The Influence of Dislocation Junctions on Accumulation of Dislocations in Strained FCC – Single Crystals

Abstract:

Dislocation junctions, formed as a result of dislocation reactions, affect the plastic strain process, at least, for two reasons. First of all, junctions serve as barriers to shear-forming dislocations and restrict their path, therefore, the size of the shear zone. Sizes of the shear zone are determined by the density of reacting dislocations in non-coplanar slip systems, forming long enough barriers in the form of dislocation junctions. Secondly, non-breaking dislocation junctions are accumulated inside the shear zone, which leads to an increase in the intensity of the dislocation density accumulation.The present work is devoted to the study of the influence of dislocation junctions on accumulation of the density of dislocation debris (debris junctions) due to formation of stable junctions. For this purpose, the probability density function of lengths in non-breaking junctions is calculated. The model of dislocation interactions, built by the authors of the paper for FCC single crystals, is used.

• Periodical: Advanced Materials Research (Volume 1013)
• Pages: 272-279
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1013.272
• Online since: October 2014
• Authors: Vladimir Starenchenko*, Dmitrii Cherepanov, Raisa Kurinnaya, Marina Zgolich, Olga Selivanikova
• Keywords: Dislocation Debris, Dislocation Density, Dislocation Junctions, Dislocation Reactions, Metals, Plastic Strain, Shear Zone, Single Crystal

References

[1] J.J. Gilman, On the Debris Mechanism of Strain-hardening, J. of Applied Physics. 33 (1962) 2703-2709.

DOI: 10.1063/1.1702535

[2] R.I. Kurinnaya, M.V. Zgolich, V.A. Starenchenko, Calculation of lengths of dislocation combinations in FCC crystals, Russian Physics Journal. 47 7 (2004) 19-25.

DOI: 10.1023/b:rupj.0000049743.77390.fb

[3] V.A. Starenchenko, M.V. Zgolich, R.I. Kurinnaya, Formation of extended compound dislocations and barriers in the course of interdislocation reactions in FCC crystals, Russian Physics Journal. 52 3 (2009) 25-30.

DOI: 10.1007/s11182-009-9225-4

[4] M.V. Zgolich, R.I. Kurinnaya, V.A. Starenchenko, The influence of applied stress on the length of the dislocation junction formed at interaction of reacting dislocations in FCC–crystals, Bulletin of Tambov University. Ser. Natural and Technological Sciences. 18 4 2 (2013) 1554-1555.

DOI: 10.1063/1.4937837

[5] V.A. Starenchenko, O.D. Pantiukhova, D.N. Cherepanov, Yu.V. Solovieva, S.V. Starenchenko, M.I. Slobodskoy, Plastic strain models in materials with a FCC structure, Publishing NTL, Tomsk, 2011.

[6] E. Göttler, Versetzungsstruktur und Verfestigung von [100]-Kupfereinkristallen, I. Versetzungsanordnung und Zellstruktur zugverformter Kristalle, Phys. Stat. Sol. 28 (1973) 1057-1076.

DOI: 10.1080/14786437308220968

[7] E.V. Kozlov, N.A. Koneva, N.A. Popova, Grain structure, geometrically necessary dislocations and second-phase particles in polycrystals of micro- and meso-levels, Phys. Mesomechanics. 12 4 (2009) 93-106.

DOI: 10.1016/j.physme.2009.12.010