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01908nam a2200193Ia 4500 |
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10.3390-cryst12040518 |
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220510s2022 CNT 000 0 und d |
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|a 20734352 (ISSN)
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|a Unveiling the Mechanisms of High-Temperature 1/2[111] Screw Dislocation Glide in Iron–Carbon Alloys
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|b MDPI
|c 2022
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|z View Fulltext in Publisher
|u https://doi.org/10.3390/cryst12040518
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|a We have developed a self-consistent model for predicting the velocity of 1/2[111] screw dislocation in binary iron–carbon alloys gliding by a high-temperature Peierls mechanism. The methodology of modelling includes: (i) Kinetic Monte-Carlo (kMC) simulation of carbon segregation in the dislocation core and determination the total carbon occupancy of the core binding sites; (ii) Determination of kink-pair formation enthalpy of a screw dislocation in iron—carbon alloy; (iii) KMC simulation of carbon drag and determination of maximal dislocation velocity at which the atmosphere of carbon atoms can follow a moving screw dislocation; (iv) Self consistent calculation of the average velocity of screw dislocation in binary iron–carbon alloys gliding by a high-temperature kink-pair mechanism under a constant strain rate. We conduct a quantitative analysis of the conditions of stress and temperature at which screw dislocation glide in iron–carbon alloy is accomplished by a high-temperature kink-pair mechanism. We estimate the dislocation velocity at which the screw dislocation breaks away from the carbon cloud and thermally-activated smooth dislocation propagation is interrupted by sporadic bursts of dislocation activity. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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|a diffusion
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|a dislocations
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|a dynamic strain aging
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|a FeC alloy
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|a Drenchev, L.B.
|e author
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|a Katzarov, I.H.
|e author
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773 |
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|t Crystals
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