Macroscopic and Microscopic Descriptions of the Plastic Deformation of Fcc Metals over a Wide Range [-4pt] of Strain and Temperature
|T. Csanádia, N.Q. Chinhb, J. Gubiczaa and T.G. Langdonb, c
aDepartment of Materials Physics, Eötvös University Budapest H-1117 Budapest, Pázmány P. sétány 1/A., Hungary
bDepartments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA
cMaterials Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, U.K.
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|The plastic behavior of face-centered cubic metals was investigated over a wide range of strain and testing temperature. The experimental stress-strain data were described using both macroscopic and microscopic, well-established relationships. The characteristics of these descriptions are discussed and compared with each other. The analysis of the characteristics leads to a definition of the low and high temperature deformation regions, where the kinetics of both the dislocation-multiplication and the dislocation-annihilation (recovery) are different. For pure aluminum, it is shown that the boundary between these two regions occurs at a homologous temperature of the order of ≈ 0.5 Tm where Tm is the absolute melting temperature. From this analysis, correlations are also drawn between the macroscopic parameters describing the stress-strain relationship and the fundamental characteristics of the microscopic processes both at room temperature and elevated temperatures.|
PACS numbers: 61.66.Bi, 83.50.Uv, 65.40.-b, 81.40.Jj, 61.72.Cc