Title of article :
On the dynamically stored energy of cold work in pure single crystal and polycrystalline copper Original Research Article
Author/Authors :
D. Rittel ، نويسنده , , A.A. Kidane، نويسنده , , M. Alkhader، نويسنده , , A. Venkert، نويسنده , , P. Landau، نويسنده , , G. Ravichandran، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Pages :
10
From page :
3719
To page :
3728
Abstract :
The thermo-mechanical response of single crystal and polycrystalline high purity copper is systematically compared at low and high strain rates. The mechanical response of each type of material is very different in terms of strain hardening, although both are distinctly strain rate sensitive. A simplified interpretation of the Taylor–Quinney coefficient, in which the strain dependence is not considered, shows a clear (almost linear) increase of this factor with the strain rate, while the two types show distinct trends. This factor increases with the strain rate but remains markedly lower than the classical value of 0.9. The stored energy of cold work is found to be relatively independent of the strain rate, with the polycrystal storing more energy than the single crystal. A microstructural study (transmission electron microscopy) of representative specimens of each type at low and high strain rates reveals a basically similar microstructure, despite dissimilar values of energy storage. It is proposed that a higher level of storage of the energy of cold work by polycrystalline copper is due to the presence of grain boundaries in this group.
Keywords :
Strain rate , Microstructure , copper , Taylor–Quinney coefficient , Stored energy
Journal title :
ACTA Materialia
Serial Year :
2012
Journal title :
ACTA Materialia
Record number :
1146363
Link To Document :
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