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<p>Graphene is considered promising reinforcement for improving the mechanical properties of the titanium alloys. However, overcoming the strength–ductility trade-off in graphene-reinforced titanium composites remains a challenge. In this study, the high-performance graphene nanoplatelets (GNPs) reinforced Ti–6Al–4V (TC4) matrix composites were successfully synthesized by combining the hot-pressing sintering and hot-rolling methods. Studies on the effect of GNPs on microstructures and properties of the as-sintered and as-rolled TC4 composites were systematically conducted. It indicates that the strength of the composites can be substantially enhanced by the addition of GNPs, primarily attributable to grain refinement and the pinning effect induced by in situ formed TiC particles. Moreover, the increase in the GNPs content results in a decrease in the plasticity of the as-sintered composites due to the aggregation of TiC. Additionally, hot rolling synchronously enhances the strength and plasticity of the composites by facilitating the homogeneous dispersion of TiC within the TC4 matrix. This work provided a potential strategy in designing the graphene-reinforced TC4 matrix composites with superior strength–ductility synergy.</p>

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Microstructural Evolution and Mechanical Properties of Graphene Nanoplatelet Reinforced Ti–6Al–4V Matrix Composites

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Xinrui Gu,
  • Xudong Yuan,
  • Tingyi Yan,
  • Biao Li,
  • Haojie Liang,
  • Jingyu Pang,
  • Huameng Fu,
  • Hongwei Zhang,
  • Long Zhang

摘要

Graphene is considered promising reinforcement for improving the mechanical properties of the titanium alloys. However, overcoming the strength–ductility trade-off in graphene-reinforced titanium composites remains a challenge. In this study, the high-performance graphene nanoplatelets (GNPs) reinforced Ti–6Al–4V (TC4) matrix composites were successfully synthesized by combining the hot-pressing sintering and hot-rolling methods. Studies on the effect of GNPs on microstructures and properties of the as-sintered and as-rolled TC4 composites were systematically conducted. It indicates that the strength of the composites can be substantially enhanced by the addition of GNPs, primarily attributable to grain refinement and the pinning effect induced by in situ formed TiC particles. Moreover, the increase in the GNPs content results in a decrease in the plasticity of the as-sintered composites due to the aggregation of TiC. Additionally, hot rolling synchronously enhances the strength and plasticity of the composites by facilitating the homogeneous dispersion of TiC within the TC4 matrix. This work provided a potential strategy in designing the graphene-reinforced TC4 matrix composites with superior strength–ductility synergy.