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首页> 外文期刊>Composites Science and Technology >Measurement of the evolution of internal strain and load partitioning in magnesium hybrid composites under compression load using in-situ synchrotron X-ray diffraction analysis
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Measurement of the evolution of internal strain and load partitioning in magnesium hybrid composites under compression load using in-situ synchrotron X-ray diffraction analysis

机译:利用原位同步加速器X射线衍射分析测量压缩载荷下镁杂化复合材料内部应变和载荷分配的演变

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Energy dispersive synchrotron X-ray diffraction analysis has been applied to evaluate the evolution of average internal elastic lattice strains under compression load within the phases of magnesium hybrid composites, reinforced by silicon-carbide particles and Saffil~® alumina short fibres. This allows for the calculation of phase stresses and thus the load partitioning. The mean elastic misfit stresses were calculated using an Eshelby type modelling. Considering the external load, prediction of the phase-specific stresses for elastic composite deformation was performed and the results were compared to the experimental data obtained. Matrix elastic lattice strains reveal high plastic anisotropy due to the activation of different deformation modes in the form of crystallographic slip and mechanical twinning. The formation of twins, verified by diffraction intensity shifts due to crystallographic reorientation, was found to affect the sharing of load between the participating phases. Consequently different regimes of composite deformation were specified. This comprises elastic regions characterized by linear strain and stress growth for all phases as well as plastic regions showing nonlinear distributions.
机译:能量色散同步加速器X射线衍射分析已用于评估在碳化硅颗粒和Saffil〜®氧化铝短纤维增强的镁杂化复合材料相中压缩载荷下平均内部弹性晶格应变的演变。这允许计算相应力,从而进行负载分配。使用Eshelby型模型计算平均弹性失配应力。考虑到外部载荷,对弹性复合材料变形的相比应力进行了预测,并将结果与​​获得的实验数据进行了比较。基质弹性晶格应变显示出高塑性各向异性,这是由于以晶体滑移和机械孪生的形式激活了不同的变形模式。发现双晶的形成,由于晶体学重新取向而引起的衍射强度变化证实,会影响参与相之间的载荷分配。因此,规定了不同的复合变形方案。它包括以所有阶段的线性应变和应力增长为特征的弹性区域,以及表现出非线性分布的塑性区域。

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