The growth of decagonal Al–Co–Ni single crystals as a function of chemical composition

Zhang, B.; Estermann, M. A.; Steurer, Walter

doi:10.1557/jmr.1997.0303

Cited by 15 publications

(9 citation statements)

References 19 publications

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“…An X-ray single crystal study on a series of decaprismatic crystals of compositions Al 65-77 Co 3-22 Ni 3-22 , quenched from 800 C, was performed as function of composition and temperature (Zhang, 1995;Zhang, Estermann, Steurer, 1997;Baumgarte, Schreuer, Estermann, Steurer, 1997 11.3 did not show reflection splitting in the low-resolution X-ray precession photographs but "satellite reflections" which have been shown to be related to twinned domain structures of 1D QC (Kalning, Kek, Burandt, Press, Steurer, 1994;Kalning, Press, Kek, 1995;Kalning, Kek, Krane, Dorna, Press, Steurer 1997). Al 72.7 Co 11.6 Ni 15.7 was superstructure I and Al 70.6 Co 6.8 Ni 22.6 the basic Ni-rich d-phase.…”

Section: X-ray Diffraction and Neutron Scatteringmentioning

confidence: 99%

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Steurer¹

2004

Zeitschrift Für Kristallographie - Crystalline Materials

244

102

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Is quasicrystal structure analysis a never-ending story? Why is still not a single quasicrystal structure known with the same precision and reliability as structures of regular periodic crystals? What is the state-of-the-art of structure analysis of axial quasicrystals? The present comprehensive review summarizes the results of almost twenty years of structure analysis of axial quasicrystals and tries to answer these questions as far as possible. More than 2000 references have been screened for the most reliable structural models of pentagonal, octagonal, decagonal and dodecagonal quasicrystals. These models, mainly based on diffraction data and/or on bulk and surface microscopic images are critically discussed together with the limits and potentialities of the respective methods employed.

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Section: X-ray Diffraction and Neutron Scatteringmentioning

confidence: 99%

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Steurer¹

2004

Zeitschrift Für Kristallographie - Crystalline Materials

244

102

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“…A reduction of the particle size is expected for longer alloying time. However, an opposite effect is observed, this could be due to the high ductility, stability and structure of the decagonal phase of the system Ni-CoAl [18][19][20][21][22][23] , in addition to the forming a bimodal/multimodal grain size distribution, that improves the ductility of the nanostructured materials 24 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Microstructural Characterization and Microhardness of AlCoNi-SiC Composite Prepared by Mechanical Alloying

et al. 2017

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Equiatomic AlCoNi alloy matrix were reinforced by the dispersion of SiC nanoparticles (SiCnp) using the mechanical alloying process. The metallic powders were milled for 10, 20 and 30 h and sintered at 1200 0C under vacuum. Through particle size distribution, X-ray diffraction and scanning electron microscopy investigations, the mechanically alloyed powders for 10 h were selected to be reinforced with SiCnp (2.5, 5 and 10 wt.%). The microstructural features, and improvement in microhardness and porosity of sintered AlCoNi-SiC composites were investigated as a function of SiCnp content. Microhardness Vickers test showed that the enhanced microhardness of the AlCoNi-SiCnp composite could be attributed to the decrease of porosity in comparison to the AlCoNi alloy.

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“…By systematic variation of the chemical composition of Al± ±Co± ±Ni alloys (Baumgarte et al, 1997;Zhang et al, 1997;Kalning, Kek, Burandt, Press, Steurer, 1994), or by extended annealing (Grushko et al, 1998) a similar transition from periodic to aperiodic state can be observed. This transition is of crucial importance for understanding the formation and growth of quasicrystals.…”

Section: In-situ Measurements At High-temperaturementioning

confidence: 92%

“…(cf. Zhang, Estermann, Steurer, 1997;Baumgarte, Schreuer, Estermann, Steurer, 1997). Although, there are many examples of highly anisotropic diffuse scattering which demand for high resolution in particular directions, high-resolution diffractometry is not necessarily required if resolution in reciprocal space is not the prime issue.…”

Section: Diffuse Scattering In Quasicrystalsmentioning

confidence: 99%

“…This is actually the case for many decagonal quasicrystals (cf. Zhang, Estermann, Steurer, 1997;Baumgarte, Schreuer, Estermann, Steurer, 1997). However, since resolution in reciprocal space is not the prime issue for the study of broad and extended diffuse scattering phenomena, we adopted a different strategy by abandoning the classical diffractometry in favour of area detectors with medium resolution.…”

Section: Introductionmentioning

confidence: 99%

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Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

Estermann¹,

Lemster²,

Haibach³

et al. 2000

Zeitschrift Für Kristallographie - Crystalline Materials

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Methods based on X-ray area detectors are presented for acquiring and analysing single-crystal X-ray diffraction data from quasicrystals and approximants. These methods are complementary to high-resolution diffractometry and fully exploit the possibilities of modern two-dimensional X-ray detector systems (imaging plates and charge coupled devices) such as the on-line read-out capability and the possibility to collect large volumes of reciprocal space in a quantitative and rapid way. In contrast to a classical point detector, area detectors allow the measurement of a very large number of Bragg reflections in a reasonable time scale, as is shown with a large unitcell periodic approximant in the Al± ±Co± ±Ni alloy system. For large approximants exhibiting strong pseudosymmetry, direct methods for structure solution usually fail. Recently implemented Patterson deconvolution techniques are shown to succeed. The extension of techniques for area detectors ± ± beyond the standard application of collecting integrated Bragg intensities ± ± to the quantitative acquisition of continuous and diffuse scattering data is presented with particular emphasis on quasicrystals. One of the key techniques is the quantitative reconstruction of undistorted layers and volumes in reciprocal space. This is crucial for developing and comparing possible models for structural disorder in quasicrystals. Examples for decagonal Al± ±Co± ±Ni and icosahedral Al± ±Mn± ±Pd are given in respect to possibilities and limitations of X-ray area detectors.

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The growth of decagonal Al–Co–Ni single crystals as a function of chemical composition

Cited by 15 publications

References 19 publications

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Synthesis, Microstructural Characterization and Microhardness of AlCoNi-SiC Composite Prepared by Mechanical Alloying

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

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