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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.

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Title: Strain-Rate-Dependent Micro-Mechanical Behavior of Multiscale In Situ Al3BC Phase-Reinforced Al3BC/Al Composite Manufactured via Solid-State Processing.
Authors: Maity, Tapabrata1 (AUTHOR) maitytapabrata@gmail.com, Roy, Debdas1 (AUTHOR) droy2k6@gmail.com
Source: Journal of Materials Engineering & Performance. Sep2026, Vol. 35 Issue 34, p36033-36039. 7p.
Subjects: Strain rate, Dislocation density, Aluminum composites, Hot pressing, Mechanical alloying, Powder metallurgy, Micromechanics
Abstract: 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 ( ε ˙ ), demonstrating that dislocation storage increasingly outweighs annihilation at higher deformation rates. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract: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 ( ε ˙ ), demonstrating that dislocation storage increasingly outweighs annihilation at higher deformation rates. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-026-14250-x