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HomeAdvanced Engineering ForumAdvanced Engineering Forum Vol. 35Modelling of the Strain Hardening Behaviour of...

Modelling of the Strain Hardening Behaviour of Die-Cast Magnesium-Aluminium-Rare Earth Alloy

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Abstract:

The tensile deformation behaviour of magnesium alloy AE44 (Mg-4Al-4RE) under strain rates ranging from 10^-6 to 10^-1 s^-1 has been investigated. Present study shows that the deformation mode begins with the activation of elastic (Stage 1), followed by <a> basal slip and twinning (Stage 2), <a> prismatic slip (Stage 3) and finally to <c+a> pyramidal slip (Stage 4). The commencement of these deformation mechanisms results in four distinct stages of strain hardening in the stress-strain curve. In this work, the four stages of deformation behaviour are modelled, and an empirical equation is proposed to predict the entire stress-strain curve. Overall, the model predictions are in good agreement with the experimental data. This study on the decomposition of stress-strain curve into four stages provides insights into the contribution of individual deformation mechanism to the overall deformation behaviour and opens a new way to assess mechanical properties of die-cast magnesium alloys.

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Advanced Engineering Forum Vol.35

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Advanced Engineering Forum (Volume 35)

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1-8

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https://doi.org/10.4028/www.scientific.net/AEF.35.1

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February 2020

Authors:

Hua Qian Ang*

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Magnesium Alloys, Modelling, Slip, Strain Hardening, Twinning

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