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<p>The load-dependent nanomechanical behavior of Al6061 matrix composites reinforced with Al<sub>2</sub>O<sub>3</sub> and SiC ceramic fillers was investigated using nanoindentation and nano-dynamic mechanical analysis (nano-DMA). Fourier-transform infrared spectroscopy (FTIR) identified characteristic bonding-related peaks associated with oxide and reinforcement interactions within the composite system. Thermogravimetric analysis (TGA) indicated comparatively improved thermal stability for the 311-SiC composite, while the 310-Al<sub>2</sub>O<sub>3</sub> and 312-Hybrid samples exhibited thermal shoulder regions near 305&#xa0;°C, suggesting interfacial thermal activation phenomena associated with the reinforcement phases. Nano-DMA performed at peak loads of 7 and 10&#xa0;mN demonstrated clear load-dependent viscoelastic behavior, with both storage modulus (<i>E</i>′) and loss modulus (<i>E</i>″) increasing with indentation load. Among the investigated composites, sample 311-SiC exhibited the highest hardness (17.7&#xa0;GPa) and storage modulus (232.15&#xa0;GPa), indicating superior stiffness and elastic load-bearing capability. In contrast, the 312-Hybrid composite showed the highest tan<i>δ</i> and loss modulus, indicating enhanced energy dissipation and damping behavior. Maxwell model analysis showed that all composites operated predominantly in the elastic-dominant viscoelastic regime (<i>ωτ</i> &gt; 1) at the testing frequency. Microstructural observations revealed notable variations in grain morphology and reinforcement distribution among the composites, ranging from elongated grain structures in the SiC-reinforced sample to comparatively heterogeneous layered morphologies in the hybrid system. The results demonstrate that reinforcement type and hybridization significantly influence the thermal stability, stiffness, and damping response of Al6061 composites, highlighting their potential for lightweight structural and vibration-sensitive engineering applications.</p>

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Load-Dependent Dynamic Mechanical Analysis through Nanoindentation and Validation Using Maxwell Model of Al6061 Reinforced with Al2O3, SiC Fillers

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • A. R. Harikrishnan,
  • S. Premjith,
  • Rajeev K. Mohan,
  • Johan George Cherian,
  • Nijo Jose,
  • Sathyamoorthy Margabandhu,
  • Abin Roy,
  • Abin Paul,
  • Noble George,
  • Manuel George

摘要

The load-dependent nanomechanical behavior of Al6061 matrix composites reinforced with Al2O3 and SiC ceramic fillers was investigated using nanoindentation and nano-dynamic mechanical analysis (nano-DMA). Fourier-transform infrared spectroscopy (FTIR) identified characteristic bonding-related peaks associated with oxide and reinforcement interactions within the composite system. Thermogravimetric analysis (TGA) indicated comparatively improved thermal stability for the 311-SiC composite, while the 310-Al2O3 and 312-Hybrid samples exhibited thermal shoulder regions near 305 °C, suggesting interfacial thermal activation phenomena associated with the reinforcement phases. Nano-DMA performed at peak loads of 7 and 10 mN demonstrated clear load-dependent viscoelastic behavior, with both storage modulus (E′) and loss modulus (E″) increasing with indentation load. Among the investigated composites, sample 311-SiC exhibited the highest hardness (17.7 GPa) and storage modulus (232.15 GPa), indicating superior stiffness and elastic load-bearing capability. In contrast, the 312-Hybrid composite showed the highest tanδ and loss modulus, indicating enhanced energy dissipation and damping behavior. Maxwell model analysis showed that all composites operated predominantly in the elastic-dominant viscoelastic regime (ωτ > 1) at the testing frequency. Microstructural observations revealed notable variations in grain morphology and reinforcement distribution among the composites, ranging from elongated grain structures in the SiC-reinforced sample to comparatively heterogeneous layered morphologies in the hybrid system. The results demonstrate that reinforcement type and hybridization significantly influence the thermal stability, stiffness, and damping response of Al6061 composites, highlighting their potential for lightweight structural and vibration-sensitive engineering applications.