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  • 1
    Electronic Resource
    Electronic Resource
    Structural comparison of amorphous Cu50Zr50 alloys prepared by proton irradiation, melt spinning, and mechanical alloying (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4772-4774 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray diffraction was used to evaluate the structures of amorphous samples of Cu50Zr50 prepared by three different methods, namely, melt spinning, mechanical alloying, and irradiation by 2-MeV protons. The results demonstrate conclusively for the first time that, within experimental error, the short-range atomic distribution in an amorphous alloy is the same, regardless of how it is prepared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341196
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  • 2
    Electronic Resource
    Electronic Resource
    Long-range order in Cu3Au and dilute Cu3Au–Co alloys (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 10 (1977), S. 468-472 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The long-range order parameter, S, of pure Cu3Au and two Cu3Au alloys containing 0.64 and 1.5 at. % Co was determined over the temperature range 325 to 387°C. In principle, the state of order in the ternary alloy (Cu3Au)1−XCoX is described by two order parameters S1 = Aα − Aβ, and S2 = Bβ − Bα where Aα is the fraction of α sites occupied by A atoms, etc. It is shown that S2 − S1 = Cα − Cβ = 0 as long as the Co atoms are randomly distributed on α and β sites. The values of S were measured at temperature using Warren's method [Warren, B. E. (1969). X-Ray Diffraction. Reading, Mass.: Addison-Wesley] applied to powder samples, employing the {110}, {210}, {211}, and {221, 300} superstructure and the {111}, {200}, {220}, {311}, and {222} fundamental reflections. The results on pure Cu3Au are in relatively good agreement with earlier measurements, but in poor agreement with theoretical predictions, especially at temperatures above 360°C. Within the accuracy of the measurements, it is observed that cobalt, which is in solid solution in both alloys, has no effect on the experimentally determined values of S. The root-mean-square vibration amplitudes, 〈u2〉1/2, of the Cu and Au atoms at 640°K were also estimated from the data, and it appeared that 〈u2〉1/2Cu decreased slightly with increasing Co content while 〈u2〉1/2Au increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889877013983
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  • 3
    Electronic Resource
    Electronic Resource
    Fracture toughness of ceramics and semi-brittle alloys using a miniaturized disk-bend test (2000)
    Springer
    Materials research innovations 3 (2000), S. 250-262 
    Details
    ISSN: 1433-075X
    Keywords: Key words Small-specimen testing ; Controlled-flaw method ; Fracture toughness ; Brittle materials ; Finite element analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: ∞ is the crack resistance at ”infinite” crack length. It is convincingly shown that this so-called R-curve equation correctly predicts K∞, which is comparable to the conventionally measured Mode I plain-strain fracture toughness, KIc, of the same material. The fundamental constants in the fracture-mechanics-based equations are discussed, emphasizing the aspects pertinent to the small specimens used in the MDBT. Results are presented on 8 materials: ZnS, glass-ceramic, Si3N4, Ti5Si3, SiC, Ni3Ge, NiAl and Ti-46.5A1-2.1Cr-3.0Nb-0.2W. All are brittle except for the latter two, which undergo slight plastic deformation before fracturing. The resulting values of K∞ are in excellent agreement with published values derived from conventional measurements, providing considerable confidence in the method. where Q is a constant and K∞ is the crack resistance at ”infinite” crack length. It is convincingly shown that this so-called R-curve equation correctly predicts K∞, which is comparable to the conventionally measured Mode I plain-strain fracture toughness, KIc, of the same material. The fundamental constants in the fracture-mechanics-based equations are discussed, emphasizing the aspects pertinent to the small specimens used in the MDBT. Results are presented on 8 materials: ZnS, glass-ceramic, Si3N4, Ti5Si3, SiC, Ni3Ge, NiAl and Ti-46.5A1-2.1Cr-3.0Nb-0.2W. All are brittle except for the latter two, which undergo slight plastic deformation before fracturing. The resulting values of K∞ are in excellent agreement with published values derived from conventional measurements, providing considerable confidence in the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010875
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  • 4
    Electronic Resource
    Electronic Resource
    Precipitation and irradiation damage in proton-irradiated palladium-chromium alloys (1988)
    Springer
    Journal of materials science 23 (1988), S. 1206-1218 
    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 Irradiation damage of Pd-Cr alloys containing 15, 20 and 25 at % Cr was studied over the temperature range 100 to 550° C, primarily in samples irradiated to a dose of 0.7 d.p.a. The solubility limit in this range of temperatures varies from 22 to 38% Cr, and precipitation of a phase having the L12 crystal structure was observed in unirradiated samples of the 25% Cr alloy aged at temperatures as low as 100° C. Octahedrally shaped voids, with faces parallel to {1 1 1}, were found only in the 25% Cr alloy irradiated from 350 to 550° C, but not in the other alloys at any temperature. The undersized chromium atoms migrate to point-defect sinks during irradiation, resulting in solute segregation and, eventually, precipitation under certain conditions. The precipitation of the L12 phase, which is the thermodynamically stable phase at higher chromium contents, was irradiation-induced at dislocation loops, voids and grain boundaries in the more concentrated undersaturated alloys. This irradiation-induced precipitation was observed in the mid-range and surface regions of the samples containing 20 and 25% Cr, but not in those containing 15% Cr. The behaviour of these alloys is compared with Pd-Fe and Ni-Si alloys, which have also been proton-irradiated in this laboratory, and the similarities and differences are noted and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154580
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  • 5
    Electronic Resource
    Electronic Resource
    A small-specimen investigation of the fracture toughness of Ti5Si3 (1995)
    Springer
    Journal of materials science 30 (1995), S. 5479-5483 
    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 The fracture toughness of the refractory hardmetal Ti5Si3, with a grain size between 5 and 6 μm, was measured using the controlled-flaw method in conjunction with the miniaturized disc-bend test. The specimens used in these experiments were 3 mm diameter and varied in thickness from 150–450 μm. They were indented using a Vickers pyramid indentor to indention loads varying from 2.9–79.2 N. Indentation cracking was experienced at all indentation loads, and R-curve behaviour was exhibited. The fracture toughness was determined to be 2.69 ± 0.21 MPam1/2 using a straightforward graphical procedure involving an empirical R-curve equation. This value is almost 30% higher than that of similar material (2.1 MPam1/2) with a larger grain size, suggesting that the fracture toughness of this material, which fractures intergranularly, might be grain-size dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351561
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