Evolution of Microstructure and Texture in Friction Stir Processed Al-Mg-Mn Alloy

K.S. Suresh; Nilesh Kumar; Rajiv S. Mishra; Satyam Suwas

doi:10.4028/www.scientific.net/MSF.753.247

Paper Titles

Characterization the Softening Behavior of Cold Rolled AlMnFeSi-Alloys during Conditions of Concurrent Precipitation
p.231

Recovery Kinetics in High Purity and Commercial Purity Aluminium Alloys
p.235

Recrystallization of ECAP-Processed AA4343 Aluminium Alloy Containing Large Second Phase Particles
p.239

Formation of a Random Recrystallization Texture in Heavily Cold Rolled and Annealed Al-1%Si Alloy
p.243

Evolution of Microstructure and Texture in Friction Stir Processed Al-Mg-Mn Alloy
p.247

Coupling of Local Texture and Microstructure Evolution during Restoration Processes in Aluminum Deformed to Large Strains
p.251

Effects of Driving Force and Boundary Migration Velocity on Formation of Recrystallization Texture in Cold Rolled Pure Aluminum Sheets
p.257

Microstructural Evolution of AA6082 with Small Aluminides under Hot Torsion and Friction Stir Processing
p.263

Early Stages of Recrystallization in ECAP-Deformed AA1050 Alloy Investigated by SEM Orientation Mapping
p.267

HomeMaterials Science ForumMaterials Science Forum Vol. 753Evolution of Microstructure and Texture in...

Evolution of Microstructure and Texture in Friction Stir Processed Al-Mg-Mn Alloy

Abstract:

Friction stir processing was carried out on the Al-Mg-Mn alloy to achieve ultrafine grained microstructure. The evolution of microstructure and micro-texture was studied in different regions of the deformed sample, namely nugget zone, thermo-mechanically affected zone (TMAZ) and base metal. The average grain sizes of the nugget zone, TMAZ and base metal are 1.5 μm ± 0.5 μm, 15 μm ± 8 μm, and 80μm ± 10 μm, respectively. The TMAZ exhibits excessive deformation banding structure and sub-grain formation. The orientation gradient within the sub-grain is dependent on grain size, orientation, and distance from nugget zone. The microstructure was partitioned based on the grain orientation spread and grain size values to separate the recrystallized fraction from the deformed region in order to understand the micromechanism of grain refinement. The texture of both deformed and recrystallized regions are qualitatively similar in nature. Microstructure and texture analysis suggest that the restoration processes are different in different regions of the processed sample. The transition region between nugget zone and TMAZ exhibits large elongated grains surrounded by fine equiaxed grains of different orientation which indicate the process of discontinuous dynamic recrystallization. Within the nugget zone, similar texture between deformed and recrystallized grain fraction suggests that the restoration mechanism is a continuous process.