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- W4309344138 endingPage "168094" @default.
- W4309344138 startingPage "168094" @default.
- W4309344138 abstract "In this work, the effect of alloying addition on the propensity for twin-twin interactions to transform into crossed-twin structures in magnesium alloys is investigated. A full-field elasto-viscoplastic fast Fourier transform (EVP-FFT) framework combined with a discrete twin model and dislocation density-based hardening law for slip strengths is used to calculate the micromechanical fields in the crystalline matrix around the interacting twins. AZ31 and MgLi alloys are selected along with pure Mg to study the influence of plastic anisotropy in connection with alloying elements. These alloys were selected since their plastic anisotropy measure, which is defined as the ratio between the critical resolved shear stress for pyramidal 〈c+a〉 and basal 〈a〉 slip modes, spanned a wide range. To quantify the role of twin thicknesses, we probe a range of impinging twin thicknesses while fixing the recipient twin thickness. The analysis reveals that: (i) the local driving stress for crossed twin structure formation generated from the interaction of the two twins is lower in a low plastically anisotropic material, like a MgLi alloy, than a high plastically anisotropic material like pure Mg and (ii) the critical impinging twin thickness needed to form the crossed twin structure in pure Mg, AZ31 and MgLi alloys is ~0.5, ~0.75 and ~1.5 times the recipient twin thickness. We propose a relationship between the tendency for crossed twin structure formation and the experimentally observed higher ductility in MgLi alloys compared to pure Mg. One key implication of the findings is that crossed-twin structure formation can be hindered and the ductility of magnesium alloy thereby improved by properly choosing alloying elements that lower the slip strength for pyramidal c+a slip." @default.
- W4309344138 created "2022-11-26" @default.
- W4309344138 creator A5015110468 @default.
- W4309344138 creator A5034851444 @default.
- W4309344138 creator A5090714476 @default.
- W4309344138 date "2023-02-01" @default.
- W4309344138 modified "2023-10-16" @default.
- W4309344138 title "Investigation of crossed-twin structure formation in magnesium and magnesium alloys" @default.
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- W4309344138 doi "https://doi.org/10.1016/j.jallcom.2022.168094" @default.
- W4309344138 hasPublicationYear "2023" @default.
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