Thermally activated movement of screw dislocations in polygonized aluminum
DOI:
https://doi.org/10.17533/udea.redin.16319Keywords:
HVTEM, polygonization, creep, dislocations, structure, in situ studyAbstract
In this paper, we study the evolution of polygonized dislocation structures and make an analysis of plastic deformation mechanisms under creep conditions at high temperatures in polygonized aluminum of 99.3% purity. Dislocations play a role of vital importance in the evolution of plastic deformation. The influence of dislocations on the σ – ε curve behavior as well as the shape of this curve have not yet been understood and explained. The absence of such understanding remains a problem nowadays. It is necessary to find and describe an important relationship between dislocation structures studied by means of Transmission Electron Microscopy (TEM) imag es under static conditions, the values for the yield strain, resistance to deformation, and the fracture limit. Concerning this relationship, it is relevant to mention here that the mechanical and thermal stability of defects at the sub-structural hardening drastically determines the stability of the polygonized structure under working conditions. Keeping in mind that polygonized structures are generated as a result of a thermo-mechanical treatment or directly under creep conditions, it is natural to expect that the instabilities of such structures are to be observed under much more stringent temperature and load conditions than those under which these structures were formed.
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References
M. Myshliayev, W. Stepanov, V. Shpeizman. “Change in creep mechanism of BCC metals”. Phys. Status Sol. (a). Vol. 2. 1971. pp. 393-401.
M. Myshliayev, I. Jodos, O. Senkov. “Feature of the dislocation structure of grain boundaries in BCC single crystal”. Scientific magazine titled: (FMM) Fiz. Met. Metalloved. Vol. 48. 1979. pp. 148-151.
V. Rozenberg. “Fundamentals of heat resistance of metal materials”. Scientific magazine. Vol. 1. 1973. pp. 320.
K. Hale, M. Henderson. “Some applications of high voltage electron microscopy to the study of materials”. Micron. Vol. 1. 1970. pp. 434-464.
M. Myshlyaev. “Dislocation Creep”. Annual Review of Materials Research. Vol. 11. 1981. pp. 31-50.
P. Hirsh, A. Howie, R. Nicholson, D. Pashley, W. Whelan. Electron Microscopy of Thin Crystals. 2nd ed. Ed. R. E. Kreiger Publishing Co. Huntington, USA. 1997.
M. Myshliayev, S. Olevskii, S. Maksimov. “Dislocation structure of sub-grain boundaries in creep-deformed aluminum”. Phys. Stat. Sol. (a). Vol. 15. 1973. pp. 391-399.
M. Myshliayev, D. Caillard, J. Martin. “In situ investigation of creep mechanisms of aluminum at intermediate temperatures”. Krist. Und Technik. Vol. 14. 1979. pp. 1325-1328.
J. Hirth, J. Lothe. Theory of Dislocations. 1st ed. Book edited by ATOMIZDAT, Moscow, USSR. 1972. pp. 599.
C. Barrett, W. Nix. “A model for steady state creep based on the motion of jogged screw dislocations”. Acta Met. Vol. 13. 1965. pp. 1247-1258.
W. Nix. “On the jogged screw dislocation model for steady state creep”. Acta. Met. Vol.15. 1967. pp. 1079- 1081.
Y. Chadek. “Creep of Metallic Materials”. 1st ed. Book edited by MIR–11. Moscow, USSR. 1987. pp. 302.
V. Levitin. “The rate steady creep, Calculation and comparison with the experiments on nickel”. Fiz. Met. Metalloved. Vol. 32. 1971. pp. 861-870.
M. Wo, J. San Juan. “Structure and mobility of polygonised dislocation walls in high purity aluminum”. Materials Science and Engineering. Vol. 164. 1993. pp. 153-158.
N. Rykalin. “Calculations of thermal processes in welding”. Mashgiz (in Russian). Vol. 1. 1951. pp. 296.
G. De Wit, J. Koehler. “Interaction of dislocations with an applied stress in anisotropic crystals”. Phys. Rev. Vol. 116. 1959. pp. 1113-1121.
M. Snykers, C. Janssens, “The use of the JEM-1250 High Voltage Electron Microscope (HVTEM) of the University of Antwerp (RUCA) as an instrument for void swelling simulation experiment”. Centre d´etude de L´energie Nucleeaire. Report identified by: BLG521. 1978. pp.17.
H. Schadler. “Mobility of edge dislocations on 110 planes in tungsten single crystals”. Act. Met. Vol. 12. 1964. pp. 861-870.
I. Brodova, I. Shirinkina, T. Yablonskikha, V. Astafeva, E. Shorokhov, I. Zhgilev. “Structure Features of Bulk Sub-Microcrystalline Aluminum Alloys at High Rate Deformation”. Bulletin of the Russian Academy of Sciences: Physics. Vol. 73. 2009. pp. 1257-1261.
I. Brodova, I. Shirinkina, O. Antonova, E. Shorokhov, I. Zhgilev. “Formation of a sub-microcrystalline structure upon dynamic deformation of aluminum alloys”. Materials Science and Engineering-A. Vol. 503. 2009. pp. 103-105.
F. Dudaa, M. Šilhavý. “Dislocation walls in crystals under single slip”. Computer Methods in Applied Mechanics and Engineering. Vol. 193. 2004. pp. 5385- 5409.
H. Zhanga, L. Lia, D. Yuanb, D. Peng, “Hot deformation behavior of the new Al–Mg–Si–Cu aluminum alloy during compression at elevated temperatures”. Materials Characterization. Vol. 58. 2007. pp. 168-173.
H. McQueen, N. Ryan. “Constitutive analysis in hot working”. Materials Science and Engineering: A. Vol. 322. 2002. pp. 43-63.
R.Valiev, R. Islamgaliev, I. Alexandrov. “Bulk nanostructured materials from severe plastic deformation”. Progress in material sciences. No. 45. 2000. pp. 103-189.
T. Lowe, L.Valiev, Z. Kluwer. “Investigations and Applications of Severe Plastic Deformation”. Proceedings of the NATO ARW. Vol. 80. 2000. pp. 394.
S. Limkumnerda, J. Sethna, “Shocks and slip systems: Predictions from a mesoscale theory of continuum dislocation dynamics”. Journal of the Mechanics and Physics of Solids. Vol. 56. 2008. pp. 1450-1459.
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