Investigation of mechanical properties and grain refinement of al 6082 used in post friction stir processing

Abstract

Friction Stir processing (FSP) has recently become an effective micro structural modification technique. Reported results showed that for different alloys, FSP produces very fine equalizes andhomogenous grain structure. FSP is considered to be a new processing technique and more experimental and analytical investigation are needed to advance the industrial utilization of FSP. Friction stir processing (FSP), is an engineering technology for a solid state technique to fabricate aluminum composites. In present work, FSP is applied to AL 6082/Ti-Ni in order to analyze the effect of Ti-Ni on the microstructure, homogeneity and mechanical properties. newline newlineThe present research work is divided into two parts. In first part, a single pass FSP newline newlinewas carried out at 1800, 1400 and 1120 RPM, with transverse speed of 50, 37.5 and newline newline25 mm/min and an axial force of 10 KN to produce composition. The alloying elements were added to base metal at different volume fraction as 3.75%, 5%, 6.25%, and 7.5%. newline newlineIn the second part, the microstructure was studied using Scanning Electron Microscopy (SEM). Various phases were identified by X-ray diffraction (XRD) the results shows grain size refined, micro hardness increases substantially, effect of alloying element at different fraction on grainsize is also reported. Uniform mixing of the Ti and Ni in AL 6082 is achieved. The micro-hardness is also increased by more than 30% under different rotation speed. newline newline