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<p>Multi-walled carbon nanotubes (MWCNTs), a high-performance nanomaterial with a density ranging from 1.8 to 2.1&#xa0;g/cm<sup>3</sup> (comparable to magnesium alloys), exhibit excellent electrical conductivity and exceptional specific strength. This study prepared MWCNTs-reinforced AZ31 magnesium matrix composites with different mass fractions (0.3-1.2 wt.%) through solid-phase synthesis. The microstructure and mechanical traits of the composites were meticulously examined through scanning electron microscopy (SEM) analysis and tensile strength tests conducted under both low-strain-rate and high-strain-rate scenarios. The experimental results show that with the increase in the mass fraction of MWCNTs, the tensile strength properties of the composites at both high and low strain rate appear to increase and then decrease. When the mass fraction of MWCNTs is 0.6 wt.%, the performance is most significant, and its low-strain-rate and high-strain-rate tensile strengths are enhanced by 24.5% and 22.8%, respectively, compared with those of AZ31 magnesium alloy. This research provides theoretical foundations and experimental references for developing high-performance magnesium matrix composites.</p>

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Mechanical Properties of MWCNTs/Mg Composites at High Strain Rates

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Qing Shuai Gao,
  • You Bin Wang,
  • Bo Shi Jiang,
  • Kai Han Zhou,
  • Ning Wang,
  • Xian Long Wu,
  • Zhe Wu

摘要

Multi-walled carbon nanotubes (MWCNTs), a high-performance nanomaterial with a density ranging from 1.8 to 2.1 g/cm3 (comparable to magnesium alloys), exhibit excellent electrical conductivity and exceptional specific strength. This study prepared MWCNTs-reinforced AZ31 magnesium matrix composites with different mass fractions (0.3-1.2 wt.%) through solid-phase synthesis. The microstructure and mechanical traits of the composites were meticulously examined through scanning electron microscopy (SEM) analysis and tensile strength tests conducted under both low-strain-rate and high-strain-rate scenarios. The experimental results show that with the increase in the mass fraction of MWCNTs, the tensile strength properties of the composites at both high and low strain rate appear to increase and then decrease. When the mass fraction of MWCNTs is 0.6 wt.%, the performance is most significant, and its low-strain-rate and high-strain-rate tensile strengths are enhanced by 24.5% and 22.8%, respectively, compared with those of AZ31 magnesium alloy. This research provides theoretical foundations and experimental references for developing high-performance magnesium matrix composites.