The successive phase transformation in a Co-rich Al–Ni–Co decagonal phase

Yamamoto, Kazuo; Yang, Wei; Nishimura, Yutsuki; Matsuo, Yoshie

doi:10.1016/s0925-8388(02)00183-4

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…This is the same type of approximant phase as that reported to be stable below 1103 K in the present alloy system by Denoyer et al 13 This phase has also been found in the Al-Ni-Co system 40,41 and several groups have investigated the transition behaviors from a decagonal quasicrystal to the 1D approximant phase and/or those from a decagonal quasicrystal to a lower-order approximant phase via the 1D approximant phase as a transient state. 30,31,33,34 …”

Section: Resultsmentioning

confidence: 99%

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

Edagawa

Mandal²,

Hosono

et al. 2004

Phys. Rev. B

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Transition process from a rational approximant state, which is regarded as containing a uniform phason strain in a quasicrystalline state, to the quasicrystalline state in the Al-Cu-Co-Si system has been observed by in situ high-temperature high-resolution transmission electron microscopy (HRTEM). The tiling pattern changing with lapse of time in the HRTEM image has been analyzed, and the spatial and temporal variations of the phason field have been deduced. The results show that two types of processes lead the phason-strain relaxation: one is the shrink of the area with the uniform strain by shifting the boundaries and the other a continuous strain-relaxation in the area outside of the boundary. Such processes arise from a combination of collective and successive phason flips like domino-toppling along different symmetry directions.

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Section: Resultsmentioning

confidence: 99%

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

Edagawa

Mandal²,

Hosono

et al. 2004

Phys. Rev. B

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“…In particular, a linear phason strain results in peak shifts from the ideal Bragg positions. The peak shifts increase with the values of |G ⊥ | [10]. On the other hand, a random phason strain causes peak broadening proportional to the |G ⊥ | values [11].…”

Section: Introductionmentioning

confidence: 96%

Diffuse scattering from an Al₇₂Ni₂₀Co₈decagonal quasicrystal on an order disorder transformation

Abe

Saitoh

Ueno

et al. 2003

J. Phys.: Condens. Matter

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Non-uniform distortion induced by superstructure domains has been observed during the ordering process of an order-disorder transformation in a single decagonal quasicrystal of Al 72 Ni 20 Co 8 . The full width at half maximum (FWHM) of the fundamental reflections increased below the transformation temperature, T c . At the same time, the integrated intensity of the fundamental reflections varied drastically at T c . A small hysteresis was also observed in the temperature dependences of both the FWHM and the integrated intensity of the fundamental reflections. Peak broadening of the fundamental reflections is predominantly dependent on |G | below T c . In addition, the weak dependence of the peak broadening with |G ⊥ | is extracted from the observed FWHM of the fundamental reflections. After deconvolution, the FWHM of the fundamental reflections appears to be a linear combination of |G | and |G ⊥ |. Coexistence of the non-uniform distortion and of the random phason strain contributes to the ordering process below T c . The diffuse scattering from atomic short-range order (SRO) was distributed around the ideal positions of the superstructure reflections. The SRO diffuse scattering disappeared completely above T c + 10 K. In addition, a small hysteresis of the SRO diffuse scattering was found in the temperature cycle.

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“…We have already reported X-ray studies of successive transformation from a decagonal quasicrystal through one-dimensional quasicrystal to an approximant quasicrystal at an Al 72:7 Ni 8:5 Co 18:8 composition. 16,17) In the decagonal phase of the Al 72:7 Ni 8:5 Co 18:8 composition, the coexistence of random phason strains with phonon strains was observed. However, the quantitative estimation of the coexistence has not been performed.…”

Section: Introductionmentioning

confidence: 97%

Synchrotron X-ray Studies of Phason and Phonon Strains in a Co-rich Al-Ni-Co Decagonal Quasicrystal

et al. 2004

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Peak broadening and peak shifts of Bragg reflections were studied with the synchrotron single-crystal X-ray diffraction method for an Al 72:7 Ni 8:5 Co 18:8 decagonal quasicrystal classified as the 5f state. From the Q ? and Q k dependences of the full width of half maximum (FWHM) of the Bragg reflections along the longitudinal direction, the coexistence of random phason strains with phonon strains was observed. Highresolution synchrotron X-ray measurements could present quantitative estimations of these strains. The value of the random phason strain component is 0:0054 $ ( À11 . The asymmetrical broadening due to the phonon strain shows that the single crystal may be constructed with two kinds of grains that have A 5D values of 0.6273 and 0.6265 nm.

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The successive phase transformation in a Co-rich Al–Ni–Co decagonal phase

Cited by 5 publications

References 7 publications

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

Diffuse scattering from an Al₇₂Ni₂₀Co₈decagonal quasicrystal on an order disorder transformation

Synchrotron X-ray Studies of Phason and Phonon Strains in a Co-rich Al-Ni-Co Decagonal Quasicrystal

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The successive phase transformation in a Co-rich Al–Ni–Co decagonal phase

Cited by 5 publications

References 7 publications

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

In situ high-resolution transmission electron microscopy observation of the phason-strain relaxation process in an Al-Cu-Co-Si decagonal quasicrystal

Diffuse scattering from an Al72Ni20Co8decagonal quasicrystal on an order disorder transformation

Synchrotron X-ray Studies of Phason and Phonon Strains in a Co-rich Al-Ni-Co Decagonal Quasicrystal

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Diffuse scattering from an Al₇₂Ni₂₀Co₈decagonal quasicrystal on an order disorder transformation