Constitutive Equations to Predict Stress‐Strain Behaviour for a β Titanium Alloy at High Strain Rates Over a Wide Range of Temperatures

Zhan, Hongyi; Gui, Weihua; Kent, Damon; Dargusch, Matthew

doi:10.1002/9781119296126.ch261

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…In order to acquire the JC and ZA material constants for the Ti-6Cr-5Mo-5V-4Al alloy, Split Hopkinson Pressure Bar (SHPB) experiments were carried out. The results from these experiments were used by the authors' research group in order to calculate the constants in the JC and ZA material models for the Ti-6Cr-5Mo-5V-4Al alloy [328]. The calculated JC and ZA parameters are listed in Table 2.…”

Section: Materials Constitutive Modelmentioning

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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Section: Materials Constitutive Modelmentioning

confidence: 99%

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

Zhan¹

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Multiscale modelling of the response of Ti-6AI-4V sheets under explosive loading

Kakogiannis

Verleysen

Belkassem

et al. 2018

International Journal of Impact Engineering

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Constitutive Equations to Predict Stress‐Strain Behaviour for a β Titanium Alloy at High Strain Rates Over a Wide Range of Temperatures

Cited by 2 publications

References 24 publications

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

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

Multiscale modelling of the response of Ti-6AI-4V sheets under explosive loading

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