On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals

Nancy Senabulya; Xianghui Xiao; Insung Han; Ashwin J. Shahani

doi:10.1016/j.scriptamat.2017.11.049

On the kinetic and equilibrium shapes of icosahedral Al₇₁Pd₁₉Mn₁₀ quasicrystals

Nancy Senabulya, Xianghui Xiao, Insung Han, Ashwin J. Shahani

Department of Materials Science and Metallurgical Engineering

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

7 Scopus citations

Abstract

The dynamics of growth and relaxation of icosahedral single quasicrystals in a liquid phase were investigated using in situ synchrotron-based X-ray tomography. Our 4D studies (i.e., space- and time-resolved) provide direct evidence that indicates the growth process of an Al₇₁Pd₁₉Mn₁₀ quasicrystal is governed predominantly by bulk transport rather than attachment kinetics. This work is in agreement with theoretical predictions, which show that the pentagonal dodecahedron is not the minimum energy structure in Al-Pd-Mn icosahedral quasicrystals, but merely a growth shape characterized by non-zero anisotropic velocity. This transient shape transforms into a truncated dodecahedral Archimedian polyhedron once equilibrium has been attained.

Original language	English
Pages (from-to)	218-221
Number of pages	4
Journal	Scripta Materialia
Volume	146
DOIs	https://doi.org/10.1016/j.scriptamat.2017.11.049
State	Published - 15 Mar 2018

Keywords

Al-Pd-Mn
Equilibrium shape
Growth shape
Quasicrystals
X-ray tomography

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10.1016/j.scriptamat.2017.11.049

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title = "On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals",

abstract = "The dynamics of growth and relaxation of icosahedral single quasicrystals in a liquid phase were investigated using in situ synchrotron-based X-ray tomography. Our 4D studies (i.e., space- and time-resolved) provide direct evidence that indicates the growth process of an Al71Pd19Mn10 quasicrystal is governed predominantly by bulk transport rather than attachment kinetics. This work is in agreement with theoretical predictions, which show that the pentagonal dodecahedron is not the minimum energy structure in Al-Pd-Mn icosahedral quasicrystals, but merely a growth shape characterized by non-zero anisotropic velocity. This transient shape transforms into a truncated dodecahedral Archimedian polyhedron once equilibrium has been attained.",

keywords = "Al-Pd-Mn, Equilibrium shape, Growth shape, Quasicrystals, X-ray tomography",

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T1 - On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals

AU - Senabulya, Nancy

AU - Xiao, Xianghui

AU - Han, Insung

AU - Shahani, Ashwin J.

PY - 2018/3/15

Y1 - 2018/3/15

N2 - The dynamics of growth and relaxation of icosahedral single quasicrystals in a liquid phase were investigated using in situ synchrotron-based X-ray tomography. Our 4D studies (i.e., space- and time-resolved) provide direct evidence that indicates the growth process of an Al71Pd19Mn10 quasicrystal is governed predominantly by bulk transport rather than attachment kinetics. This work is in agreement with theoretical predictions, which show that the pentagonal dodecahedron is not the minimum energy structure in Al-Pd-Mn icosahedral quasicrystals, but merely a growth shape characterized by non-zero anisotropic velocity. This transient shape transforms into a truncated dodecahedral Archimedian polyhedron once equilibrium has been attained.

AB - The dynamics of growth and relaxation of icosahedral single quasicrystals in a liquid phase were investigated using in situ synchrotron-based X-ray tomography. Our 4D studies (i.e., space- and time-resolved) provide direct evidence that indicates the growth process of an Al71Pd19Mn10 quasicrystal is governed predominantly by bulk transport rather than attachment kinetics. This work is in agreement with theoretical predictions, which show that the pentagonal dodecahedron is not the minimum energy structure in Al-Pd-Mn icosahedral quasicrystals, but merely a growth shape characterized by non-zero anisotropic velocity. This transient shape transforms into a truncated dodecahedral Archimedian polyhedron once equilibrium has been attained.

KW - Al-Pd-Mn

KW - Equilibrium shape

KW - Growth shape

KW - Quasicrystals

KW - X-ray tomography

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JO - Scripta Materialia

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ER -

On the kinetic and equilibrium shapes of icosahedral Al₇₁Pd₁₉Mn₁₀ quasicrystals

Abstract

Keywords

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