Volume 3, Issue 6, November 2014, Page: 353-362
Plasticity at Absolute Zero as a Fundamental Characteristic of Dislocation Properties
Yuly Milman, Institute for Problems of Materials Sciences, National Academy of Sciences of Ukraine, Kiev, Ukraine
Svitlana Chugunova, Institute for Problems of Materials Sciences, National Academy of Sciences of Ukraine, Kiev, Ukraine
Irina Goncharova, Institute for Problems of Materials Sciences, National Academy of Sciences of Ukraine, Kiev, Ukraine
Received: Oct. 29, 2014;       Accepted: Nov. 11, 2014;       Published: Nov. 20, 2014
DOI: 10.11648/j.ijmsa.20140306.22      View  3103      Downloads  110
Abstract
Values of a plasticity characteristic H for different materials were determined by the indentation method at cryogenic temperatures. Using the linear dependence H(T) at low temperatures, the value of δH at 0 K, designated by δH(0), was obtained by the extrapolation method. Values of δH(0) for different materials, namely FCC, HCP and BCC metals, intermetallics, metallic glasses, quasicrystals, ceramics and covalent crystals, are discussed. An analytic expression for a dependence of δH(0) on the parameters of thermoactivated movement of dislocations, melting point and Young’s modulus E is obtained. It is shown that any type of hardening of a crystal and an increase in the Peierls–Nabarro stress σS(0) reduce δH(0). Only a rise in E leads to the simultaneous increase in σS(0) and δH(0). δH(0) can be considered as a dislocation plasticity in the absence of thermal vibrations of atoms and should be considered together with strength parameters as an important fundamental characteristic of dislocation properties.
Keywords
Hardness, Plasticity, Indentation, Dislocations, Plastic Deformation
To cite this article
Yuly Milman, Svitlana Chugunova, Irina Goncharova, Plasticity at Absolute Zero as a Fundamental Characteristic of Dislocation Properties, International Journal of Materials Science and Applications. Vol. 3, No. 6, 2014, pp. 353-362. doi: 10.11648/j.ijmsa.20140306.22
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