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  • 1
    Electronic Resource
    Electronic Resource
    Change in the structure of the alloy KhN57kVYu under the action of shock waves generated by the action of powerful nanosecond laser pulses (1990)
    Springer
    Journal of engineering physics and thermophysics 59 (1990), S. 997-1001 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have calculated and experimentally measured the amplitudes of shock waves generated in the monocrystals of the nickel alloy KhN57KVYu under the action of powerful nanosecond laser pulses. We employed an electron-microscope method to study the defect structure formed at various depths of the layers deformed by the shock waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872818
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of crystal structure on dislocation arrays in aging alloys during active deformation (1980)
    Springer
    Metal science and heat treatment 22 (1980), S. 314-318 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. In alloys with moderate amounts of γ′ phase (KhN67MVTYu and KhN60MVTYu) with particle sizes of 350–700 Å the combination of high strength and ductility is due to the mechanism of particles being cut by individual moving superdislocations. The higher yield strength of alloy KhN60MVTYu is due to elastic distortion of the matrix resulting from the difference in the lattice constants of the γ and γ′ phases. 2. Aging of alloy KhN67MVTYu at 800° for 5000 h leads to disruption of the coherent bond between the γ′ phase and the matrix. Deformation occurs mainly by bending of particles by dislocations by the Orowan mechanism and also by cutting by dislocation pile-ups or separate partial dislocations with formation of stacking faults. 3. In alloy KhN60MKVYu with a large volume percentage of γ′ particles the location of γ′ particles in the matrix along crystallographic direction 〈100〉 favors the mechanism of cutting of the particles by superdislocations and is responsible for the combination of high strength and ductility. At the stage of coalescence of the particles with formation of platelets and disruption of the coherent bond with the matrix the free path of dislocation pile-ups and networks is limited by matrix interlayers. This leads to a reduction of both the strength and ductility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693251
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  • 3
    Electronic Resource
    Electronic Resource
    Structure formed by laser heat treatment in heat-resistant nickel alloys and its stability in subsequent aging (1990)
    Springer
    Metal science and heat treatment 32 (1990), S. 517-520 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Laser heat treatment (both with and without fusion of the surface) of KhN59KVMTYu and KhN63KVMTYu heat-resistant aging alloys may change the dispersion of the structure in surface layers up to 1 mm thick and more. 2. In laser heat treatment with fusion of the surface of KhN59KVMTYu alloy eutectic colonies of γ+γ′-phases up to 0.2–0.3 μm in size are formed together with areas of finely dispersed γ′-phase (size 20–40 nm) uniformly distributed in the matrix. To prevent appearance of them it is desirable to conduct laser heat treatment without fusion of the surface. 3. The thermal stability of the surface layers formed in laser heat treatment is higher than after stepped aging. The maximum size of the γ′-phase particles is less and the size distribution of the particles is more uniform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00700324
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  • 4
    Electronic Resource
    Electronic Resource
    Dislocation arrays formed during creep of heat-resistant nickel alloys (1979)
    Springer
    Metal science and heat treatment 21 (1979), S. 855-860 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The second stage of creep in heat-resistant nickel alloys is due to changes in their intercrystalline structure. 2. With the same creep rate during the entire second period, which is characteristic of heat-resistant alloys containing a moderate amount of hardening phase equally distributed in the matrix, deformation is due to the gradual propagation of individual dislocations, leading to crystalline slip. 3. In alloys containing a substantial quantity of hardening phase creating a field of elastic distortion the deformation develops unevenly-the second state of creep has several sections with constant but differing rates of deformation. Each section is characterized by a different mechanism of the interaction of dislocation with growing particles of the hardening phase. 4. The low creep rate in the first section for alloy ÉI661 is due to pinning of dislocations around particles of γ′ phase; accelerated creep in the second section is due to the higher density of mobile dislocations; proparation of dislocations prevents particles of γ′ phase from growing together into platelets in the third stage with a lower creep rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00708353
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  • 5
    Electronic Resource
    Electronic Resource
    Variation in the crystal and dislocation structure of alloy ZhS6KP during cutting (1981)
    Springer
    Metal science and heat treatment 23 (1981), S. 83-88 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Pronounced rebuilding of the crystal structure occurs at a sufficiently great depth during the cutting of heat-resistant alloy ZhS6KP as a result of the simultaneous action of loading and temperature: coalescence or reverse solution of the γ′-phase as a function of the location of the specimen segment relative to the cutting tool. 2. In the contact zone between the cutting tool and component being machined, the γ′-phase particles are structured according to an established rule in the form of quasi-periodic macrolattices; this contributes to the material's increased plasticity. 3. The workability of heat-resistant alloys can be improved by using rational cutting conditions that promote the required rebuilding of the crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01226353
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  • 6
    Electronic Resource
    Electronic Resource
    Laws governing deformation and hardening of single crystals of aging alloys (1977)
    Springer
    Metal science and heat treatment 19 (1977), S. 101-104 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The phenomenon of "early overaging" is not observed in single crystals, i. e., softening of the alloy does not begin until a particle size is reached that is almost an order higher than the "critical" size for polycrystalline material. The phenomenon of early overaging is associated with the structure of the grain boundaries. Softening of single crystals begins when the coherent bond between the particles and the matrix is disrupted. 2. For nickel-base aging alloys hardened with particles of the γ′ type (Ni3Al) one observed an anomalous temperature dependence of the yield strength. The magnitude of the anomaly depends on the properties and the volume percentage of γ′ phase. For alloys with considerable dislocations splitting in the matrix (Ni-Al-Cr alloys, e. g.) the anomalous variation of τc with T at elevated temperatures is combined with a normal variation in the temperature range below room temperature. 3. A means of increasing the ductility of biphase alloys that is new in principle was established—the creation of regular "quasiperiodic macrolattices" from particles of the precipitating phase. The character of the quasiperiodic distribution of particles can be changed by alloying, heat treatment, or application of external loads in the process of aging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703149
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  • 7
    Electronic Resource
    Electronic Resource
    Structure of the surface layer of a hard-metal cold-upsetting tool (1980)
    Springer
    Powder metallurgy and metal ceramics 19 (1980), S. 873-877 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions In the structure of the WC and Co phases making up VK20K hard metal the presence was discovered, in the as-sintered condition, of dislocations and twins, which may be attributed to the generation, during the postsintering cooling of the alloy, of large thermal stresses as a result of the difference in the coefficients of thermal expansion of its tungsten carbide grains and metallic cobalt interlayers. Operation increased the number of dislocations and twins and brought about fragmentation of twins in the Co and WC phases, which is evidence that their wear was preceded by appreciable plastic deformation. In the structure of VK20K alloy in the as-sintered condition and in its surface layer after wear the carbide W2C was found on the surface of the carbide WC between the WC grains and Co-phase interlayers, and it is therefore reasonable to assume the existence under such conditions of an extremely thin transition layer of virtually pure tungsten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00791008
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