Source :
Journal of Materials Processing Tech.
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.
Title of Article :
Effect of high energy shot-peening on the microstructure and mechanical properties of Al5052/Ti6Al4V lap joints
Author/Authors :
Haodong Wang , Xinjian Yuan , Kanglong Wu , Chuan Xu , Yingjun Jiao , Ge Wang , Jun Luo
Author/Authors - جزئيات :
