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首页> 外文会议>Symposium on magnesium technology;TMS annual meeting exhibition >Limitation of current hardening models in predicting anisotropy by twinning in hcp metals: Application to a rod-textured AM30 magnesium alloy
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Limitation of current hardening models in predicting anisotropy by twinning in hcp metals: Application to a rod-textured AM30 magnesium alloy

机译：当前的硬化模型在通过六方晶系金属孪晶预测各向异性中的局限性：在棒状AM30镁合金中的应用

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When a strongly textured hexagonal close packed (HGP) metal is loaded under an orientation causing profuse twinning or detwinning, the stress-strain curve is sigmoidal in shape and inflects at some threshold. Authors have largely attributed the dramatic stress increase in the lower-bound vicinity of the inflection point to a combined effect of a Hall-Petch mechanism correlated to grain refinement by twinning, and twinning-induced reorientation requiring activation of hard slip modes. We experimentally and numerically demonstrate that these two mechanisms alone are unable to reproduce the stress-strain behaviors obtained under intermediate loading orientations correlated to in-between profuse twinning and nominal twinning. We argue based on adopting various mechanistic approaches in hardening model correlations from the literature. We used both a physics dislocation based model and a phenomenological Voce hardening model. The HOP material is exemplified by an extruded AM30 magnesium alloy with a (1010)-fiber parallel to the extrusion direction.
机译：当将强烈纹理的六方密堆积（HGP）金属加载到导致大量孪生或解缠的方向下时，应力-应变曲线的形状呈S型，并在某个阈值处弯曲。作者在很大程度上将拐点下限附近应力的急剧增加归因于霍尔-Petch机理的综合作用，该机制与孪晶细化相关，而孪晶诱导的重新取向需要激活硬滑模。我们通过实验和数值证明，仅这两种机制都无法重现在与中间孪生和名义孪生之间相关的中间载荷定向下获得的应力应变行为。我们认为基于采用各种机制方法来强化文献中的模型相关性。我们使用了基于物理位错的模型和现象学的Voce强化模型。 HOP材料的示例是具有（1010）纤维平行于挤压方向的AM30挤压镁合金。

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