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<p>High-strength aluminum (Al)-based composites with exceptional ductility require robust strain-hardening capabilities. In this study, an in situ multiscale Al<sub>3</sub>BC phase-reinforced composite ( &gt; 60%&#xa0;wt.% Al<sub>3</sub>BC) was successfully fabricated by solid-state processing. The fabrication route involved 7&#xa0;h of mechanical milling, sintering at 1000&#xa0;°C for 1&#xa0;h, and subsequent hot pressing at 400&#xa0;°C and 40&#xa0;MPa. The resulting material achieved an excellent balance of strength (284&#xa0;MPa) and plastic strain (17%). Microstructure analysis revealed a homogeneous matrix with multiscale, micrometer-sized in situ Al<sub>3</sub>BC reinforcements distributed throughout the Al matrix. Investigation of the strain rate sensitivity (<i>m </i>= 0.032) and low activation volume (<i>V</i><sup>* </sup>= 8<i>b</i><sup>3</sup>) confirms the thermally activated dislocation storage (<i>ρ</i><sub><i>f </i></sub>= 1.8 × 10<sup>16</sup>m<sup>−2</sup>) drives this synergy. Taylor hardening was identified as the primary deformation mechanism, where the plastic flow dislocation density scales with the strain rate (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\dot{\varepsilon }\)</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mi>ε</mi> <mo>˙</mo> </mover> </math></EquationSource> </InlineEquation>), demonstrating that dislocation storage increasingly outweighs annihilation at higher deformation rates.</p>

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Strain-Rate-Dependent Micro-Mechanical Behavior of Multiscale In Situ Al3BC Phase-Reinforced Al3BC/Al Composite Manufactured via Solid-State Processing

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Tapabrata Maity,
  • Debdas Roy

摘要

High-strength aluminum (Al)-based composites with exceptional ductility require robust strain-hardening capabilities. In this study, an in situ multiscale Al3BC phase-reinforced composite ( > 60% wt.% Al3BC) was successfully fabricated by solid-state processing. The fabrication route involved 7 h of mechanical milling, sintering at 1000 °C for 1 h, and subsequent hot pressing at 400 °C and 40 MPa. The resulting material achieved an excellent balance of strength (284 MPa) and plastic strain (17%). Microstructure analysis revealed a homogeneous matrix with multiscale, micrometer-sized in situ Al3BC reinforcements distributed throughout the Al matrix. Investigation of the strain rate sensitivity (m = 0.032) and low activation volume (V* = 8b3) confirms the thermally activated dislocation storage (ρf = 1.8 × 1016m−2) drives this synergy. Taylor hardening was identified as the primary deformation mechanism, where the plastic flow dislocation density scales with the strain rate ( \(\dot{\varepsilon }\) ε ˙ ), demonstrating that dislocation storage increasingly outweighs annihilation at higher deformation rates.