Al-Mn quasicrystal aggregates with icosahedral morphological symmetry

Nissen, H.‐U.; Wessicken, R.; Beeli, C.; Csanády, Ágnes

doi:10.1080/13642818808211230

Cited by 28 publications

(9 citation statements)

References 8 publications

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“…The same orientation of growth direction has been found in i-A1LiCu (Gaybe, 1987) and in i-TiFeMnSi (Zhang & Kelton, 1992). Nevertheless, it has been reported in a number of studies that growth from the liquid may be most rapid along the threefold direction (Shaefer, Bendersky, Shechtman, Boettinger & Biancaniello, 1986;Nissen, Wesichen, Beeli & Gsanady, 1988). Thus, the crystalloraphic orientation of the growth direction is likely to depend on particular nucleation and growth conditions.…”

Section: Textures Of Melt Spinningmentioning

confidence: 75%

On the Anisotropy of Quasicrystal Structures

Divinski¹,

Dnieprenko²

1996

Acta Cryst Sect A

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Textures of melt-spun icosahedral and decagonal quasicrystals have been analysed via texture simulation by a sum of limited fibre components. The model has been extended to include the axial textures with an anisotropic spread of the texture axis. An orientation distribution function of the textured icosahedral quasicrystal has been calculated. It is shown that textured decagonal structures may exhibit an anisotropy of physical properties even in the ribbon plane. may calculate half of the series-expansion coefficients for cubic crystalline symmetry (only even coefficients), only 30% of the coefficients may be obtained for hexagonal crystals (Bunge, 1987).The ghost phenomena of ODF reproduction may be by-passed by the direct ODF approximation in an analytical form. This paper deals with the investigation and simulation of textures (both pole figures and ODFs) of the quasicrystal phases with icosahedral and decagonal symmetries.

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Section: Textures Of Melt Spinningmentioning

confidence: 75%

On the Anisotropy of Quasicrystal Structures

Divinski¹,

Dnieprenko²

1996

Acta Cryst Sect A

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“…Chemical analysis by inductively coupled plasma optical emission spectroscopy yielded a composition of 70.5 at% Al, 21.0 at% Pd and 8.5 at% Mn. From this rod cuboid samples of 2x2x10 mm 3 were cut by spark erosion with the long axis parallel to the fivefold direction of the quasicrystal lattice.…”

Section: Methodsmentioning

confidence: 99%

“…For example, a dodecahedral or triacontahedral outer shape has been observed for icosahedral quasicrystals of Al-Li-Cu [2], Al-Mn [3], AlCu-Fe, [4] and Mg-Ga-Zn [5] grown under suitable conditions. Besides the outer morphology of these quasicrystals, faceted voids have sometimes been observed inside icosahedral Al-Pd-Mn quasicrystals [6].…”

Section: Introductionmentioning

confidence: 99%

Novel Morphology of Voids in Single-Quasicrystalline Icosahedral Al_70.5Pd_21.0Mn_8.5

Waseda

Suzuki

Urbanb

1998

Zeitschrift Für Naturforschung A

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This paper deals with the morphology and surface chemistry of faceted voids existing in singlequasicrystalline icosahedral Al 70 5 Pd 2 i. 0 Mn 8 5 . By observation with a scanning electron microscope of surfaces obtained by cleavage of the quasicrystal, the habit planes of the dodecahedral voids were identified. The chemical surface composition of the void surface was determined by Auger electron spectroscopy after cleavage in ultra-high vacuum.

