Saxs and tem study of the kinetics of phase separation in Al-Zn

Forouhi, A. Rahim; Fontaine, D. de

doi:10.1016/0001-6160(87)90132-5

Cited by 31 publications

(10 citation statements)

References 43 publications

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“…A t 1/3 growth law is also occasionally observed for advanced stages in more concentrated systems, e.g. in AI-22at.% Zn-0.1 at.% Mg (Forouhi & de Fontaine, 1987) and Fe-Cr (Katano & Iizumi, 1984), although several theoretical calculations predict a larger exponent. As an example for a late-time behaviour, Fig.…”

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 91%

“…The late-time model has recently been extended (see Fig. 2) 0-1 at.% Mg ageing at 398 K (late-time behaviour) according to Forouhi & de Fontaine (1987). Ageing times are given in minutes.…”

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 99%

“…In the Tokuyama, Enomoto & Kawasaki (1987); HF: ; FL: Fratzl & Lebowitz (1989). e: Pt-40 at.% Au (Singhal, Herman & Kostorz, 1978); t~: AI-5-3, -6.8 at.% Zn (Hennion, Ronzaud & Guyot, 1982); o: AI-6"8, -10 at.% Zn(Mg) (Komura, Osamura, Fuji & Takeda, 1985); V: A1-12-1 at.% Zn (Guyot & Simon, 1982); A: AI-22 at.% Zn(Mg) (Forouhi & de Fontaine, 1987); ~: Al-12, -22, -32 at.% Zn ; ~: AI-4, -6-8at.% Zn(Mg) (Komura, Takeda, Osamura, & Okuda, 1988); I1: Cu-33at.% Mn (Gaulin, Spooner & Morii, 1987); II': Fe-34 at.% Cr (Katano & Iizumi, 1984); A: A1-Li (see . two-phase model including interparticle interference, these authors determine a size-distribution function for spherical particles by fitting a linear combination of cubic splines to reproduce the scattering curves for Q> Qm (Magnani, Puliti & Stefanon, 1988).…”

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 99%

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Small-angle scattering studies of phase separation and defects in inorganic materials

Kostorz¹

1991

J Appl Cryst

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The use of X-ray and neutron small-angle scattering in the study of microstructural changes in inorganic materials is reviewed, with emphasis on recent developments. In the kinetics of diffusion-controlled phase separation, reliable data on the evolution of size and shape of the decomposition products may be obtained especially from in situ ageing experiments. Magnetic neutron scattering is discussed for inhomogeneous ferromagnets. While for the structural characterization of binary systems singlewavelength experiments are sufficient, variable X-ray wavelengths now available at synchrotron-radiation facilities open possibilities for the study of partial structure functions in systems containing several components. The combined use of small-angle scattering and complementary techniques is of particular value in more complex cases. These points are illustrated by a survey of recent results on phase separation and precipitates in binary and ternary crystalline alloys and on radiation-induced microstructural changes in metallic and semiconducting materials.

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Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 91%

“…The late-time model has recently been extended (see Fig. 2) 0-1 at.% Mg ageing at 398 K (late-time behaviour) according to Forouhi & de Fontaine (1987). Ageing times are given in minutes.…”

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 99%

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 99%

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Small-angle scattering studies of phase separation and defects in inorganic materials

Kostorz¹

1991

J Appl Cryst

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“…Furukawa (16) cautioned that the x -~ dependence may be valid at intermediate wavenumbers; however, the Porod law of x -~ may be recovered at large q. The recovery of q-4 dependence has already been observed experimentally in metal alloys and in polymer blends (19,20). Recently, Furukawa (16,17) predicted that the slope at q C qm can be much steeper, for example, 3 or 4, depending on the quenched depths.…”

Section: (3)mentioning

confidence: 99%

Phase decomposition in poly-p-phenylene benzobisoxazole/amorphous nylon molecular composites

Chen

Kyu

1993

Journal of Macromolecular Science, Part B

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Miscibility characteristics of poly-p-phenylene benzobisoxazole (PPBO)/amorphous nylon (AN) molecular composites were studied by means of differential scanning calorimetry (DSC), dielectric relaxation, wide-angle x-ray diffraction (WAXD), and light scattering. The solutionmixed PPBO/AN exhibited a systematic movement of a single glass transition temperature (2'') with composition in DSC and dielectric measurements, implying an entrapped single phase of the molecular composites. In the WAXD studies of the 50/50 mixture, two very weak reflection peaks of the PPBO phase and a small amorphous halo of AN were discerned. Light scattering studies showed no detectable level of orientation fluctuations. Upon heating, thermally induced phase separation occurred, with a cloud point phase diagram reminiscent of a lower critical solution temperature (LCST). As typical for entrapped single-phase blends, the phase diagram of LCP blends is irreversible. Nevertheless, several temperature jump experiments were undertaken from ambient temperature to a two-phase temperature region in order to gain further 64 CHEN AND KYU insight into the nonequilibrium behavior. The time-evolution of scattering profiles was analyzed in the context of nonlinear theories and dynamical scaling laws. The kinetic exponent of the phase growth was found to be consistent with the prediction of cluster dynamics proposed by Binder and Stauffer.

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“…The transition from spherical to non-spherical shape manifests itself even in SAS curves of polycrystals by a shoulder (Ref. 44) or the appearance of two distinct straight regimes in a Guinier plot (Ref. 45).…”

Section: Statistically Isotropic Systemsmentioning

confidence: 99%