Effects of strain rates on deformation twinning behavior in α-titanium

Wang, Tongbo; Li, Bolong; Li, Mian; Li, Yingchao; Wang, Zhenqiang; Nie, Zuoren

doi:10.1016/j.matchar.2015.05.016

Cited by 49 publications

(10 citation statements)

References 26 publications

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“…In addition to temperature [23,24], it is well known that deformation mode of HCP metals and alloys can be significantly influenced by strain rate [24,25]. However, studies on the deformation twinning behavior of Ti at high strain rates are less [26][27][28][29][30][31]. It has been found that the twining mode of Ti may be changed by the high strain rate deformation.…”

Section: Introductionmentioning

confidence: 99%

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Revealing abnormal {112¯1} twins in commercial purity Ti subjected to split Hopkinson pressure bar

Jia

Marthinsen

2019

Journal of Alloys and Compounds

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A commercial purity (CP) Ti alloy was subjected to high strain rate (~600 s −1) compression deformation using a split Hopkinson pressure bar (SHPB) system. By multi-impacts, an accumulative deformation strain of ~0.15 was achieved. The microstructural evolution has been systematically analyzed by electron backscatter diffraction (EBSD). It is found that the CP-Ti alloy has been deformed predominantly by three different twinning modes, {101 _ 2} (T1), {112 _ 1} (T2) and {112 _ 2} (C1). A large fraction of the {112 _ 1} (T2) twin boundary (TB) segments are found to be in connection with deformation band (DB) boundary segments with misorientation angles much lower than the theoretical value of the {112 _ 1} (T2) TB, ~35˚. Based on the analysis of the crystallographic nature of these abnormal {112 _ 1} (T2) TBs and the calculation of Schmid factor, it is suggested that these abnormal {112 _ 1} (T2) TBs are evolved from DB boundaries through the accumulative slip of single basal-〈a〉 dislocations, namely a kinking mechanism. This special twinning mode of the {112 _ 1} (T2) twin has been attributed to the high strain rate deformation during SHPB compression.

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Section: Introductionmentioning

confidence: 99%

“…The deformation twins formed in CP-Ti subjected to split Hopkinson pressure bar (SHPB) under different strain rates of 10 3 -10 4 s -1 have also been investigated [31]. It was demonstrated that the quantity of deformation twins at high strain rates was higher than that at low to medium strain rates.…”

Section: Introductionmentioning

confidence: 99%

Revealing abnormal {112¯1} twins in commercial purity Ti subjected to split Hopkinson pressure bar

Jia

Marthinsen

2019

Journal of Alloys and Compounds

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“…In pure titanium, {112 ̅ 4} twinning, absent in quasi-static conditions, was activated in high strain rate deformations [173]. In experiments conducted on commercial pure titanium [174], the volume fraction of {112 ̅ 2} twinning increased with increasing strain rate while the volume fraction of {112 ̅ 1} twinning decreased slightly. This twin-type selection behaviour was attributed to the twinning energy and short time of deformation.…”

Section: Constitutive Models For Titanium Alloysmentioning

confidence: 99%

Section: Constitutive Models For Titanium Alloysmentioning

confidence: 99%

“…In addition, the matrix reorientation by twinning will also change the tendency for the activation of slip systems. Wang et al [174] suggested that as the grains around the {101 ̅ 2} extension twin have a high Schmid factor for {101 ̅ 1}<112 ̅ 3> slip system, an increase in the volume fraction of {101 ̅ 2} extension twinning will stimulate more extensive activation of this slip system in deformed samples.Furthermore, the review on the influence of strain rate on substructure evolution by Gray et al [177] concluded that dislocation slip and deformation twins are two competing deformation modes and the latter form more readily as temperature decreases or strain rate increases. Also, the high stresses and dislocation jog movement, enhanced by high strain rates during shock loading, will lead to an increased production of point defects in the matrix.…”

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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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Misorientation characteristics and textural changes induced by dense twins in high-purity Ti sheet after small strain rolling

Dai

Zeng²,

Li³

et al. 2019

Sci. China Technol. Sci.

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Effects of strain rates on deformation twinning behavior in α-titanium

Cited by 49 publications

References 26 publications

Revealing abnormal {112¯1} twins in commercial purity Ti subjected to split Hopkinson pressure bar

Revealing abnormal {112¯1} twins in commercial purity Ti subjected to split Hopkinson pressure bar

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

Misorientation characteristics and textural changes induced by dense twins in high-purity Ti sheet after small strain rolling

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