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This study was conducted to investigate the effects of titaniumfineparticle bombarding (TiFPB) treatment on fatigue strength of frictionstirwelded aluminum alloy (FSW material) and on its mechanical properties in salt water environment. Fatigue cracks of TiFPBed FSW material were initiated from the root of the overhung weld toes formed by the passing of the tool, as well as those of FSW material. TiFPB treatment introduced compressive residuals stress to the surface of FSW material, although its absolute value was relatively low near the weld toes. As a result, fatigue strength of FSW material was recovered by TiFPB treatment to the same level of the substrate. TiFPB treatment diffused titanium to the surface of FSW material. Diffusion of titanium was insufficient near the weld toes because of disturbance by the overhung weld toes. Such insufficient diffusion of titanium induced electrolytic corrosion. As a result, tensile strength of FSW material in salt water environment deteriorated with TiFPB treatment. [doi:10.2320/jinstmet.J2014002]

Effects of Ti-FPB Treatment on Fatigue Strength of FSWed Aluminum Alloy and on Its Mechanical Properties in Salt Water Environment