Atomic structure of the Al–Cu–Fe–Si 1/1-cubic approximant

Takeuchi, Tsunehiro; Yamada, Hiroshi; Takata, Masaki; Nakata, T.; Tanaka, Nobuo; Mizutani, Uichiro

doi:10.1016/s0921-5093(00)01198-9

Cited by 16 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If an icosahedral cluster of m 3 5 symmetry is located at the center of the cubic cell, the lattice turns out to have Pm 3 symmetry. Indeed, many 1/1-1/1-1/1 approximants and the Al-Pd-Mn-Si 2/1-2/1-2/1 approximants were reported to have the Pm 3 symmetry [2][3][4][5]8]. Thus, we assumed that the Al 65 Rh 27 Si 8 2/1-2/1-2/1 approximant has a cubic lattice with the Pm 3 symmetry.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Structure of the Al65Rh27Si8 2/1–2/1–2/1 approximant

Takeuchi

Koshikawa²,

Abe

et al. 2004

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

“…In order to investigate the structure of the Mackaytype quasicrystals and approximants, we performed in the last decade the structure analysis for the Mackaytype 1/1-1/1-1/1 approximants [2][3][4][5]. The periodic structure of the approximants allowed us to make full use of the well-developed Rietveld analysis.…”

Section: Introductionmentioning

confidence: 99%

Structure of the Al65Rh27Si8 2/1–2/1–2/1 approximant

Takeuchi

Koshikawa²,

Abe

et al. 2004

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…Upon short heat treatment, the lattice parameter of the 1/1 cubic-approximant phase in the powder, as determined from the Rietveld method, was found to be 12.3196 Å. Using previously published values, [13,14,16] it appears that, owing to the large atomic size of Al, its substitution by Si leads to a gradual decrease of the lattice parameter of the 1/1 cubic-approximant phase. Since approximant phases are closely related to the icosahedral phase, a quasi-lattice parameter for the 1/ 1 cubic approximant can be calculated.…”

Section: Discussionmentioning

confidence: 72%

“…pct. [13][14][15][16] The preparation and determination of physical properties of quasicrystals are still the focus of numerous investigations. [6] Stable quasicrystals can be prepared by several techniques, including conventional casting and sintering of quasi-crystalline powders.…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering of Al-Si-Cu-Fe quasi-crystalline powder

Fleury

Lee

Kim

et al. 2003

Metall Mater Trans A

View full text Add to dashboard Cite

This article presents the results of a study on the microstructure and mechanical properties of AlSi-Cu-Fe specimens produced by the spark plasma sintering (SPS) technique. The microstructure of the starting powder and bulk specimens was analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The formation of the icosahedral and decagonal quasi-crystalline phases in the as-gas-atomized powders is described for the first time. It is then shown that these metastable phases transformed into the 1/1 cubicapproximant phase upon heating at about 600 °C. Second, the effects of SPS process parameters such as the temperature and time have been investigated. Owing to the generation of a spark discharge between neighboring powder particles, dense cylindrical samples were obtained after a short sintering time of 30 minutes at the temperature of 650 °C. The highest values of the Vickers microhardness, about 8.9 GPa, were obtained when the powders were sintered in the temperature range of 600 °C to 650 °C for a holding time of 30 minutes, while the fracture toughness was found to be inversely proportional to the sintering temperature. However, at the sintering temperature of 650 °C, the fracture toughness increased from about 1.40 to as the holding time increased from 10 to 60 minutes. As compared to cast specimens, the enhanced mechanical properties are explained by the refined microstructure resulting from the low temperature and short sintering time applied during SPS processing.1.52 MPa 1m

show abstract

“…The classical example of the Mackay-type atom cluster in a-AlMnSi has local icosahedral symmetry; it has been frequently used as a fundamental structural unit for the simpleicosahedral quasicrystal (P-type) in Al-Mn-Si alloys [2][3][4][5][6]. Recent systematic analyses of 1/1 approximants in Al-Fe-Cu-Si and Al-Cu-Ru alloys have revealed Mackay-type atom clusters that are chemically and geometrically disordered [7,8]; nevertheless the bodycentered arrangement of atom clusters is common among such 1/1 approximants, suggesting the general importance of these Mackay-type atom clusters. A series of cubic approximants, c-AlCuRuSi, a-AlPdMnSi and b-AlPdMnSi [9][10][11], which are referred to as 1/0, 1/1 and 2/1 approximants, respectively, provide additional structural information for the face-centered (F-type) icosahedral quasicrystals.…”

Section: Introductionmentioning

confidence: 99%