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<p>Understanding the temperature dependent deformation behavior of Mg alloys is crucial for their expanding use in the aerospace sector. This study investigates the deformation mechanisms of hot-rolled AZ61 Mg alloy under uniaxial tension along rolling direction (RD) and transverse direction (TD) at −50, 25, 50, and 150°C. Results reveal a transition from high strength with limited elongation at −50°C to significant softening and maximum ductility at 150°C. TD samples consistently showed 2%–6% higher strength than RD; however, this yield anisotropy diminished at 150°C due to the shift from twinning to thermally activated slip and recovery. Fractography indicated a change from semi-brittle to fully ductile fracture with increasing temperature. Electron backscattered diffraction (EBSD) analysis confirmed twinning-driven grain refinement at low temperatures, while deformation at high temperatures involved grain elongation along shear zones, enabling greater strain accommodation before material failure.</p>

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Tensile failure mode transitions from subzero to elevated deformation temperature in Mg–6Al–1Zn alloy

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Hafiz Muhammad Rehan Tariq,
  • Umer Masood Chaudry,
  • Jeong-Rim Lee,
  • Nooruddin Ansari,
  • Mansoor Ali,
  • Tea-Sung Jun

摘要

Understanding the temperature dependent deformation behavior of Mg alloys is crucial for their expanding use in the aerospace sector. This study investigates the deformation mechanisms of hot-rolled AZ61 Mg alloy under uniaxial tension along rolling direction (RD) and transverse direction (TD) at −50, 25, 50, and 150°C. Results reveal a transition from high strength with limited elongation at −50°C to significant softening and maximum ductility at 150°C. TD samples consistently showed 2%–6% higher strength than RD; however, this yield anisotropy diminished at 150°C due to the shift from twinning to thermally activated slip and recovery. Fractography indicated a change from semi-brittle to fully ductile fracture with increasing temperature. Electron backscattered diffraction (EBSD) analysis confirmed twinning-driven grain refinement at low temperatures, while deformation at high temperatures involved grain elongation along shear zones, enabling greater strain accommodation before material failure.