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Structural Characterization of AlCuFe Melt-Spun Alloy by X-ray, Neutron Diffraction, High-Resolution Electron Microscopy and Mössbauer Spectroscopy.
Materials (Basel)
December 2020
Wigner Research Centre for Physics, Konkoly Thege út 29-33, H-1121 Budapest, Hungary.
The aim of the work was to characterize the structure of AlCuFe alloy obtained with the use of conventional casting and rapid solidification-melt-spinning technology. Based on the literature data, the possibility of an icosahedral quasicrystalline phase forming in the Al-Cu-Fe was verified. Structure analysis was performed based on the results of X-ray diffraction, neutron diffraction, Fe Mössbauer and transmission electron microscopy.
View Article and Find Full Text PDFFirst synthesis of a unique icosahedral phase from the Khatyrka meteorite by shock-recovery experiment.
IUCrJ
May 2020
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Firenze I-50121, Italy.
Icosahedral quasicrystals (i-phases) in the Al-Cu-Fe system are of great interest because of their perfect quasicrystalline structure and natural occurrences in the Khatyrka meteorite. The natural quasicrystal of composition AlCuFe, referred to as i-phase II, is unique because it deviates significantly from the stability field of i-phase and has not been synthesized in a laboratory setting to date. Synthetic i-phases formed in shock-recovery experiments present a novel strategy for exploring the stability of new quasicrystal compositions and prove the impact origin of natural quasicrystals.
View Article and Find Full Text PDFBulk metallic glass formation in the (Ti,Zr)-(Ni,Cu)-S system.
J Phys Condens Matter
June 2020
Chair of Metallic Materials, Saarland University, Saarbrücken, Germany. Amorphous Metal Solutions GmbH, Homburg, Germany.
New bulk glass-forming alloy compositions, exceeding a critical casting thickness of 1 mm, are developed in the (quasi-ternary) (Ti,Zr)-(Ni,Cu)-S system. The ternary eutectic composition TiNiCu is stepwise modified through additions of S (0-8 at%) and Zr (0-22.5 at%) at the expense of Ni and Ti, respectively.
View Article and Find Full Text PDFThree-Dimensional Icosahedral Phase Field Quasicrystal.
Phys Rev Lett
August 2016
Department of Applied Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom.
We investigate the formation and stability of icosahedral quasicrystalline structures using a dynamic phase field crystal model. Nonlinear interactions between density waves at two length scales stabilize three-dimensional quasicrystals. We determine the phase diagram and parameter values required for the quasicrystal to be the global minimum free energy state.
View Article and Find Full Text PDFQuasicrystal-reinforced Mg alloys.
Sci Technol Adv Mater
April 2014
Department of Materials Science and Engineering, Center for Non-Crystalline Materials, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea.
The formation of the icosahedral phase (I-phase) as a secondary solidification phase in Mg-Zn-Y and Mg-Zn-Al base systems provides useful advantages in designing high performance wrought magnesium alloys. The strengthening in two-phase composites (I-phase + -Mg) can be explained by dispersion hardening due to the presence of I-phase particles and by the strong bonding property at the I-phase/matrix interface. The presence of an additional secondary solidification phase can further enhance formability and mechanical properties.
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