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“…Much work [2][3][4][5] has been concerned with identification, microstructure, composition and stability of IQC in A1-Mn alloys. Recently, some studies [6][7][8] examined the morphology of IQC formed under the different conditions, determining that the morphology of many IQC has an icosahedral symmetry, the same as the microstructures. However, a few studies centred on the formation of the unique morphology of IQC, especially on the relation between a cooling rate and morphology.…”

mentioning

confidence: 99%

Solidified morphology and stability of solid-liquid interface of icosahedral quasicrystal in a rapidly solidified Al-Mn alloy

Cheng

Zhang

1991

J Mater Sci Lett

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The icosahedral quasicrystal (IQC) discovered by Shechtman et al. [1] in rapidly solidified A1-Mn alloys has a unique symmetry and striking morphology which is different from that of the crystal and is amorphous. In consequence this has stimulated considerable interest. Much work [2][3][4][5] has been concerned with identification, microstructure, composition and stability of IQC in A1-Mn alloys. Recently, some studies [6][7][8] examined the morphology of IQC formed under the different conditions, determining that the morphology of many IQC has an icosahedral symmetry, the same as the microstructures. However, a few studies centred on the formation of the unique morphology of IQC, especially on the relation between a cooling rate and morphology.We [9] ,studied the relation between the solidified morphology of IQC and the composition of the alloys, the, mean cooling rates in some A1-Mn alloys based on the published papers, and we pointed out that the morphology of IQC can be divided into three categories: equiaxial grains with a planar face, spherulites with a small protrusion and dendritic grains, which are something like that of a solidified crystal. We presented a morphological stability theory (MST) [10] which has been applied successfully in rapidly solidified (RS) crystalline alloys and can be used to predict the solidified morphology of IQC. In this paper, however, we investigated the morphology of IQC solidified at different cooling rates in an RS A1-8.2 at % manganese alloy and we analysed the formation of the unique morphology of IQC based on the stability of the solid-liquid interface and the symmetry of the microstructures. A1-8.2 at% manganese cast alloy used in this research was prepared with pure aluminium (99.99 mass %) and manganese (99.9 mass %) by melting in an argon atmosphere. Then the cast alloy was proce.ssed by melt spinning into ribbons -4 mm wide. Three different peripheral wheel speeds, v, were used to vary the ribbon thickness and ribbons B-1 to B-3, with the different cooling rates, were obtained, The values of v and thickness d of the ribbons B-1 to B-3 were summarized in Table I. The average cooling rates i# (Ks -1) of all ribbons were estimated at the 106 order of magnitude with an empirical relation between i/" and d [11]. The microstructures of each ribbon were examined with a Hitachi-450 scanning microscope (SEM) and EM-400T and an H-800 electron microscope (TEM). X-ray diffraction analysis was also made on these ribbons. Since the microstructures of a ribbon change along the cross-section, because of variation inthe cooling rate, the ribbons (before being studied in TEM) were worn off a little bit from the wheel side or the free surface of the wheel side and the free surface, respectively, so that the zone near the free surface or the zone near the wheel side or the middle zone of a ribbon could be analysed.The results of X-ray diffraction indicate that all ribbons consist of ol-A1 and IQC besides few A16 Mn in B-3 although the relative contents of IQC are different in each rib...

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Al-Mn quasicrystal aggregates with icosahedral morphological symmetry

Cited by 28 publications

References 8 publications

On the Anisotropy of Quasicrystal Structures

On the Anisotropy of Quasicrystal Structures

Novel Morphology of Voids in Single-Quasicrystalline Icosahedral Al_70.5Pd_21.0Mn_8.5

Solidified morphology and stability of solid-liquid interface of icosahedral quasicrystal in a rapidly solidified Al-Mn alloy

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Al-Mn quasicrystal aggregates with icosahedral morphological symmetry

Cited by 28 publications

References 8 publications

On the Anisotropy of Quasicrystal Structures

On the Anisotropy of Quasicrystal Structures

Novel Morphology of Voids in Single-Quasicrystalline Icosahedral Al70.5Pd21.0Mn8.5

Solidified morphology and stability of solid-liquid interface of icosahedral quasicrystal in a rapidly solidified Al-Mn alloy

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Novel Morphology of Voids in Single-Quasicrystalline Icosahedral Al_70.5Pd_21.0Mn_8.5