Formation of AlCuFe icosahedral quasicrystal by mechanical alloying: XAFS and XRD studies

Yin, Sheng; Xie, Zhi; Bian, Qing; He, Bo; Pan, Zhiyun; Sun, Zhihu; Wei, Zhiguo; Qian, Liying; Wei, Shiqiang

doi:10.1016/j.jallcom.2007.01.058

Cited by 20 publications

(14 citation statements)

References 31 publications

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“…This indicates that the w-phase forms only in the unmilled powders after annealing and/or at low-temperature annealing after shorter time of milling (annealing at 600 • C after 5 and 10 h of milling). This is supported by the earlier reports of Barua et al [14], Yin et al [16] and Yong et al [17]. However, XRD patterns of the powders annealed at 800 • C after 20, 30, 60 and 80 h of milling showed a series of λ-phases, and the intensity of the λ-phase increased with increasing milling time from 20 to 80 h. This suggests that the highest concentration of λ-phase forms at longertime milling after high-temperature annealing (80 h milling after annealing at 800 • C in the present case).…”

Section: Resultssupporting

confidence: 90%

“…It is clearly seen that i-phase was not formed in the mechanically alloyed Al 70 Cu 20 Fe 10 powders. Yin et al [16] have reported similar results for the Al 70 Cu 20 Fe 10 powders. They have reported that QC phase did not form directly in the mechanically alloyed Al 70 Cu 20 Fe 10 powders milled for up to 40 h. However, the presence of β-phase in Al 70 Cu 20 Fe 10 alloy suggested that the composition of this alloy is outside the i-phase field.…”

Section: Experimental Methodsmentioning

confidence: 58%

“…Barua et al [14] synthesized a QC phase in Al 70 Cu 20 Fe 10 after milling for 30 h. Murty et al [15] have reported that MA of Al 70 Cu 20 Fe 10 up to 40 h has lead to the formation of an almost single i-phase and after 60 h of milling the i-phase completely transformed to the β-Al(Cu,Fe) phase (β-phase). Yin et al [16] have recently reported that QC phase did not form directly in Al 70 Cu 20 Fe 10 powders milled for up to 40 h. However, Murty et al [15] have also reported that 20 h of milling directly introduces the formation of i-phase for Al 65 Cu 20 Fe 15 powders, and continuous milling up to 40 h led to the dissolution of i-phase into a single β-phase. On the other hand, Yong et al [17] have showed that for Al 65 Cu 20 Fe 15 powder mixture, the i-phase did not form directly from the milling process, and i-phase was formed only after heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders

Göğebakan

Avar

2011

Pramana - J Phys

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Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600-800 • C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al 70 Cu 20 Fe 10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al 70 Cu 20 Fe 10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600 • C. The β-phase was one of the major phases in the Al 70 Cu 20 Fe 10 alloy. The w-Al 7 Cu 2 Fe 1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.

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Section: Resultssupporting

confidence: 90%

Section: Experimental Methodsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders

Göğebakan

Avar

2011

Pramana - J Phys

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“…Some weak unidentified peaks occur for all milling times. Similar results were obtained in several works using planetary mills and longer milling times 2,8,[9][10][11][12] , although the presence of β or even ψ phases, besides the θ phase, are also reported in these works. The presence of X-ray diffraction lines from the elementary powders after 2 and 3 hours of milling made difficult the identification of other phases having diffraction lines at 2θ ranging from 43 to 45° and that were supposed to form.…”

Section: Methodssupporting

confidence: 90%

“…Among these crystalline phases, ω shows a great similarity with the icosaedral ψ phase. The coordination of the Fe atoms is very similar in both structures 2 . From the solidification route, the ψ phase seems to be formed in equilibrium conditions, by a peritectic reaction from a primary crystalline phase 1,3,4 .…”

Section: Introductionmentioning

confidence: 82%

The formation of quasicrystal phase in Al-Cu-Fe system by mechanical alloying

et al. 2012

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In order to obtain quasicrystalline (QC) phase by mechanical alloying (MA) in the Al-Cu-Fe system, mixtures of elementary Al, Cu and Fe in the proportion of 65-20-15 (at. %) were produced by high energy ball milling (HEBM). A very high energy type mill (spex) and short milling times (up to 5 hours) were employed. The resulting powders were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). QC phase was not directly formed by milling under the conditions employed in this work. However, phase transformations identified by DSC analysis reveals that annealing after HEBM possibly results in the formation of the ψ QC phase.

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Some Aspects of Stability and Nanophase Formation in Quasicrystals during Mechanical Milling

Mukhopadhyay

Yadav

2011

Israel Journal of Chemistry

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Non‐equilibrium processing and other related techniques can activate quasicrystalline structures to a higher energy level and enable them to attain various stable/metastable structures. During mechanical milling of quasicrystalline alloys, the stability of the complex structures is of immense importance from a scientific and technological point of view. The evolution of nanoquasicrystalline, nanocrystalline, and amorphous phases and their composites has been observed in the course of milling. The experimental results for mechanical alloying of elemental powders (required for the synthesis of quasicrystals) and mechanical milling of quasicrystals are discussed. The salient features observed in quasicrystals during other non‐equilibrium processing are highlighted. Nanospinel formation from the Al‐based quasicrystalline precursor is mentioned.

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Formation of AlCuFe icosahedral quasicrystal by mechanical alloying: XAFS and XRD studies

Cited by 20 publications

References 31 publications

Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders

Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders

The formation of quasicrystal phase in Al-Cu-Fe system by mechanical alloying

Some Aspects of Stability and Nanophase Formation in Quasicrystals during Mechanical Milling

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