Fatigue Strength Improvement of Environment-Harmonization-Type Aluminum Alloy by FPB Surface Modification(Fatigue 3)

Abstract

To improve the fatigue reliability for aluminum alloy (A6061) by the Fine Particle Bomberding (FPB) surface modification, the influence of the modification on fracture mechanism was studied experimentally. By FPB surface modification, the fatigue strength of A6061 was improved, and the fatigue limit of the surface modified material could be increased by 20%. The detailed observations have revealed that fatigue crack growth in a surface modified specimen showed a tensile mode not a shear mode with virgin material. The fatigue crack initiation and propagation of the surface modified specimen was restricted by the hardening and compressive residual stress.