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Exploring the transfer of plasticity across Laves phase interfaces in a dual phase magnesium alloy

Abstract : The mechanical behaviour of Mg-Al alloys can be largely improved by the formation of an intermetallic Laves phase skeleton, in particular the creep strength. Recent nanomechanical studies revealed plasticity by dislocation glide in the (Mg,Al)2Ca Laves phase, even at room temperature. As strengthening skeleton, this phase remains, however, brittle at low temperature. In this work, we present experimental evidence of slip transfer from the Mg matrix to the (Mg,Al)2Ca skeleton at room temperature and explore associated mechanisms by means of atomistic simulations. We identify two possible mechanisms for transferring Mg basal slip into Laves phases depending on the crystallographic orientation: a direct and an indirect slip transfer triggered by full and partial dislocations, respectively. Our experimental and numerical observations also highlight the importance of interfacial sliding that can prevent the transfer of the plasticity from one phase to the other.
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Contributor : Julien Guénolé Connect in order to contact the contributor
Submitted on : Friday, February 19, 2021 - 9:37:20 AM
Last modification on : Tuesday, October 19, 2021 - 11:46:33 AM
Long-term archiving on: : Thursday, May 20, 2021 - 6:20:15 PM


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Julien Guénolé, Muhammad Zubair, Swagata Roy, Zhuocheng Xie, Marta Lipińska-Chwałek, et al.. Exploring the transfer of plasticity across Laves phase interfaces in a dual phase magnesium alloy. Materials and Design, Elsevier, 2021, 202, pp.109572. ⟨10.1016/j.matdes.2021.109572⟩. ⟨hal-03146421⟩



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