Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature

Dudamell, N.V.; Ulacia, I.; Gálvez, Francisco; Yi, Sangbong; Bohlen, Jan; Letzig, Dietmar; Hurtado, I.; Pérez‐Prado, M.T.

doi:10.1016/j.actamat.2011.07.047

Cited by 183 publications

(71 citation statements)

References 57 publications

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“…The volume fraction of twinned material is 72%. This value is slightly lower than that observed for similar strains at low strain rates and room temperature (86%, [38]), but still very high. Twinning results in a lattice rotation of 86° around the (11 -20) axis, giving rise to a characteristic texture, formed by two maxima parallel to the RD in the (0001) pole figure and to a maximum parallel to the ND in the (10-10) pole figure.…”

Section: Resultscontrasting

confidence: 40%

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Dudamell

Ulacia

Gálvez

et al. 2011

Materials Science and Engineering: A

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An AZ31 rolled sheet alloy has been tested at dynamic strain rates (e~10 3 s _1 ) at 250°C up to various intermediate strains before failure in order to investigate the predominant deformation and restoration mechanisms. In particular, tests have been carried out in compression along the rolling direction (RD), in tension along the RD and in compression along the normal direction (ND). It has been found that dynamic recrystallization (DRX) takes place despite the limited diffusion taking place under the high strain rates investigated. The DRX mechanisms and kinetics depend on the operative deformation mechanisms and thus vary for different loading modes (tension, compression) as well as for different relative orientations between the loading axis and the c-axes of the grains. In particular, DRX is enhanced by the operation of (c + a) slip, since cross-slip and climb take place more readily than for other slip systems, and thus the formation of high angle boundaries is easier. DRX is also clearly promoted by twinning.

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Section: Resultscontrasting

confidence: 40%

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Dudamell

Ulacia

Gálvez

et al. 2011

Materials Science and Engineering: A

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“…New Developments in Wire Production and Processing broad compared to compression twins [20], occurring due to the limited number of activated slip systems at a testing temperature of 250 °C and 5 s −1 strain rate could be confirmed. The flow curves with 5 s −1 as well as 1 s −1 strain rate at 250 °C are characterised by a concave shape typical for magnesium, as mechanical twinning initially contributes to deformation and following high levels of work hardening begin to increase the yield stress with progressing strain [21].…”

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confidence: 87%

Influence of Deformation Controlled Strain Rate on Tensile and Compression Behaviour of Magnesium and Steel Wire

Henseler¹,

Ullmann²,

Korpała³

et al. 2017

MSF

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Abstract. This article demonstrates the difference in the flow curves of an AZ31 magnesium alloy and S235JR structural steel wire caused by non-linear strain rates during uniaxial tensile and compression testing at elevated temperatures. Throughout tensile deformation, the traverse velocity of the testing machine has to be adapted according to the current elongation of the specimen, thus accelerating, to ensure a constant strain rate during the admission of the stress-strain curve. The equivalent is necessary during compression testing, where the traverse velocity of the testing machine needs to decelerate ensuring a constant strain rate. Nevertheless, tensile and compression tests are performed with constant traverse velocity, which lead to divergent flow curves in comparison to deformation controlled traverse velocities. The results of the research show the difference in flow behaviour of magnesium and steel wire, when the temperature and strain rate are varied in conjunction with constant and deformation controlled traverse velocities.

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“…In the Mg AZ31 alloy, {101 ̅ 2} extension twin nucleation and propagation were reported to be dramatically enhanced at high strain rates [170]. In pure titanium, {112 ̅ 4} twinning, absent in quasi-static conditions, was activated in high strain rate deformations [173].…”

Section: Precipitation Phase Transformation and Mechanical Twinningmentioning

confidence: 99%

“…According to Dudamell et al [170], thermal activation is critical for dislocation rearrangement. This explains that why high strain rates have adverse influence on the dislocation rearrangement and retard dynamic recovery.…”

Section: Constitutive Models For Titanium Alloysmentioning

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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Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature

Cited by 183 publications

References 57 publications

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Influence of Deformation Controlled Strain Rate on Tensile and Compression Behaviour of Magnesium and Steel Wire

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

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