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  • 1990-1994  (9)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Substructure formation in high-strength dispersely strengthened alloys (1991)
    Springer
    Russian physics journal 34 (1991), S. 244-252 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusions Analysis of new experimental laws of plastic flow observed in high-strength alloys with dispersional strengthening (such as the formation of substructure with high crystal-lattice curvature, high-temperature localization of deformation from the earliest stages, with reorientation of the localized-shear zones and the adjacent undeformed structural elements) leads to the conclusion that deformational point defects play an important role in the realization of collective deformational modes in the high-strength state. In conditions of high nonequilibrium concentration, deformational point defects, first, permit the inclusion of quasi-viscous diffusional mechanisms of crystal-lattice reorientation by point-defect drift in the local fields of high inhomogeneous stress and, second, by facilitating dislocational deformation mechanisms, may lead to local weakening of the shear zones, localization of the plastic flow, and stability loss, in particular, as a result of mutually consistent autocatalytic defect multiplication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00894928
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  • 2
    Electronic Resource
    Electronic Resource
    Physics of the plasticity and fracture of high-strength crystals (1992)
    Springer
    Russian physics journal 35 (1992), S. 783-799 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Systematic studies of the mechanism of plastic deformation, strain hardening, and fracture of high-strength single crystals of heterophase alloys based on copper and austenitic stainless steels with nitrogen are reported. It is shown that the attainment of high resistance to the motion of dislocations results in the appearance of new mechanical behavior: strong orientation dependence of the critical shear stresses, a change in the deformation mechanism from slip to twinning, loss of mechanical flow stability at early stages in deformation, and a transition from viscous to brittle fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560052
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of defects on the systematics of internal oxidation in carbide-strengthened molybdenum alloys (1993)
    Springer
    Russian physics journal 36 (1993), S. 490-496 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the kinetics and mechanism of low-temperature internal oxidation in the rolling-deformed molybdenum alloy TSM-4. We find a significant increase in the growth rate of the thickness of the internally oxidized zone above the theoretically predicted parabolic time dependence. We have performed studies to elucidate the reasons for this phenomenon. We show that low-temperature internal oxidation of a substructure-strengthened TSM-4 alloy is an effective way of increasing its high-temperature strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560430
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  • 4
    Electronic Resource
    Electronic Resource
    Grain boundary migration initiated by diffusion (1992)
    Springer
    Russian physics journal 35 (1992), S. 425-443 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A review is presented of work related to two new processes which arise in crystalline materials when impurities diffuse along grain boundaries from the surface of the material: diffusion-initiated grain boundary migration and recrystallization. We analyze the conditions under which DIGM occurs, the kinetics of the process, its driving forces, and also the changes in the grain fine structure and the near-grain regions, as well as the nucleation of new grains on the migrating boundaries, caused by an uncompensated impurity atom flux. We consider the mechanisms for DIGM. It is shown that not one of the mechanisms proposed to describe DIGM is capable of explaining all the experimentally observed properties of grain boundary migration under DIGM conditions. We note that changes in the grain boundary structure caused by the impurity atoms diffusing along it are due to diverse grain-boundary processes, which have important technological implications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558854
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  • 5
    Electronic Resource
    Electronic Resource
    Preface (1994)
    Springer
    Russian physics journal 37 (1994), S. 407-409 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560111
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of the temperature and structural state on the systematic features of plastic deformation in Mo-Re-based alloys (1994)
    Springer
    Russian physics journal 37 (1994), S. 1193-1199 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The salient aspects of the formation of a dislocation structure during plastic deformation of the alloys Mo-47 wt. % Re and Mo-47 wt. % Re-1 vol. % ZrO2 at T=300 K in previously recrystallized and polygonalized structural states have been studied with an electron microscope. The studies revealed the systematic features of rotational modes of plastic deformation in these alloys under conditions of substructural hardening and high-temperature grain-boundary slip. An analysis is made of the effect that the substructure and highly dispersed particles of the oxide phase have on the plastic deformation and mechanical properties of Mo-Re-based alloys at T=300-1500 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569803
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  • 7
    Electronic Resource
    Electronic Resource
    Sequence of structural-phase states during implantation of C+, N+, and Si+ ions into molybdenum (1994)
    Springer
    Russian physics journal 37 (1994), S. 109-114 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The sequence of structural-phase changes in the surface layer of molybdenum during pulsed implantation of N+, C+, and Si+ ions has been studied. At radiation doses ≲5·1016 cm−2 we detected qualitatively similar structural-phase transformations with the formation of highly dispersed secondary-phase particles (nitrides, carbides, and silicides), dislocations, point defects, and clusters of defects. At radiation doses (1–2)·1017 cm−2 implantation of C+ and Si+ ions causes amorphization of the surface layer; nitrogen implantation is accompanied by the formation of continuous layers of the nitride phase on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00559054
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  • 8
    Electronic Resource
    Electronic Resource
    Structural—Phase transformations in metal alloys during high-dose ionic implantation (1994)
    Springer
    Russian physics journal 37 (1994), S. 452-461 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data on phase and structural transitions in the surface layers of metal alloys as a function of the conditions of ionic implantation (ii) are reviewed. It is noted that ionic mixing of surface-absorbed active elements from the implantational gas medium plays an important role in forming the elementary and phase composition of the ion-doped layers. The dependence of these characteristics on the ii conditions is analyzed. The formation of high-energy defect structures and the dispersion of the implanted-layer crystal structure in the strong internal-stress fields generated by the highly nonequilibrium solid solutions and in the course of phase transformation are considered. New possibilities for microstructural modification in ii are identified, with the formation of high-energy defect (including nanocrystalline), heterophase, and other phase—structural states and their combinations in ion-doped layers of metallic alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560115
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  • 9
    Electronic Resource
    Electronic Resource
    Amorphization of metals by ion implantation and ion mixing methods (1994)
    Springer
    Russian physics journal 37 (1994), S. 703-724 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we present a review of the experimentally determined characteristics of solid-phase amorphization of metals and alloys under ion implantation and ion mixing conditions. For the first time we systematically consider the characteristic features and the thermodynamic, structural, and kinetic criteria for amorphization in different metallic systems, and we demonstrate the expediency of the following classification of alloys undergoing amorphization: “metal-metalloid” systems, intermetallics, heterophase alloys, alloys with high positive heat of mixing. We compare solid-phase amorphization under conditions of bombardment by beams of charged particles, thermal mixing of the alloy components, and mechanical alloying. We consider the phase and structural states preceding amorphization and the possibilities for predicting metallic systems which can undergo amorphization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00559864
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