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<p>In this study, the microstructure evolution and deformation behavior of heat-treated AZ91D composites reinforced with AlCrFeCoNi particles were systematically examined under dynamic compression. Dynamic compression tests were performed at various temperatures and strain rates (1000–2800&#xa0;s<sup>−1</sup>) using a split Hopkinson pressure bar. The samples’ microstructure and deformation behavior were analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. The results demonstrated that the AlCrFeCoNi particles considerably improved the peak stress and strain of the heat-treated samples across the tested strain rates and led to an increased number of deformation bands in the microstructure. Post-compression analysis revealed that the AlCrFeCoNi particles in the heat-treated samples experienced fracturing yet maintained strong bonding with the α-Mg matrix. Analysis of temperature-dependent deformation mechanisms showed that at 25°&#xa0;C, the main deformation modes were basal slip and pyramidal slip, while at 250°&#xa0;C, non-basal slip became the predominant mechanism.</p>

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Study on the Dynamic Compression Behavior of Heat-Treated AlCrFeCoNip/AZ91D Composites

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Yongsheng Chen,
  • Xiaochen Zhang,
  • Jiajie Wang,
  • Wangbo Xu

摘要

In this study, the microstructure evolution and deformation behavior of heat-treated AZ91D composites reinforced with AlCrFeCoNi particles were systematically examined under dynamic compression. Dynamic compression tests were performed at various temperatures and strain rates (1000–2800 s−1) using a split Hopkinson pressure bar. The samples’ microstructure and deformation behavior were analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. The results demonstrated that the AlCrFeCoNi particles considerably improved the peak stress and strain of the heat-treated samples across the tested strain rates and led to an increased number of deformation bands in the microstructure. Post-compression analysis revealed that the AlCrFeCoNi particles in the heat-treated samples experienced fracturing yet maintained strong bonding with the α-Mg matrix. Analysis of temperature-dependent deformation mechanisms showed that at 25° C, the main deformation modes were basal slip and pyramidal slip, while at 250° C, non-basal slip became the predominant mechanism.