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  • International Union of Crystallography (IUCr)  (6)
  • 1
    Electronic Resource
    Electronic Resource
    A small-angle neutron scattering study of the temperature and stress dependence of the microstructure of nimonic alloys (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 583-588 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The creep properties in high-temperature alloys are dependent on the presence of second and higher phase components. In particular in the nimonic group of alloys the size distribution and concentration of the γ′ phase are crucial factors in the resistance to creep. A possible mechanism for degradation of creep resistance is the Ostwald ripening of the γ′ phase. A sample of Nimonic 105 (Trademark of Henry Wiggin and Co. Ltd) was subjected simultaneously to a stress of 500 MPa and a temperature of 800°C in situ in the beam using a specially developed cell on the small-angle scattering facility (D 11A) at the Institut Laue Langevin. Scattering patterns were taken continuously and spectra were recorded every ̃20 min; the macroscopic creep was also recorded. Measurements were taken up to the point of fracture. A peak in the intensity was observed at a scattering vector κ (= 4π sin θ/λ) of 0.005 Å−1 which is believed to be the lowest value at which such an effect has been observed in alloys. The observed variation in the scattering after treatment for multiple scattering and absorption corrections is discussed in terms of particle size and size distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013941
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  • 2
    Electronic Resource
    Electronic Resource
    Long-wavelength neutron scattering studies of the decomposition of Al–Zn alloys (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 127-127 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Determination of whether a spinodal mechanism or a nucleation and growth mechanism giving rise to Guinier–Preston zones is responsible for the initial stages of the decomposition sequence of low-zinc-concentration aluminium alloys at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009806
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the growth and dissolution of metastable precipitates in an Al–11.8 at. % Zn alloy (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 578-580 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An Al-11.8 at.% Zn alloy has been studied, under various thermal conditions, with the neutron small-angle scattering apparatus (D11A) at the ILL. The sample was mounted in a furnace, so that alternate in situ growth and dissolution studies of metastable precipitates could be made. The samples were slowly cooled from 300°C to different fixed temperatures in the range from 25 to 200°C, and the decomposition was studied at these growth temperatures for aging times of up to several hours in each case. Subsequently, at the end of each growth experiment, the samples were rapidly heated to 300°C, and the dissolution was followed by taking a data set every 20 s. The scattering intensity in these dissolution experiments was found to decrease rapidly with time. so that in many cases the whole process was largely completed within a few minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013916
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  • 4
    Electronic Resource
    Electronic Resource
    Oxygen precipitation in heavily boron-doped silicon (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 576-580 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Small-angle neutron scattering is used to study the precipitation behaviour of dissolved oxygen in dislocation-free Czochralski-grown single crystals of silicon doped with boron and compared with those for similar undoped material. The presence of boron dramatically alters the nature of precipitates in silicon. Heat treatment at 1023 K no longer leads to the formation of the large cushion-shaped precipitates observed in essentially undoped material. The precipitates are much smaller, and do not exhibit any anisotropic small-angle scattering. Furthermore, the precipitation process is over in less than 24 h. Subsequent treatment at 1323 K leads to the formation of cushion-shaped regions which are much larger than those formed in the absence of boron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889890013164
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of precipitation using small-angle neutron scattering (SANS) (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 870-872 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Some earlier results are summarized which demonstrate the range of applications of SANS in the study of inhomogeneities. The size, number density, chemical composition (Ni3Al0.6Ti0.4) and kinetics of the γ′ precipitates in a Nimonic superalloy have been determined by SANS. The formation and growth of voids on the grain boundaries of a Nimonic superalloy have been followed by in situ SANS. The crystallographically aligned θ′ precipitates in an Al–Cu crystal exhibit anisotropic SANS from which the edge lengths of the θ′ platelets have been determined. Finally, SANS was used to study a very dilute concentration (20 p.p.m.) of the second phase particles in a silicon crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889888004418
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of inhomogeneity size and concentration on the analysis of small-angle scattering data (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 349-351 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The random distribution model is commonly used for estimating the concentration of inhomogeneities in a solid from small-angle scattering data. This paper investigates the effect of the size and the separation of the inhomogeneities on the peak in the scattering curve. A relationship linking the mean separation to the position of the scattering peak and the size of the inhomogeneities is established. This in turn provides a simple method of estimating the volume fraction of inhomogeneities from small-angle scattering data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889891002480
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