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On characterizing the mechanical properties of aluminum-alumina composites

机译：表征铝铝复合材料的力学性能

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The overall response of aluminum-alumina (Al-Al_2O_3) composites depends strongly on their micro-structural characteristics. We study the overall mechanical response of Al-Al_2O_3 composites experimentally, using Resonant Ultrasound Spectroscopy (RUS) and uniaxial compressive testing. Microstructures of composite with 10% alumina volume content are constructed from the microstructural images of the composite obtained from scanning electron microscopy (SEM). The SEM images of the composite are converted to finite element (FE) meshes, which are used to solve the boundary value problem in order to determine the overall mechanical response of the Al-Al_2O_3 composite. The responses generated from the micromechanical models are compared with the elastic modulus obtained from RUS and experimental stress-strain curves from uniaxial compression tests. Effects of processing, porosity, alumina content, thermal (residual) stress, and plastic deformation on the overall elastic modulus and response of the composites are also studied. We observed that slightly altering the processing method had a significant effect on the microstructural characteristics and in turn on the overall physical and mechanical properties of the composite. With changes in porosity by 2-3%, the elastic modulus was found to vary by 10-15 GPa approximately. We observed that the elastic moduli of the composites determined from the uniaxial compressive tests are close to those obtained from RUS.
机译：铝-氧化铝（Al-Al_2O_3）复合材料的整体响应在很大程度上取决于其微结构特征。我们使用共振超声光谱（RUS）和单轴压缩试验，通过实验研究了Al-Al_2O_3复合材料的整体机械响应。由从扫描电子显微镜（SEM）获得的复合材料的微观结构图像来构建氧化铝体积含量为10％的复合材料的微观结构。将复合材料的SEM图像转换为有限元（FE）网格，用于解决边界值问题，从而确定Al-Al_2O_3复合材料的整体机械响应。将微机械模型产生的响应与从RUS获得的弹性模量和单轴压缩试验的实验应力-应变曲线进行比较。还研究了加工，孔隙率，氧化铝含量，热（残余）应力和塑性变形对复合材料总弹性模量和响应的影响。我们观察到，略微改变加工方法会对复合材料的微观结构特征以及整体的物理和机械性能产生重大影响。随着孔隙率变化2-3％，发现弹性模量大约变化10-15GPa。我们观察到，由单轴压缩试验确定的复合材料的弹性模量接近于从RUS获得的弹性模量。

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