00 martensite phase with orthorhombic structure upon tension.…”

Section: Introductionmentioning

confidence: 99%

“…Neelakantan et al [28] also explained that it becomes difficult to transform the b phase to martensite with increasing the a phase fraction in Ti-10V-2Fe-3Al alloy as increasing the a fraction increases b phase stability and decreases the effective b domain size. Li et al [24,29] has hypothesized that the alloy containing more than 50% of a phase does not transform into the a 00 martensite by external stress. It is pertinent to note that neither b deformation twinning nor stress-induced x was found in the aforementioned studies in Ti-10V-2Fe-3Al and b-Cez alloys.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The influence of β phase stability on deformation mode and compressive mechanical properties of Ti–10V–3Fe–3Al alloy

et al. 2015

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Section: Formation Of Stress-induced a 00 Martensite And Correspondinmentioning

confidence: 99%

Section: Formation Of Stress-induced a 00 Martensite And Correspondinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of β phase stability on deformation mode and compressive mechanical properties of Ti–10V–3Fe–3Al alloy

et al. 2015

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“…It has been demonstrated that for values of higher than 8 wt.%, the β phase will be in a metastable state and is likely to transform into α″ phase under applied stress [123]. A three step deformation sequence of martensitic transformation was established in previous studies [5].…”

Section: 2mentioning

confidence: 98%

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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The Modeling of the Flow Behavior Below and Above the Two‐Phase Region for Two Newly Developed Meta‐Stable β Titanium Alloys

Zhili

Zwaag

2020

Adv Eng Mater

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Isothermal hot compression tests of two promising new titanium alloys (Ti‐10 V‐1Fe‐3Al and Ti‐10 V‐2Cr‐3Al) are performed using a TA DIL805D deformation dilatometer at temperatures in and above the two‐phase α + β region (730–880 °C) at strain rates ranging from 10−3 to 10−1 s−1. Results show that the flow stress of the two alloys decreases with increasing deformation temperature and decreasing strain rate. Some of the flow curves manifest clear discontinuous yielding and flow softening, both of which are strongly affected by the deformation conditions. The flow stress behavior of these two alloys can be described very well by a hyperbolic–sine Arrhenius equation. When deforming in the α + β phase region, the deformation mechanism is governed by the bending or globularization of the α phase. When deforming in the pure β phase field, the flow behavior is mainly determined by dynamic recovery or recrystallization. The difference in alloy composition has a minor effect on their hot working behavior.

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Tuning the stress induced martensitic formation in titanium alloys by alloy design

Cited by 44 publications

References 26 publications

The influence of β phase stability on deformation mode and compressive mechanical properties of Ti–10V–3Fe–3Al alloy

The influence of β phase stability on deformation mode and compressive mechanical properties of Ti–10V–3Fe–3Al alloy

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

The Modeling of the Flow Behavior Below and Above the Two‐Phase Region for Two Newly Developed Meta‐Stable β Titanium Alloys

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