Abstract
Dislocation structures in \( [\overline{1} 12] \) Cu-7 at. pct Al alloy single crystals cyclically deformed at different plastic strain amplitudes were investigated by transmission electron microscope (TEM) and compared with the results of \( [\overline{1} 12] \) Cu single crystals. It is found that the plastic strain amplitude γ pl has an obvious effect on the slip deformation mode, and consequently on the cyclic hardening behavior of \( [\overline{1} 12] \) Cu-7 at. pct Al alloy single crystals with an intermediate stacking fault energy. For instance, a high slip planarity (i.e., only formation of planar-slip bands) contributes to the occurrence of a gentle cyclic hardening with a much lower saturation stress at a low γ pl of 4.5 × 10−4. A mixed planar/wavy-slip mode (e.g., persistent Lüder’s bands/wall-like microstructures) at an intermediate γ pl of 2.2 × 10−3 causes an obvious cyclic hardening up to a comparable saturation stress to that for the \( [\overline{1} 12] \) Cu single crystal. In contrast, the deformation mode is dominated by wavy slip (e.g., ill-defined dislocation cells and walls) at the highest γ pl of 7.2 × 10−3, causing that its cyclic hardening curve is quite similar to that for the \( [\overline{1} 12] \) Cu single crystal; in this case, a slightly higher saturation stress level than that for the Cu single crystal is reached due to the additional solid solution strengthening.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 51071041, 51271054, and 51231002, and the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No. 20110042110017, as well as by the Fundamental Research Funds for the Central Universities of China under Grant Nos. N110105001 and N120505001. Prof. X.W. Li is grateful for this support.
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Li, X.W., Peng, N., Wu, X.M. et al. Plastic-Strain-Amplitude Dependence of Dislocation Structures in Cyclically Deformed 〈112〉-Oriented Cu-7 at. pct Al Alloy Single Crystals. Metall Mater Trans A 45, 3835–3843 (2014). https://doi.org/10.1007/s11661-014-2353-7
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DOI: https://doi.org/10.1007/s11661-014-2353-7