Abstract Severe plastic deformation led to surface grain refinement when treated using high energy shot-peening (HESP); the average grain size was ∼20–30 μm 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 ∼200 MPa 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 0.4 MPa, the average tensile shear strength of the joint remained at 195 MPa, 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.

中文翻译：

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高能喷丸对Al5052/Ti6Al4V搭接接头组织和力学性能的影响

摘要 使用高能喷丸（HESP）处理时，严重的塑性变形导致表面晶粒细化；顶部的平均晶粒尺寸为~20-30 μm，是未喷丸的~10%。通过 HESP 细化的破碎 Si (Al-Si) 颗粒在位错增殖和运动中很重要，以促进表面改性。HESP 后，沿硬化层的残余压应力在接缝表面产生。沿表面的最高残余应力达到~200 MPa，最大沿厚度发生在次表面区域。随着距离的增加，显微硬度值随着厚度的增加而降低。在 0.3 和 0.4 MPa 的喷丸压力下，接头的平均拉伸剪切强度保持在 195 MPa，相当于基础铝合金的约 90%。