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Title: On the kinetic and equilibrium shapes of icosahedral Al 71Pd 19Mn 10 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. Here, our 4D studies (i.e., space- and time-resolved) provide direct evidence that indicates the growth process of an Al 71Pd 19Mn 10 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.

Authors:
 [1];  [2];  [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1438229
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 146; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Al-Pd-Mn; Equilibrium shape; Growth shape; Quasicrystals; X-ray tomography

Citation Formats

Senabulya, Nancy, Xiao, Xianghui, Han, Insung, and Shahani, Ashwin J. On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals. United States: N. p., 2018. Web. doi:10.1016/j.scriptamat.2017.11.049.
Senabulya, Nancy, Xiao, Xianghui, Han, Insung, & Shahani, Ashwin J. On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals. United States. doi:10.1016/j.scriptamat.2017.11.049.
Senabulya, Nancy, Xiao, Xianghui, Han, Insung, and Shahani, Ashwin J. Tue . "On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals". United States. doi:10.1016/j.scriptamat.2017.11.049. https://www.osti.gov/servlets/purl/1438229.
@article{osti_1438229,
title = {On the kinetic and equilibrium shapes of icosahedral Al71Pd19Mn10 quasicrystals},
author = {Senabulya, Nancy and Xiao, Xianghui and Han, Insung and Shahani, Ashwin J.},
abstractNote = {The dynamics of growth and relaxation of icosahedral single quasicrystals in a liquid phase were investigated using in situ synchrotron-based X-ray tomography. Here, 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.},
doi = {10.1016/j.scriptamat.2017.11.049},
journal = {Scripta Materialia},
number = C,
volume = 146,
place = {United States},
year = {2018},
month = {3}
}

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Figures / Tables:

Figure 1 Figure 1: (a) Post-processed 2D reconstructed slice of 3D rod sample (see inset schematic) at 420s (893 ˚C), wherein differences in attenuation provide contrast in image, e.g., light grey corresponds to the solid i-QC (boxed), dark grey to the liquid, and black to air. Also visible are three small poresmore » within the solid i-QC. Even though the QC is growing, the solid-liquid interfaces are readily identifiable. Scale bar is 100μm. The specimen $\hat{z}$ direction is coming out of the page and gravity points into the page. (b) Reconstructed 3D i-QC (red) generated by stacking 2D reconstruction slices, shown with the oxide skin (Al2O3) in yellow. (c) Stereographic projection of local interfacial normal vectors corresponding to (b). The zone axis is $\hat{z}$. The color-bar represents the probability of finding a patch of interface oriented in a specific direction.« less

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