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<p>A micromechanics-based investigation was conducted to elucidate the effect of the hierarchical microstructure of mortar-and-brick on the tensile behavior of bulk metallic glass matrix composites (BMGCs). The strengthening and toughening mechanisms of BMGCs were elucidated in terms of the quantitative structure-activity correlations predicted. A mesoscopic constitutive model was developed to analyze the dependence of the equivalent modulus, yield stress, and yield strain on microstructure parameters of BMGCs. The concept of free volume was employed to depict the nucleation, growth, and coalescence of shear bands in the BMG matrix, in accordance with the principles of free volume theory. This theory has been incorporated into the ABAQUS code as a user-defined material subroutine, UMAT. The Cowper-Symonds equations were employed to delineate the strain-rate dependent elastoplastic behaviors of the ductile phase. The impedance efficiency of a range of parameters on the propagation of shear bands was investigated, leading to the identification of the micro-deformation mechanism as a means of enhancing BMG’s tensile plasticity, whereby the designing scope over the mortar- and-brick morphology could be well constructed. This work is beneficial in elucidating the failure mechanisms and toughening design of nacre-mimetic BMGCs.</p>

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Computational Micromechanics of Bulk Metallic Glass Matrix Composites with Mortar-and-Brick Architectures

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Yunpeng Jiang,
  • Yukai Wang

摘要

A micromechanics-based investigation was conducted to elucidate the effect of the hierarchical microstructure of mortar-and-brick on the tensile behavior of bulk metallic glass matrix composites (BMGCs). The strengthening and toughening mechanisms of BMGCs were elucidated in terms of the quantitative structure-activity correlations predicted. A mesoscopic constitutive model was developed to analyze the dependence of the equivalent modulus, yield stress, and yield strain on microstructure parameters of BMGCs. The concept of free volume was employed to depict the nucleation, growth, and coalescence of shear bands in the BMG matrix, in accordance with the principles of free volume theory. This theory has been incorporated into the ABAQUS code as a user-defined material subroutine, UMAT. The Cowper-Symonds equations were employed to delineate the strain-rate dependent elastoplastic behaviors of the ductile phase. The impedance efficiency of a range of parameters on the propagation of shear bands was investigated, leading to the identification of the micro-deformation mechanism as a means of enhancing BMG’s tensile plasticity, whereby the designing scope over the mortar- and-brick morphology could be well constructed. This work is beneficial in elucidating the failure mechanisms and toughening design of nacre-mimetic BMGCs.