scholarly journals Thermodynamics and kinetics of solids fragmentation at severe plastic deformation

2015 ◽  
Vol 18 (3) ◽  
pp. 33004 ◽  
Author(s):  
Khomenko ◽  
Troshchenko ◽  
Metlov
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of

scholarly journals Modelling of Kinetics of Modes of a Fragmentation of Materials at a Severe Plastic Deformation

2017 ◽  
Vol 39 (2) ◽  
pp. 265-284 ◽  
Author(s):  
O. V. Khomenko ◽  
◽  
D. S. Troshchenko ◽  
L. S. Metlov ◽  
◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Kinetics Of

Effects of severe plastic deformation on transformation kinetics of precipitates in CuNi3Si1Mg

2016 ◽  
Vol 676 ◽  
pp. 156-164 ◽  
Author(s):  
M. Gholami ◽  
I. Altenberger ◽  
J. Vesely ◽  
H.-A. Kuhn ◽  
M. Wollmann ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Transformation Kinetics ◽  
Kinetics Of

scholarly journals Self-Similar Mode of Metals Fragmentation under Severe Plastic Deformation

2019 ◽  
Vol 64 (6) ◽  
pp. 487
Author(s):  
A. V. Khomenko
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Structure ◽  
Structural Defects ◽  
Boundary Density ◽  
Similar Mode ◽  
Self Similar ◽  
Metallic Specimen ◽  
Comparison Of The Results ◽  
Kinetics Of

In the framework of nonequilibrium evolution thermodynamics, the influence of additive fluctuations on the kinetics of structural defects under severe plastic deformation has been studied. The applied method is a new one for the description of fragmentation modes and corresponding self-organization processes. It is found that a fragmented metallic specimen demonstrates a self-similar behavior, which results in the formation of a grain structure with various grain sizes. Such a behavior takes place provided that the probability distribution for the grain boundary density has a power-law dependence. A comparison of the results obtained in the Itˆo and Stratonovich forms demonstrates the absence of qualitative changes in the behavior of the system.

Oxygen Isotope Exchange between Gaseous Phase Enriched with 18O Isotope and Nanocrystal Oxides LaMnO3+δ Obtained by Severe Plastic Deformation

2008 ◽  
Vol 273-276 ◽  
pp. 233-238 ◽  
Author(s):  
Boris A. Gizhevskii ◽  
Anatoly Yakovlevich Fishman ◽  
E.A. Kozlov ◽  
Tatiana Eugenievna Kurennykh ◽  
S.A. Petrova ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Isotope Exchange ◽  
Gaseous Oxygen ◽  
Oxygen Isotope Exchange ◽  
Self Diffusion ◽  
Isotope Concentration ◽  
18O Isotope ◽  
O Isotope ◽  
Kinetics Of

The kinetics of the isotope exchange between gaseous oxygen enriched with the 18O isotope and two LaMnO3+δ oxide samples – a nanopowder and a bulk nanocrystal – has been studied. The 18O isotope concentration has been measured by the acceleration nuclear microanalysis method. The coefficients of the volume and the nanograin boundary self-diffusion of oxygen have been evaluated at 500 °C. They are equal to 3.5·10 −20 and 1.5·10 −13 cm2/s, respectively.

Microstructure Evolution and Aging Kinetics of Al-Mg-Si and Al-Mg-Si-Sc Alloys Processed by ECAP

2006 ◽  
Vol 503-504 ◽  
pp. 493-498 ◽  
Author(s):  
Giuliano Angella ◽  
Paola Bassani ◽  
Ausonio Tuissi ◽  
D. Ripamonti ◽  
Maurizio Vedani
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Structure ◽  
Structure Evolution ◽  
Precipitation Kinetics ◽  
Structure Development ◽  
Ultrafine Structure ◽  
Aging Sequence ◽  
Aging Kinetics ◽  
Kinetics Of

A study was carried out on a ECAP processed Sc-containing Al-Mg-Si alloy and on a reference 6082 alloy to investigated grain structure evolution during severe plastic deformation and post-ECAP aging behaviour. The results showed that the mechanism of ultrafine structure development was substantially unchanged with respect to a reference Sc-free alloy. Also the aging sequence and precipitation kinetics of the two alloys revealed to be comparable. The ECAP processed samples of the 6082 reference alloy showed a clear recrystallization peak at temperatures in the range 315-360°C, depending on the amount of strain experienced, whereas the Sc-containing alloy retained its ultrafine structure up to temperatures well exceeding 450°C, under the conditions reproduced in a DSC temperature scan.

Effects of Severe Plastic Deformation: Mechanical Properties and Beyond

2006 ◽  
Vol 503-504 ◽  
pp. 91-98 ◽  
Author(s):  
Yuri Estrin
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Case Studies ◽  
Mg Alloys ◽  
Beneficial Effects ◽  
Kinetics Of

In this talk, a range of effects produced by severe plastic deformation will be considered. In addition to the mechanical property improvements, such as enhanced strength and more favourable conditions for superplasticity, SPD will be shown to produce a much broader spectrum of beneficial effects. Case studies demonstrating accelerated kinetics of nitriding of steels and hydrogenation of Mg alloys will be presented. Further possible applications of SPD techniques will be discussed.

scholarly journals Critical Redistribution of Nitrogen in the Austenitic Cr-Mn Steel under Severe Plastic Deformation

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7116
Author(s):  
Valery Shabashov ◽  
Kirill Lyashkov ◽  
Kirill Kozlov ◽  
Vladimir Zavalishin ◽  
Andrey Zamatovskii ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Structural Phase ◽  
Cold Deformation ◽  
Mechanical Tests ◽  
Abnormal Behavior ◽  
Manganese Steel ◽  
Nitrogen Redistribution ◽  
Mn Steel ◽  
Kinetics Of

A narrow temperature range of changes in the mechanism and kinetics of structural-phase transformations during mechanical alloying under deformation in rotating Bridgman anvils was determined by the methods of Mössbauer spectroscopy, electron microscopy, and mechanical tests in the high-nitrogen chromium-manganese steel FeMn22Cr18N0.83. The experimentally established temperature region is characterized by a change in the direction of nitrogen redistribution—from an increase in the N content in the metal matrix during cold deformation to a decrease with an increase in the temperature and degree of severe plastic deformation. The change in the direction of nitrogen redistribution is due to the acceleration of the decomposition of a nitrogen-supersaturated solid solution of austenite with the formation of secondary nanocrystalline nitrides. The presence of a transition region for the mechanism of structural-phase transitions is manifested in the abnormal behavior of the mechanical properties of steel.

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