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

TY - JOUR

T1 - Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system

AU - Han, Jae Kyung

AU - Liss, Klaus Dieter

AU - Langdon, Terence G.

AU - Jang, Jae il

AU - Kawasaki, Megumi

N1 - Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/10/7

Y1 - 2020/10/7

N2 - 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.

AB - 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.

KW - Grain refinement

KW - High-pressure torsion

KW - Metastable phase

KW - Plasticity

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=85089431094&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2020.140050

DO - 10.1016/j.msea.2020.140050

M3 - 文章

AN - SCOPUS:85089431094

VL - 796

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

M1 - 140050

ER -