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基于自由体积理论和Ramberg-Osgood模型,并利用ABAQUS软件,建立颗粒随机分布代表性体积单元模型,模拟了Ti_(64.5)Zr_(14.5)V_(18.5)Cu_(2.5)颗粒增韧Ti基金属玻璃基复合材料在单轴拉伸状态下的微结构效应,讨论了颗粒的体积分数、团聚数目、长径比、定位取向和界面对金属玻璃韧性的影响。结果表明:提高颗粒体积分数能显著提高复合材料的塑性,但部分牺牲了复合材料的强度;增大颗粒长径比能够增强复合材料的塑性和屈服强度;使颗粒的取向与荷载方向成90°或0°,不仅增强了复合材料的塑性,而且与其他排布相比也增强了复合材料的强度;减少团聚数目至2个以下,能明显减少金属玻璃基复合材料的塑性和强度的损失,使团聚中颗粒与荷载成90°,却能改善复合材料的塑性和强度;在颗粒增韧金属玻璃基复合材料中加入零厚度界面,能观察到在主剪切带上颗粒和基体在界面处脱粘,得到与实验现象更加吻合的结果。通过上述的研究能够很好地理解复合材料的微结构效应,并有利于材料的设计。
Based on the free volume theory and the Ramberg-Osgood model, and using the ABAQUS software, a representative particle model of random distribution of particles was established, and the Ti-based metallic glass with Ti 64.5 Zr 14.5 V 18.5 Cu 2.5 particles toughened The microstructural effects of the matrix composites under uniaxial tension were investigated. The effects of the volume fraction of particles, the number of agglomerates, the aspect ratio, orientation orientation and interface on the toughness of the metallic glass were discussed. The results show that increasing the volume fraction of particles can significantly improve the plasticity of the composites, but at the expense of the strength of the composites. Increasing the aspect ratio can enhance the plasticity and yield strength of the composites. The particle orientation is 90 ° Or 0 °, not only enhance the plasticity of the composite, but also enhance the strength of the composite compared with other arrangements; reducing the number of agglomerations to less than 2 can obviously reduce the plasticity and the strength loss of the metal-glass matrix composite, So that the agglomeration of particles and load at 90 °, but can improve the plasticity and strength of the composite; particle toughened metallic glass-based composite materials by adding zero thickness interface, can be observed in the main shear zone particles and the matrix at the interface Debonding, get more consistent with the experimental results of the results. Through the above study, the microstructure effect of the composite material can be well understood and the material design is facilitated.