Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Xue, Song; Yang, Tao; Liu, Xuedong; Ren, Yi; Peng, Yi; Zheng, Lixuan

doi:10.3390/met12071103

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…The maximum texture intensity was 54.83 and 50.62 MUD at a pulse current of 0 and 100 A, respectively; the texture intensity decreased significantly, which were 21.01 and 19.84 MUD at a pulse current of 200 and 300 A, respectively. Li et al [39] and Wu et al [40] found that when the temperature exceeded 350 °C, the stress-strain curves of AZ31 and AZ61 Mg alloys show a large steady-state region, which promoted complete dynamic recrystallisation. Because of the low stacking fault energy of magnesium alloys, dynamic recrystallisation readily occurred during the thermal deformation and resulting in more randomised texture distribution.…”

Section: Effect Of Pulse Current On Texturementioning

confidence: 99%

Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)

Wang

Liu

Yuan

et al. 2023

Science and Technology of Welding and Joining

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The dissimilar AZ31B/AZ61 Mg alloy joints were fabricated by pulse current-assisted friction stir welding (PCaFSW). The maximum tensile strength and elongation were 314.28 MPa and 13.66%, respectively. A micro interlocking structure was formed and the grain refinement effect was enhanced by the PCaFSW process, which was improved relative to that in the conventional FSW. The enhanced strength and plasticity with increasing pulse current were attributable to the grain refinement, weakening of texture strength, formation of nano-scale precipitates and increase of short dislocation lines. The fracture mode was transformed from a brittle fracture mode to a combined fracture mode of brittle and ductile fractures.

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Section: Effect Of Pulse Current On Texturementioning

confidence: 99%

Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)

Wang

Liu

Yuan

et al. 2023

Science and Technology of Welding and Joining

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Varying strain rates and elevated temperatures effects on the mechanical properties of AZ31B magnesium alloy

Kumar,

Mursaleen,

Harmain

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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This study investigates the monotonic tensile behavior of magnesium (Mg) alloy AZ31B across a temperature range from ambient (25 °C) to elevated (up to 300 °C) with varying strain rates (SR) (1.5 × 10−2 to 1.5 × 10−4 s−1). Mechanical properties such as ultimate tensile strength ( σu), tensile yield strength ( σy), strain to failure ( εf), plastic anisotropy ( r-value), strain rate sensitivity ( m) and strain hardening exponent ( n) were investigated in this study for these strain rates. As the temperature increased from 25 to 300 °C, the following changes in mechanical properties were observed: the yield strength ( σy) decreased by 84.50%, the ultimate tensile strength ( σu) decreased by 87%, the modulus of elasticity ( E) decreased by 63.0%, and the elongation increased by 72.0%. The reduction factors (RF) were proposed for the above-mentioned mechanical properties for varying temperature ranges. The impact of varying temperatures and strain rates on fracture surfaces was investigated using field emission scanning electron microscopy (FE-SEM). The results revealed the presence of tenacity nets, cleavage patterns, and an increasing number of dimples as temperatures increased.

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The Effect of the Forming Mode on Twinning and Springback in the Bending-Dominated Forming of Magnesium AZ31 Sheet

Weiss,

Desinghe,

Hodgson

et al. 2024

Metals

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The sheet metal forming of magnesium is challenging due to the material’s complex springback behaviour, which is due to the tension/compression yield mismatch. In this study, three different AZ31 grain sizes are produced by a special heat treatment, while maintaining the material strength in uniaxial tension at a similar level. Pure, V-die and channel bending tests are combined with roll forming to compare bending scenarios with and without tension applied transverse and parallel to the bending axis. This is complemented with electron backscatter diffraction to measure the twinning type and twinning area fraction (TAF) in the tension and compression bending zones. Our study shows that, like conventional steel, when bending magnesium, springback reduces with the increasing level of the outer fibre bending strain, i.e., when the bend radius is decreased and the TAF increased. It is further shown that when tension is applied, the TAF increases. However, while in some forming cases, the increase in TAF leads to a clear reduction in springback, in other forming cases the effect of the TAF on springback is less pronounced. Overall, this study provides clear evidence that the twinning behaviour in bending magnesium is influenced by the bend deformation mode and that this influences the springback behaviour.

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Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Cited by 3 publications

References 27 publications

Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)

Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)

Varying strain rates and elevated temperatures effects on the mechanical properties of AZ31B magnesium alloy

The Effect of the Forming Mode on Twinning and Springback in the Bending-Dominated Forming of Magnesium AZ31 Sheet

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