Surface Modification and Nanocomposite Layering of Fastener-Hole through Friction-Stir Processing

Abstract

This investigation studied the surface modification and nanocomposite layering of the cylindrical surface of a fastener-hole using friction-stir processing. A tapered tool rotates and transverses a predrilled hole that gradually expands and simultaneously stirs the surface. The stirring modifies the hole's cylindrical surface to help improve the hardness and resist against fatigue loading. Introduction of nanoparticles between the tool and the hole during the friction stirring results in formation of a nanocomposite layer that further improves the fatigue performance. The process development and resulting changes in surface finish, hardness, compressive residual stress near the hole, and fatigue life are presented; the strengthening mechanisms and their relationship with the process parameters are discussed.

Ductilizing of cast hypereutectic Al–17%Si alloy by friction stir processing

“…3,26 The remarkable microstructural changes were noticed in the processed zone due to thermal exposure of material, mixing, and intense plastic deformation. [27][28][29] FSP can locally modify the properties such as refine microstructure, increase the ductility and strength, and reduces casting defects. [30][31][32] The present work deals with the ductilization of the cast alloy via multi-pass FSP route.…”

Friction stir process: a green fabrication technique for surface composites—a review paper

“…In SiC reinforced aluminum surface composite, it was reported that hardness and flexural strength of surface composite improved considerably because of the incorporation of silicon carbide particles [74]. The hardness of the Al7075/B 4 C surface composite was reported that 62% higher that of matrix [75]. It was found that hardness of Al7075/Al 2 O 3 surface composite approximately double whereas impact toughness increases up to 29% [16].…”

A Review on Surface Modification of Aluminium Alloy using Friction Stir Processing

“…The shape of frictionstir process tool play very important role, it consistsof tool shoulder and probe. Vijay and Murugan [40]have been reportedthe impact of different probe shapes (cylindrical, square, and hexagonal) in taper and untapered profile on the tensile strength of FSW Al/TiB2/10. The joint efficiency made by un-tapered square probe obsreved max tensile strength of the base materials comparison to other pin profile.…”