Abstract
High-purity polycrystalline nickel (99.99 pct purity) was cold rolled to equivalent von Mises strains from 1.4 to 4.5 (70 to 98 pct reduction in thickness). The stored energy of the deformed samples was measured using both microstructural parameters obtained from transmission electron microscope (TEM) investigations and differential scanning calorimetry (DSC). For the microstructure-based estimate of the stored energy, the required parameters are the misorientation angles across, and the spacings between the dislocation boundaries and high-angle boundaries present after deformation. It was found that the stored energy determined from both TEM and DSC investigations increased linearly with strain, with the latter being larger by a factor of between 1.9 and 2.7. This difference can be reduced by considering the contribution to the stored energy from other sources.
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Notes
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
In the NETZSCH evaluation, the recrystallization peak was also used to characterize the stored energy in copper.
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Acknowledgments
Two of the authors (TK and NH) gratefully acknowledge the Danish National Research Foundation for supporting the Center for Fundamental Research: Metal Structures in Four Dimensions, within which this work was performed. Two other authors (AG and QL) acknowledge the National Natural Science Foundation of China for financial support under Contract Nos. 50571049 and 50571051. The authors are also grateful to Dr Wolfgang Pantleon for his help in full discussions and for proposing the use of Eq. [11].
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Knudsen, T., Cao, W., Godfrey, A. et al. Stored Energy in Nickel Cold Rolled to Large Strains, Measured by Calorimetry and Evaluated from the Microstructure. Metall Mater Trans A 39, 430–440 (2008). https://doi.org/10.1007/s11661-007-9421-1
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DOI: https://doi.org/10.1007/s11661-007-9421-1