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Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system

Journal Article


Abstract


  • The mechanical properties and structural stability of a high-pressure torsion (HPT)-induced bulk nanostructured metastable Al–Mg system were examined after natural aging at room temperature for 60 days. The sample demonstrated a high yield strength of 1.3–1.5 GPa with an excellent plasticity by achieving a high strain rate sensitivity of 0.036. The high hardness is attributed to the concurrent contributions of grain refinement and solid solution strengthening. An X-ray diffraction analysis revealed a high compositional microstrain of ~0.0202 due to the supersaturation of Mg in the Al matrix after processing. This microstrain increased to ~0.0274 after natural aging due to the heterogeneous distribution of supersaturated Mg solutes without any nucleation of a second phase, thereby demonstrating a reasonable structural stability.

Publication Date


  • 2020

Citation


  • Han, J. K., Liss, K. D., Langdon, T. G., Jang, J. I., & Kawasaki, M. (2020). Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system. Materials Science and Engineering A, 796. doi:10.1016/j.msea.2020.140050

Scopus Eid


  • 2-s2.0-85089431094

Web Of Science Accession Number


Volume


  • 796

Abstract


  • The mechanical properties and structural stability of a high-pressure torsion (HPT)-induced bulk nanostructured metastable Al–Mg system were examined after natural aging at room temperature for 60 days. The sample demonstrated a high yield strength of 1.3–1.5 GPa with an excellent plasticity by achieving a high strain rate sensitivity of 0.036. The high hardness is attributed to the concurrent contributions of grain refinement and solid solution strengthening. An X-ray diffraction analysis revealed a high compositional microstrain of ~0.0202 due to the supersaturation of Mg in the Al matrix after processing. This microstrain increased to ~0.0274 after natural aging due to the heterogeneous distribution of supersaturated Mg solutes without any nucleation of a second phase, thereby demonstrating a reasonable structural stability.

Publication Date


  • 2020

Citation


  • Han, J. K., Liss, K. D., Langdon, T. G., Jang, J. I., & Kawasaki, M. (2020). Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system. Materials Science and Engineering A, 796. doi:10.1016/j.msea.2020.140050

Scopus Eid


  • 2-s2.0-85089431094

Web Of Science Accession Number


Volume


  • 796