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  • 1
    Electronic Resource
    Electronic Resource
    Age-hardening reactions and microstructures of a dental gold alloy with palladium and platinum (1990)
    Springer
    Journal of materials science 1 (1990), S. 49-54 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The age-hardening reactions and microstructures of a dental casting gold alloy with some palladium and platinum were investigated by means of hardness tests, X-ray diffractometry, electrical resistivity measurements, and scanning and transmission electron microscopy. Ageing reactions during isothermal annealing were completed by two stages. The first stage corresponded to the formation of a metastable CuAu I phase within grains, and the second stage to a cellular reaction at grain boundaries. The former contributed to the hardening and the latter to the softening. An activation energy of 128 kJ mol−1 for hardening was obtained. Two types of cell growth were observed and could be distinguished in terms of the homologous temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705354
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phase transformation behaviour of a low carat gold alloy for porcelain bonding during continuous heating (1992)
    Springer
    Journal of materials science 3 (1992), S. 54-58 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The phase transformation associated with hardening in a low carat gold alloy for porcelain bonding during continuous heating was studied by resistivity measurements, hardness tests, X-ray diffraction and scanning and transmission electron microscopies. A short-range order structure, based on Au-Pd, was produced at a lower temperature. At an elevated temperature, two types of precipitation were observed. One is a nodular reaction consisting of an L12 ordered structure based on Pd3Sn and a disordered FCC structure at grain boundary. The other is a formation of spherical L12 ordered precipitates based on Pd3Sn within the grain followed by Ostwald ripening. A fine dispersed precipitate of the latter contributed to the remarkable hardening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702945
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ageing reactions in a high carat gold alloy for dental porcelain bonding (1997)
    Springer
    Journal of materials science 8 (1997), S. 277-282 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The phase transformation during continuous heating of a high carat gold alloy used for porcelain bonding was investigated by electrical resistivity measurements, hardness tests, X-ray diffraction and scanning and transmission electron microscopy. Four reaction stages (I, II, III and IV) were found. Stage I corresponded to the formation of a short-range order. A discontinuous precipitation took place in stage II, which contributed to remarkable hardening. Stages III and IV were reactions to the stable phases at each temperature region, and resulted in softening. The activation energies for stages I, II and III are 27.1, 33.8 and 58.2 kcal/mol, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018556110936
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fractal dimension of grain boundary in CuAu alloys refined by platinum addition (1998)
    Springer
    Journal of materials science 33 (1998), S. 4783-4785 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Irregularity of the grain boundaries in CuAu alloys refined by platinum addition was estimated by fractal analysis. The fractal dimension increased with decreasing the grain size, which introduced by platinum addition. The grain refinement produced more complexity in microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004409725726
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  • 5
    Electronic Resource
    Electronic Resource
    Ageing behaviour in a dental low-gold alloy with high copper content (1998)
    Springer
    Journal of materials science 9 (1998), S. 213-219 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Phase transformation behaviour in a dental low-gold alloy with high copper content during continuous heating was investigated by hardness tests, electrical resistivity measurements, X-ray diffraction, scanning and transmission electron microscopies. Two kinds of solution treatment conditions (at 873 K and 1073 K) followed by iced-brine quench, represented different ageing behaviours. Although subsequent anisothermal annealing produced same phase separation of face-centred cubic disordered and ordered (Cu3Au) phases in both specimens, the specimen quenched from 1073 K had already been hardened by a spinodal decomposition. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008888124024
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    Paper (German National Licenses)
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