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

Jae Kyung Han; Klaus Dieter Liss; Terence G. Langdon; Jae il Jang; Megumi Kawasaki

doi:10.1016/j.msea.2020.140050

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

Jae Kyung Han, Klaus Dieter Liss, Terence G. Langdon, Jae il Jang, Megumi Kawasaki

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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.

Original language	English
Article number	140050
Journal	Materials Science and Engineering: A
Volume	796
DOIs	https://doi.org/10.1016/j.msea.2020.140050
State	Published - Oct 7 2020
Externally published	Yes

Funding

This study was supported in part by the National Science Foundation of the United States under Grant No. DMR-1810343 ; in part by the National Research Foundation of Korea (NRF) grants funded by MSIT (No. 2020R1A2B5B01001446 and No. 2020R1A5A6017701 ); and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS .

Keywords

Grain refinement
High-pressure torsion
Metastable phase
Plasticity
X-ray diffraction

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10.1016/j.msea.2020.140050

Cite this

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title = "Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system",

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 \textasciitilde{}0.0202 due to the supersaturation of Mg in the Al matrix after processing. This microstrain increased to \textasciitilde{}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.",

keywords = "Grain refinement, High-pressure torsion, Metastable phase, Plasticity, X-ray diffraction",

author = "Han, \{Jae Kyung\} and Liss, \{Klaus Dieter\} and Langdon, \{Terence G.\} and Jang, \{Jae il\} and Megumi Kawasaki",

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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

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 - https://www.scopus.com/pages/publications/85089431094

U2 - 10.1016/j.msea.2020.140050

DO - 10.1016/j.msea.2020.140050

M3 - Article

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VL - 796

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 140050

ER -

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

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Keywords

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