Stable quasicrystalline phase in Al-Cu-Fe-Cr coating materials

Li, X. Z.; Marks, Laurence D.; Maciejewski, J.; Fehrenbacher, L.; Zabinski, J.S.; O’Neill, J.P.

doi:10.1007/s11661-002-0129-y

Cited by 18 publications

(3 citation statements)

References 24 publications

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“…Using this approach, the QC formation range can be identified, suggesting this method as an effective tool for discovering potential QC compositions in large compositional regions. Although QC phases forming in the Al-Cu-Fe-Cr system have been previously reported 28–35 , the complete range of QC formation is unknown to date and will be elucidated by the here presented results. In addition, the results obtained in this work can be used for predicting intermetallic phase stability of Al-Cu-Fe sputtered films over a wide compositional and temperature range.…”

Section: Introductionmentioning

confidence: 69%

“…By means of XRD only it is not possible to distinguish between them. However, several publications report that when fabricating an Al-Cu-Fe-Cr QC alloy, a decagonal phase can form if high cooling rates are applied and/or if proper annealing is conducted 5,28,33,35,60 . Dong et al .…”

Section: Resultsmentioning

confidence: 99%

“…35 could demonstrate the formation of the approximant crystalline phase only after annealing at 927 °C. Annealing sputtered films at lower temperatures (450 to 750 °C) lead to the formation of QC phases 28,33,60 . Accordingly, the phase field outlined (Figs 6 and 7) should be constituted of the decagonal phase, rather than the orthorhombic approximant.…”

Section: Resultsmentioning

confidence: 99%

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Formation and stability of complex metallic phases including quasicrystals explored through combinatorial methods

Wolf

Kube

Sohn

et al. 2019

Sci Rep

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Aluminum-based quasicrystals typically form across narrow composition ranges within binary to quaternary alloys, which makes their fabrication and characterization challenging. Here, we use combinatorial approaches together with fast characterization techniques to study a wide compositional range including known quasicrystal forming compositions. Specifically, we use magnetron co-sputtering to fabricate libraries of ~140 Al-Cu-Fe and ~300 Al-Cu-Fe-Cr alloys. The alloys compositions are measured through automated energy dispersive X-ray spectroscopy. Phase formation and thermal stability are investigated for different thermal processing conditions (as-sputtered and annealed at 400 °C, 520 °C and 600 °C for Al-Cu-Fe libraries; annealed at 600 °C for Al-Cu-Fe-Cr libraries) using automated X-ray diffraction and transmission electron microscopy. In both systems the compositional regions across which the quasicrystalline phase forms are identified. In particular, we demonstrate that the quasicrystalline phase forms across an unusually broad composition range in the Al-Cu-Fe-Cr system. Additionally, some of the considered alloys vitrify during sputtering, which also allows us to study their nucleation behavior. We find that phases with polytetrahedral symmetry, such as the icosahedral quasicrystal and the λ-Al 13 Fe 4 phase, exhibit higher nucleation rates but lower growth rates, as compared to other phases with a lower degree of polytetrahedral order. Altogether, the here used combinatorial approach is powerful to identify compositional regions of quasicrystals.

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Section: Introductionmentioning

confidence: 69%