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<p>This investigation presents a systematic analysis of scale-dependent mechanical behaviour in aluminium matrix hybrid composites (AMHCs) through multi-scale indentation techniques. AMHCs were synthesized via powder metallurgy, incorporating dual reinforcements: yttrium tungstate (Y<sub>2</sub>W<sub>3</sub>O<sub>12</sub>) and aluminium nitride (AlN) in two distinct series—Y<sub>2</sub>W<sub>3</sub>O<sub>12</sub>-rich (30 wt.% Y<sub>2</sub>W<sub>2</sub>O<sub>12</sub> with 0-15 wt.% AlN) and AlN-rich (30 wt.% AlN with 0-15 wt.% Y<sub>2</sub>W<sub>3</sub>O<sub>12</sub>). The mechanical response was evaluated using both nano-indentation (0.008N, 0.032N) and micro-indentation (2N, 8N) with a Berkovich indenter. Load-displacement analyses revealed distinct behavioural patterns: heterogeneous responses at the nano-scale versus uniform, iso-symmetric curves at the micro-scale. The indentation size effect (ISE) manifested prominently in nano-indentation, attributed to geometrically necessary dislocations (GNDs). Hardness exhibited an inverse relationship with indentation load, while elastic modulus showed composition-dependent behaviour, with AlN-rich composites demonstrating superior values. Experimental elastic modulus data demonstrated excellent concordance with Halpin-Tsai model predictions, validating the effective load transfer between matrix and reinforcements. This comprehensive characterization establishes crucial correlations between processing parameters, microstructural features, and mechanical properties, providing valuable insights for optimizing AMHCs for advanced engineering applications.</p>

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Multi-scale Mechanical Characterization of Aluminum Matrix Hybrid Composites: Correlating Nano- and Micro-indentation Responses

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Jamuna Sethi,
  • Siddhartha Das,
  • Karabi Das

摘要

This investigation presents a systematic analysis of scale-dependent mechanical behaviour in aluminium matrix hybrid composites (AMHCs) through multi-scale indentation techniques. AMHCs were synthesized via powder metallurgy, incorporating dual reinforcements: yttrium tungstate (Y2W3O12) and aluminium nitride (AlN) in two distinct series—Y2W3O12-rich (30 wt.% Y2W2O12 with 0-15 wt.% AlN) and AlN-rich (30 wt.% AlN with 0-15 wt.% Y2W3O12). The mechanical response was evaluated using both nano-indentation (0.008N, 0.032N) and micro-indentation (2N, 8N) with a Berkovich indenter. Load-displacement analyses revealed distinct behavioural patterns: heterogeneous responses at the nano-scale versus uniform, iso-symmetric curves at the micro-scale. The indentation size effect (ISE) manifested prominently in nano-indentation, attributed to geometrically necessary dislocations (GNDs). Hardness exhibited an inverse relationship with indentation load, while elastic modulus showed composition-dependent behaviour, with AlN-rich composites demonstrating superior values. Experimental elastic modulus data demonstrated excellent concordance with Halpin-Tsai model predictions, validating the effective load transfer between matrix and reinforcements. This comprehensive characterization establishes crucial correlations between processing parameters, microstructural features, and mechanical properties, providing valuable insights for optimizing AMHCs for advanced engineering applications.