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<p>The current study investigates the effect of various microstructural features such as grain refinement, bulk texture, precipitation phenomenon, and phase formation on the mechanical properties and damping behavior of Al–Cu alloy during High-Pressure Torsion (HPT). Grain refinement was drastically reduced from 100 to 6&#xa0;µm, and high-angle boundaries were reduced from 95 to 75%, according to EBSD analysis. This resulted in reduced damping capacity and suppressed grain boundary sliding. The base alloy’s Brass and S textures gave way to the HPT-processed alloy’s Goss and Shear textures, improving crystallographic alignment and lowering internal friction, according to bulk texture analysis. The conversion of coarse precipitates into finely distributed Al<sub>2</sub>Cu and Al<sub>2</sub>CuMg phases, which limit dislocation mobility and further reduce damping behavior, was confirmed by SEM–EDS analysis. In the HPT-processed alloy, XRD analysis revealed peak broadening and increased FWHM, confirming high dislocation density and strain hardening, which limited energy dissipation. HPT significantly enhanced the mechanical properties of the Al–Cu alloy, increasing hardness, strength, and ductility. Due to microstructural rigidity and limited dislocation motion, the HPT-processed alloy showed a lower tan δ in the damping analysis at all frequencies, indicating less vibrational energy absorption. Although HPT processing improves hardness, mechanical strength, and hardness, it reduces damping capacity, so the processed alloy is better suited for load-bearing applications than vibration-sensitive conditions. In order to optimize Al–Cu alloys for use in automotive and aerospace applications, this study clearly links phase evolution, damping behavior, and severe plastic deformation.</p>

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Correlating Grain Refinement, Texture Evolution, Precipitation Behavior and Phase Formation on Mechanical Properties and Damping Behavior of High-Pressure Torsion of Al–Cu Alloy

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • K. Arun Kumar,
  • S. Sarveswara Reddy,
  • Kishore Kumar Kandi,
  • Rama Bhadri Raju Chekuri,
  • Subrahmanyam Sigatapu,
  • M. Anil Kumar,
  • Kumar Raja Gudaru

摘要

The current study investigates the effect of various microstructural features such as grain refinement, bulk texture, precipitation phenomenon, and phase formation on the mechanical properties and damping behavior of Al–Cu alloy during High-Pressure Torsion (HPT). Grain refinement was drastically reduced from 100 to 6 µm, and high-angle boundaries were reduced from 95 to 75%, according to EBSD analysis. This resulted in reduced damping capacity and suppressed grain boundary sliding. The base alloy’s Brass and S textures gave way to the HPT-processed alloy’s Goss and Shear textures, improving crystallographic alignment and lowering internal friction, according to bulk texture analysis. The conversion of coarse precipitates into finely distributed Al2Cu and Al2CuMg phases, which limit dislocation mobility and further reduce damping behavior, was confirmed by SEM–EDS analysis. In the HPT-processed alloy, XRD analysis revealed peak broadening and increased FWHM, confirming high dislocation density and strain hardening, which limited energy dissipation. HPT significantly enhanced the mechanical properties of the Al–Cu alloy, increasing hardness, strength, and ductility. Due to microstructural rigidity and limited dislocation motion, the HPT-processed alloy showed a lower tan δ in the damping analysis at all frequencies, indicating less vibrational energy absorption. Although HPT processing improves hardness, mechanical strength, and hardness, it reduces damping capacity, so the processed alloy is better suited for load-bearing applications than vibration-sensitive conditions. In order to optimize Al–Cu alloys for use in automotive and aerospace applications, this study clearly links phase evolution, damping behavior, and severe plastic deformation.