Microstructure Development in Single and Double-Pass Friction Stir Processing of Aluminium

Devinder Yadav; Ranjit Bauri

doi:10.4028/www.scientific.net/MSF.753.50

Paper Titles

The Industrial Application of Microstructure Modelling: A View out of the Process Window
p.31

Importance of Local Structural Variations on Recrystallization
p.37

Texture and Microstructure Evolution of a Zirconium Alloy During Uniaxial Compression at 500°C
p.42

3D Analysis of Microstructure Changes Occurring during Creep Tests of Ultra-Fine Grained Materials
p.46

Microstructure Development in Single and Double-Pass Friction Stir Processing of Aluminium
p.50

Orientation Dependence of the Substructure Characteristics in a Ni-30%Fe Austenitic Alloy Deformed in Hot Torsion
p.54

Evolution of Heterogeneous Deformation Structure and Recrystallization Texture of Steel
p.58

Microstructure Evolution and Softening Processes in Hot Deformed Austenitic and Duplex Stainless Steels
p.66

Inspection of Adiabatic Shear Bands in High Manganese TRIP Steels
p.72

HomeMaterials Science ForumMaterials Science Forum Vol. 753Microstructure Development in Single and...

Microstructure Development in Single and Double-Pass Friction Stir Processing of Aluminium

Abstract:

Single pass and double-pass friction stir processing was carried out on commercially pure aluminium at a rotation speed of 640 rpm and traverse speed of 150 mm/min and a detailed electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) analysis was carried out to understand the microstructure developed. The grain size was refined substantially after the first pass whereas there was no significant change in the grain size after the second pass. This indicates that the final grain size after friction stir processing does not depend on the starting grain size. The equiaxed fine grains were formed by dynamic recrystallization process as revealed by EBSD analysis. TEM observations showed banded contrast across the grain boundaries indicating grain boundaries to be in equilibrium. Free dislocations observed inside grains after the first pass were well arranged into subgrain boundaries after the second pass. EBSD also revealed some variation in microstructural features such as grain size, texture index, grain orientation spread and grain average misorientation across the surface and also in the cross section of the stir zone both after single and double pass.