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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.
A new designed surface strengthening method, surface rolling strengthening (3S), was applied to achieve gradient microstructure in the surface layer of a Cu-11 at.% Al alloy. Accroding 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. French, a plenty of grain boundaries and twin boundaries were introduced to inhibit the dislocation motion in the surface layer during the plastic deformation process. mediated, 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.