On the kinetic and equilibrium shapes of icosahedral Al₇₁Pd₁₉Mn₁₀ quasicrystals

Journal Article · 06 March 2018 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2017.11.049 · OSTI ID:1438229

Senabulya, Nancy ^[1]; Xiao, Xianghui ^[2]; Han, Insung ^[1]; Shahani, Ashwin J. ^[1]

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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)

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1438229
• Journal Information: Scripta Materialia, Vol. 146, Issue C; ISSN 1359-6462
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English