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Manipulating deformation mechanisms with Y alloying of Mg

机译：用镁合金化操纵变形机制

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The effect of Y concentration on the slip and twinning mechanisms in binary Mg-Y alloys are investigated using transmission electron microscopy, electron backscattered diffraction, and visco-plastic self-consistent polycrystal constitutive modeling. Four concentrations of Y are studied in hot-rolled and recrystallized sheet material. The materials were deformed in tension and compression in the rolling direction and compression in the normal direction in order to invoke distinct proportions of slip and twin mechanisms with each test. Within the single crystal hardening model used in polycrystal modeling, a slip-twin interaction law is introduced to account for dislocation density reductions due to dislocation absorption during twin boundary migration. We show that increasing Y concentration reduces the intensities of both the initial and deformation textures. During deformation, the plastic anisotropy in yield stress, the tension-compression asymmetry, and amount of {1012} (1011) twinning is shown to decrease with increasing Y. For each alloy, the model identifies a single set of material parameters that successfully reproduced all measured stress-strain curves and achieved agreement with measured deformation textures and twin area fractions. Transcending texture effects, the model interpretation of the flow responses suggests that increased concentrations of Y increase the critical resolved shear stress for basal slip but have negligible effects on the other slip modes. The reduced plastic anisotropy with increases in Y is explained by a concomitant decrease in the prismatic-to-pyramidal slip critical resolved shear stress ratio. The model suggests that their nearly equivalent critical resolved shear stress values lead to the enhanced non-basal activity of Mg-Y alloys, which was confirmed by transmission electron microscopy. The calculations suggest that beyond any texture differences, this reduction in twinning can be attributed to a slightly increased resistance for {1012} (1011) twin propagation, particularly in the binary with the highest Y content.
机译：使用透射电子显微镜，电子背散射衍射和粘塑性自给自晶组成型建模研究了Y浓度对二元Mg-Y合金中的滑移和孪晶机制的影响。在热轧和重结晶的板材中研究了四种浓度的Y.这些材料在张力和滚动方向上的压缩中变形并在正常方向上压缩，以便在每个测试中调用不同比例的滑动和双躯机构。在多晶建模中使用的单晶硬化模型内，引入了滑动双相互作用规律，以考虑在双边界迁移期间由于位错吸收引起的位错密度降低。我们表明，y浓度的增加会降低初始和变形纹理的强度。在变形期间，屈服应力，张力 - 压缩不对称性和{1012}（1012}（1011）孪晶的量的塑性各向异性显示为随着Y的增加而降低。对于每个合金，模型识别成功转载的单一材料参数所有测量的应力 - 应变曲线和达到测量变形纹理和双面积分数的一致性。超越纹理效果，流量响应的模型解释表明，增加的Y浓度提高了基础滑动的临界分辨剪切应力，但对其他滑动模式具有可忽略的影响。通过伴随棱柱形对金字塔狭窄临界分辨剪切应力比的伴随的降低，解释了随着y增加的降低的塑性各向异性。该模型表明，其几乎等同的临界分辨剪切应力值导致Mg-Y合金的增强的非基础活性，其通过透射电子显微镜确认。该计算表明，除了任何纹理差异之外，Twinning的这种减少可归因于{1012}（1011）双传播的电阻略微增加，特别是在具有最高y内容的二进制中。

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