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<p>In order to examine the influence of graphene nanoplatelet (GNP) incorporation on the microstructure and tensile characteristics of AZ31 magnesium alloys, a dispersion processing method was employed to prepare magnesium matrix composites (GNPs/AZ31) with varying mass fractions of GNPs, specifically 0.1&#xa0;wt.%, 0.3&#xa0;wt.%, and 0.6&#xa0;wt.%. Uniaxial tensile loading tests were conducted to evaluate and compare the effects of different GNP concentrations on the GNPs/AZ31 properties, focusing on tensile strength, yield strength, elongation, and fracture work. Additionally, microstructural characterization techniques, including optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, were utilized to investigate the microstructural evolution of the GNPs/AZ31 in terms of grain size, composition, phase distribution, dislocation density, and texture. The results from the uniaxial tensile tests indicated a synergistic enhancement in both strength and toughness of the GNPs/AZ31 with increasing GNP content. Notably, at a GNP concentration of 0.6&#xa0;wt.%, the GNPs/AZ31 exhibited tensile strength, yield strength, elongation, and fracture work values of 360&#xa0;MPa, 253&#xa0;MPa, 23.7%, and 72&#xa0;J&#xa0;m<sup>−3</sup>, respectively. Microstructural analysis indicates that the GNPs are evenly dispersed throughout the GNPs/AZ31. As the quantity of GNPs increases, there is a corresponding reduction in the grain size; concurrently, there is an increase in dislocation density. This phenomenon is advantageous for enhancing the strength of the GNPs/AZ31. Furthermore, the texture intensity of the (0002) basal plane exhibits a slight reduction in the GNPs/AZ31, which promotes the activation of multiple crystal slip systems and enhances the plasticity of the material. This study may provide significant experimental data which could facilitate the advancement of high-performance GNPs/AZ31 and enhance the utilization of AZ31 magnesium alloy in aerospace, automotive, and consumer electronics applications.</p>

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Microscopic Analysis of the Synergistic Mechanism of Strength and Toughness of Magnesium Alloys Reinforced by Graphene Nanoplatelets

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Zhenhu Hua,
  • Yongting Lan

摘要

In order to examine the influence of graphene nanoplatelet (GNP) incorporation on the microstructure and tensile characteristics of AZ31 magnesium alloys, a dispersion processing method was employed to prepare magnesium matrix composites (GNPs/AZ31) with varying mass fractions of GNPs, specifically 0.1 wt.%, 0.3 wt.%, and 0.6 wt.%. Uniaxial tensile loading tests were conducted to evaluate and compare the effects of different GNP concentrations on the GNPs/AZ31 properties, focusing on tensile strength, yield strength, elongation, and fracture work. Additionally, microstructural characterization techniques, including optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, were utilized to investigate the microstructural evolution of the GNPs/AZ31 in terms of grain size, composition, phase distribution, dislocation density, and texture. The results from the uniaxial tensile tests indicated a synergistic enhancement in both strength and toughness of the GNPs/AZ31 with increasing GNP content. Notably, at a GNP concentration of 0.6 wt.%, the GNPs/AZ31 exhibited tensile strength, yield strength, elongation, and fracture work values of 360 MPa, 253 MPa, 23.7%, and 72 J m−3, respectively. Microstructural analysis indicates that the GNPs are evenly dispersed throughout the GNPs/AZ31. As the quantity of GNPs increases, there is a corresponding reduction in the grain size; concurrently, there is an increase in dislocation density. This phenomenon is advantageous for enhancing the strength of the GNPs/AZ31. Furthermore, the texture intensity of the (0002) basal plane exhibits a slight reduction in the GNPs/AZ31, which promotes the activation of multiple crystal slip systems and enhances the plasticity of the material. This study may provide significant experimental data which could facilitate the advancement of high-performance GNPs/AZ31 and enhance the utilization of AZ31 magnesium alloy in aerospace, automotive, and consumer electronics applications.