Influence of strain rate and temperature on the compressive ductility of AI, Mg and Ti alloys

El-Magd, Essam; Abouridouane, Mustapha

doi:10.1051/jp4:20020663

Cited by 19 publications

(14 citation statements)

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“…Mukai et al [17] investigated the effect of grain size and observed that the ductility and tensile strength of the investigated magnesium alloy were increased at high rates of strain. El-Magd & Abouridouane [18] observed an increase in ductility for extruded AZ80 magnesium alloy under dynamic compressive loading. However, most of these high strain rate studies have concentrated on extruded magnesium alloys which usually have a different initial crystallographic texture compared with rolled sheets.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the effects of higher strain rate and sheet orientation on deformation mechanisms, yield strength and flow stress asymmetry and anisotropy are still unknown. The compression deformation studies carried out to date have dealt mostly with extruded and cast AZ and AM alloys [17,18]. It has been reported that ductility increases with increasing strain rate owing to an increase in the rate sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Kurukuri

Worswick

Tari

et al. 2014

Phil. Trans. R. Soc. A.

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The constitutive response of a commercial magnesium alloy rolled sheet (AZ31B-O) is studied based on room temperature tensile and compressive tests at strain rates ranging from 10 −3 to 10 3 s −1 . Because of its strong basal texture, this alloy exhibits a significant tension–compression asymmetry (strength differential) that is manifest further in terms of rather different strain rate sensitivity under tensile versus compressive loading. Under tensile loading, this alloy exhibits conventional positive strain rate sensitivity. Under compressive loading, the flow stress is initially rate insensitive until twinning is exhausted after which slip processes are activated, and conventional rate sensitivity is recovered. The material exhibits rather mild in-plane anisotropy in terms of strength, but strong transverse anisotropy ( r -value), and a high degree of variation in the measured r -values along the different sheet orientations which is indicative of a higher degree of anisotropy than that observed based solely upon the variation in stresses. This rather complex behaviour is attributed to the strong basal texture, and the different deformation mechanisms being activated as the orientation and sign of applied loading are varied. A new constitutive equation is proposed to model the measured compressive behaviour that captures the rate sensitivity of the sigmoidal stress–strain response. The measured tensile stress–strain response is fit to the Zerilli–Armstrong hcp material model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Kurukuri

Worswick

Tari

et al. 2014

Phil. Trans. R. Soc. A.

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“…This analysis, unlike the Fourier method, requires two out-of-phase measurements of the interference signal. If the relative phase between the two measurements is known, the absolute phase of the interference signal can be extracted by quadrature phase analysis [10]. The phase is unwrapped and the displacement of the reflecting surface is calculated through…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Recent estimates for the actual value of this constant are: κ 0.95 − 1.0, as discussed in [10] and [11], for example. It is clear from eq.…”

Section: Multi-step Loading Testsmentioning

confidence: 99%

Eliminating the thermal softening of dynamically loaded specimens in the Kolsky bar system by multi-step loading

Ashuach

Avinadav

Rosenberg

2012

EPJ Web of Conferences

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Abstract. We performed series of multi-step loading tests in our Kolsky bar system, and demonstrated that the thermal softening in strong aluminum alloys can be eliminated by multi-step loading. We showed that there is a significant difference in their stress-strain curves, compared with the result of a single shot test, due to adiabatic heating. The tests were carried out using our interferometry-based system, where the bar velocities are measured directly rather than the strains. The optical technique has several advantages over traditional strain gauge measurements; it is non-intervening, highly repeatable, and more accurate at low strains, thus allowing good estimation of the dynamic yield point in these experiments.

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“…Depending on the material composition and microstructural characteristics, DDRX and CDRX may coexist in wide Z ranges. The high temperature deformation and recrystallization mechanisms of Mg alloys at impact strain rates (~10 3 s _1 ) are currently not well understood, as significantly fewer studies have been carried out in this area [5,[30][31][32][33][34][35][36]. It is known that the CRSS of nonbasal systems decreases more slowly with temperature than under quasi-static conditions [5] and, thus, twinning is operative even at T>400°C [5,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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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Influence of strain rate and temperature on the compressive ductility of AI, Mg and Ti alloys

Cited by 19 publications

References 0 publications

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Eliminating the thermal softening of dynamically loaded specimens in the Kolsky bar system by multi-step loading

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

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