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  • 1965-1969  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Deformation hardening and the temperature dependence of the mechanical properties of ternary ordering alloys. Part II (1967)
    Springer
    Russian physics journal 10 (1967), S. 19-22 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Yield point, hardening factor, and elastic modulus are reported as functions of quenching and test temperatures for the alloys Ni3(Fe + 3 at% Al), Ni3(Fe + 3 at% Mn). A maximum is found in the mechanical properties near the critical temperature Tcr; this does not occur for alloys in the disordered state. The deformation aging under load is examined near this maximum and at 200 ° C. A range of linear hardening occurs up to e of 15–18% in ordered alloys, which is replaced by a range of decreasing hardening coefficient at higher ɛ. The results are discussed by reference to earlier ones for Ni3Fe, Ni3(FeCr). Ni3(FeMo).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00823114
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  • 2
    Electronic Resource
    Electronic Resource
    Change in strain hardening and elastic properties during isothermal ordering of alloys based on Ni3Fe (1968)
    Springer
    Russian physics journal 11 (1968), S. 21-24 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study has been made of the change in the Young's modulus, yield point, hardness, hardening coefficient, slip pattern, and duration of the linear stage in the flow curves during the isothermal ordering of the polycrystalline alloys Ni3Fe, Ni3(Fe + 2% Al), Ni3(Fe + 3% Mn), and Ni3(Fe + 2.5% Cr). A definite relationship has been observed between the changes in these properties at the various stages of ordering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00816207
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  • 3
    Electronic Resource
    Electronic Resource
    Ordering processes and activation energy in Ni3Fe-based ternary alloys (1966)
    Springer
    Russian physics journal 9 (1966), S. 94-99 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of electrical resistance (ϱ) has been used, to study the kinetics of isothermal ordering in the range 200 °–545 ° C in Ni3(FeMn) alloy quenched from 970 ° C, and the kinetics of ordering at 390 ° C in the alloy quenched from various temperatures in the 600 °–800 ° C range. The sections method and the gradient of the ϱ(t) curves were used to find the activation energy for migration and vacancy formation in this alloy on the assumption that the excess vacancies “frozen” in the alloy by quenching at temperatures above Tc are responsible for ordering. The activation energies for vacancy formation and migration were respectively ΔU0 = 33 ± 3 kilocal/mole and ΔUm = 39 ± 4 kilocal/mole, which in total give the activation energy for diffusion Q = 72 ± 7 kilocal/mole in the alloy studied; this approximates to the activation energy for diffusion in pure nickel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00818505
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of dispersion hardening and change in slip mechanism in Cu-Ti and Cu-Ti-Al alloys (1968)
    Springer
    Russian physics journal 11 (1968), S. 103-109 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown in this paper that the hardening of Cu-Ti and Cu-Ti-Al alloys at the coherent-decomposition stage can be described in terms of the basic Mott-Nabarro mechanism. The overaging stage in Cu-Ti alloys is due to the partial loss of coherence of the β-phase, though cutting of the particles by dislocations continues. In Cu-Ti-Al alloys bypassing of the particles in the way suggested by Orowan offers a possible deformation mechanism at the overaging stage. These conclusions are supported by the slip patterns obtained by electron microscopy of replicas. The small difference between the slip patterns of specimens having been quenched and those having been aged to give maximum mechanical properties should be particularly noted, since it is at variance with the data already available, mostly from aluminum alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00817953
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  • 5
    Electronic Resource
    Electronic Resource
    Deformation hardening and temperature dependence of mechanical properties in ternary ordered alloys based on Ni3Fe I (1966)
    Springer
    Russian physics journal 9 (1966), S. 49-55 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variation of hardening factor and resistance to deformation with the quenching and testing temperatures for ordered alloys based on Ni3Fe was investigated. It was shown that the yield point σ0.2 and flow stresses are independent of the quenching temperature right up to about 450 ° C. At higher quenching temperatures there are increases in σ0.2 and in the flow stresses corresponding to small degrees of deformation (ɛ 〈 10%); the highest mechanical properties are found when the quenching temperature is near the Curie point. In quenching from a temperature above the Curie point the mechanical properties and hardening factor fall suddenly to values corresponding to the disordered state of the alloys. The temperature variation of σ0.2 is similar to that mentioned above. The deformation stress at high β values and the hardening factor decrease with increase in testing temperature, and below the Curie point they reach values corresponding to the disordered state. The temperature variation of mechanical properties for specimens in which the formation of long-range order is suppressed by special treatment is characterized by the absence of substantial change near the Curie point. The results obtained are discussed in relation to modern dislocation theories of hardening of alloys with long-range order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00818181
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