Abstract
Severe plastic deformation led to surface grain refinement when treated using high energy shot-peening (HESP); the average grain size was ∼20–30μm in the top, which was ∼10% of the unpeened ones. The broken Si (Al–Si) particles refined by HESP were important in dislocation multiplication and movement to facilitate the surface modifications. After HESP, residual compressive stress along the hardened layer was induced in the surface of the seam. The highest residual stress along the surface reached ∼200MPa and the maximum along thickness occurred in sub-surface region. Microhardness values decreased as the distance increased through thickness. At peening pressures of 0.3 and 0.4MPa, the average tensile shear strength of the joint remained at 195MPa, which was equivalent to ∼90% that of the base Al alloy. The cracks and pores in the surface were eliminated and a fracture was located in the base Al alloy.
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