Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays

Jae Kyung Han; Kunihisa Sugimoto; Megumi Kawasaki; Klaus Dieter Liss

doi:10.1016/j.matlet.2022.132414

Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays

Jae Kyung Han, Kunihisa Sugimoto, Megumi Kawasaki, Klaus Dieter Liss

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

7 Scopus citations

Abstract

This study highlights the capability of high-energy synchrotron X-rays to investigate polymorphous phase transformation upon nanostructuring and diffusion bonding of Al and Mg through high-pressure torsion. The measurements providing diffraction peak profiles at a series of local positions over the sample volume allow mapping of gradual yet significant structural changes in the Al-Mg nanocrystalline alloy. The diffraction peaks involve apparent grain refinement broadening and compositional broadening with increasing shear strain. The results reveal strain-dependent transformations between f.c.c and h.c.p. phases with a sharp dissolution at strains of ∼2500 and subsequent homogenization towards the formation of an Al supersaturated solid solution with the Mg concentration of ∼14–15 at.%.

Original language	English
Article number	132414
Journal	Materials Letters
Volume	321
DOIs	https://doi.org/10.1016/j.matlet.2022.132414
State	Published - Aug 15 2022
Externally published	Yes

Funding

This study was supported by the National Science Foundation of the United States under Grant No. DMR-1810343. The authors acknowledge the Japan Synchrotron Radiation Research Institute for granting beam time and logistics on beamline BL02B1 at SPring-8 under Proposal No. 2018B1219. Synchrotron data under Proposal No. 2018B1219 was recorded using SPEC software and corresponding SPEC-file ‘190201_dieter.dat’. Detector images were taken into the files named ‘pe_CcdNum_AverageResult.his’. For the CeO2 calibration, the scan number is #S5016 with ‘CcdNum’ of 11565, and those for the reported specimen set has numbers of #S5022-#S5239 with 11729-11946, respectively. This study was supported by the National Science Foundation of the United States under Grant No. DMR-1810343. The authors acknowledge the Japan Synchrotron Radiation Research Institute for granting beam time and logistics on beamline BL02B1 at SPring-8 under Proposal No. 2018B1219.

Funders	Funder number
National Science Foundation	DMR-1810343, 2018B1219, 11565

Keywords

Aluminum alloy
Heterostructure
High-energy X-rays
High-pressure torsion
Phase transformation

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10.1016/j.matlet.2022.132414

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title = "Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays",

abstract = "This study highlights the capability of high-energy synchrotron X-rays to investigate polymorphous phase transformation upon nanostructuring and diffusion bonding of Al and Mg through high-pressure torsion. The measurements providing diffraction peak profiles at a series of local positions over the sample volume allow mapping of gradual yet significant structural changes in the Al-Mg nanocrystalline alloy. The diffraction peaks involve apparent grain refinement broadening and compositional broadening with increasing shear strain. The results reveal strain-dependent transformations between f.c.c and h.c.p. phases with a sharp dissolution at strains of ∼2500 and subsequent homogenization towards the formation of an Al supersaturated solid solution with the Mg concentration of ∼14–15 at.%.",

keywords = "Aluminum alloy, Heterostructure, High-energy X-rays, High-pressure torsion, Phase transformation",

author = "Han, {Jae Kyung} and Kunihisa Sugimoto and Megumi Kawasaki and Liss, {Klaus Dieter}",

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doi = "10.1016/j.matlet.2022.132414",

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T1 - Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays

AU - Han, Jae Kyung

AU - Sugimoto, Kunihisa

AU - Kawasaki, Megumi

AU - Liss, Klaus Dieter

PY - 2022/8/15

Y1 - 2022/8/15

N2 - This study highlights the capability of high-energy synchrotron X-rays to investigate polymorphous phase transformation upon nanostructuring and diffusion bonding of Al and Mg through high-pressure torsion. The measurements providing diffraction peak profiles at a series of local positions over the sample volume allow mapping of gradual yet significant structural changes in the Al-Mg nanocrystalline alloy. The diffraction peaks involve apparent grain refinement broadening and compositional broadening with increasing shear strain. The results reveal strain-dependent transformations between f.c.c and h.c.p. phases with a sharp dissolution at strains of ∼2500 and subsequent homogenization towards the formation of an Al supersaturated solid solution with the Mg concentration of ∼14–15 at.%.

AB - This study highlights the capability of high-energy synchrotron X-rays to investigate polymorphous phase transformation upon nanostructuring and diffusion bonding of Al and Mg through high-pressure torsion. The measurements providing diffraction peak profiles at a series of local positions over the sample volume allow mapping of gradual yet significant structural changes in the Al-Mg nanocrystalline alloy. The diffraction peaks involve apparent grain refinement broadening and compositional broadening with increasing shear strain. The results reveal strain-dependent transformations between f.c.c and h.c.p. phases with a sharp dissolution at strains of ∼2500 and subsequent homogenization towards the formation of an Al supersaturated solid solution with the Mg concentration of ∼14–15 at.%.

KW - Aluminum alloy

KW - Heterostructure

KW - High-energy X-rays

KW - High-pressure torsion

KW - Phase transformation

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VL - 321

JO - Materials Letters

JF - Materials Letters

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ER -

Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays

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