Abstract
A new designed surface strengthening method, surface spinning strengthening (3S), was applied to achieve gradient microstructure in the surface layer of a Cu–11 at.%Al alloy. According to the level of grain refinement, the gradient microstructure can be divided into four zones, including nanoscale grain zone, ultra-fine grain zone, fine grain zone and coarse grain zone from the surface to the matrix. Meanwhile, a plenty of grain boundaries and twin boundaries were introduced to inhibit the dislocation motion in the surface layer during the plastic deformation process. Consequently, the hardened layer with a microhardness gradient and high residual compressive stress was produced on the samples, and the yield strength of the Cu–11 at.%Al alloy was effectively improved after 3S processing due to the strengthening effect caused by the gradient microstructure.
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This work was financially supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 51331007 and 51501198.
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Ren, CX., Wang, Q., Zhang, ZJ. et al. A Novel Method for Achieving Gradient Microstructure in a Cu–Al Alloy: Surface Spinning Strengthening (3S). Acta Metall. Sin. (Engl. Lett.) 30, 212–217 (2017). https://doi.org/10.1007/s40195-017-0551-1
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DOI: https://doi.org/10.1007/s40195-017-0551-1