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<p>This study fabricated (ZrB<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>)<sub>np</sub>/AA6016 aluminum matrix composites through tri-field synergistic regulation (ultrasonic field: 20 kHz cavitation effect; electromagnetic field: 10 Hz melt convection; static pressure: 50 MPa densification) to investigate the effects of external fields on material microstructure and tensile properties. Results demonstrate that tri-field coupling significantly refines α-Al grains, reducing the grain size from 73.6&#xa0;µm (in the field-free condition) to 47.8&#xa0;µm (a 35.1% reduction). Simultaneous ultrasonic dendrite fragmentation, electromagnetic particle dispersion, and pressure-induced pore suppression achieved a uniform distribution of reinforcement phases (ZrB<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>) with clean interfacial bonding. The ZrB<sub>2</sub> nanoparticles exhibit a hexagonal distribution with an average size of approximately 89.4 nm; the Al<sub>2</sub>O<sub>3</sub> nanoparticles appear nearly spherical with an average size of about 48.5 nm.&#xa0;Room-temperature tensile properties exhibited marked improvements: yield strength (YS), ultimate tensile strength (UTS), and elongation reached 89.2 MPa, 172.3 MPa, and 19.6% under ultrasonic-magnetic/pressure fields, representing 17.1%, 6.3%, and 8.3% enhancements compared to ultrasonic-magnetic regulation alone. Elevated-temperature performance (250 °C) showed UTS, YS, and elongation of 185.6 MPa, 172.2 MPa, and 27.1%, with 8.6%, 8.9%, and 29.7% increases over field-free conditions, respectively. These improvements are attributed to nanoparticle-induced grain boundary pinning and the suppression of dynamic recrystallization. Mechanistic analysis reveals that synergistic strengthening mechanisms—grain refinement (Hall–Petch effect), Orowan strengthening (dislocation loop formation), load transfer, and CTE mismatch strengthening—collectively optimize the strength-ductility balance.</p>

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Effect of Ultrasonic-Magnetic coupling fields and Pressure field on the Microstructure and Tensile Properties of in situ nano-(ZrB2+Al2O3)/6016Al composites

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Lei Jiao,
  • Fu Liu,
  • Tao Li,
  • Mingyu Wang,
  • Xinlei Wang,
  • Yutao Zhao,
  • Shcheretskyi Volodymyr

摘要

This study fabricated (ZrB2+Al2O3)np/AA6016 aluminum matrix composites through tri-field synergistic regulation (ultrasonic field: 20 kHz cavitation effect; electromagnetic field: 10 Hz melt convection; static pressure: 50 MPa densification) to investigate the effects of external fields on material microstructure and tensile properties. Results demonstrate that tri-field coupling significantly refines α-Al grains, reducing the grain size from 73.6 µm (in the field-free condition) to 47.8 µm (a 35.1% reduction). Simultaneous ultrasonic dendrite fragmentation, electromagnetic particle dispersion, and pressure-induced pore suppression achieved a uniform distribution of reinforcement phases (ZrB2 and Al2O3) with clean interfacial bonding. The ZrB2 nanoparticles exhibit a hexagonal distribution with an average size of approximately 89.4 nm; the Al2O3 nanoparticles appear nearly spherical with an average size of about 48.5 nm. Room-temperature tensile properties exhibited marked improvements: yield strength (YS), ultimate tensile strength (UTS), and elongation reached 89.2 MPa, 172.3 MPa, and 19.6% under ultrasonic-magnetic/pressure fields, representing 17.1%, 6.3%, and 8.3% enhancements compared to ultrasonic-magnetic regulation alone. Elevated-temperature performance (250 °C) showed UTS, YS, and elongation of 185.6 MPa, 172.2 MPa, and 27.1%, with 8.6%, 8.9%, and 29.7% increases over field-free conditions, respectively. These improvements are attributed to nanoparticle-induced grain boundary pinning and the suppression of dynamic recrystallization. Mechanistic analysis reveals that synergistic strengthening mechanisms—grain refinement (Hall–Petch effect), Orowan strengthening (dislocation loop formation), load transfer, and CTE mismatch strengthening—collectively optimize the strength-ductility balance.