Heat Treatment Processes of A2024 Rheoforging Alloy and Morphology Investigation by Nanoindentation and Atomic Force Microscopy

D.S. Kim; C.G. Kang; S.M. Lee

doi:10.4028/www.scientific.net/SSP.141-143.385

Paper Titles

Preparation of Large-Diameter Semi-Solid 7075 Aluminum Alloy Billets
p.361

Study of Microstructural Evolution and Phase’s Morphology after Partial Remelting in A356 Alloy
p.367

Fabrication of Metal Matrix Composites under Intensive Shearing
p.373

Viscosity Estimation of Semi-Solid Alloys by Drop Weight Backward Extrusion Test under High Speed Deformation
p.379

Heat Treatment Processes of A2024 Rheoforging Alloy and Morphology Investigation by Nanoindentation and Atomic Force Microscopy
p.385

Comparison of Microstructural Changes in a SIMA Processed A356 Aluminum Alloy after Unidirectional Compression and Rolling: Effect of Pressure Depth
p.391

Study of ECAP Processing Routes on Semi-Solid Microstructure Evolution of A356 Alloy
p.397

Melt Conditioned Direct Chill Casting (MC-DC) of Wrought Al-Alloys
p.403

Rheological Behavior of Semi-Solid Slurry of A356 Alloy at High Shear and Cooling Rates
p.409

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Heat Treatment Processes of A2024 Rheoforging Alloy and Morphology Investigation by Nanoindentation and Atomic Force Microscopy

Abstract:

This study demonstrated nanoindentation techniques of investigating the effects of size and feature in a microstructure on the mechanical properties of rheology-forged aluminum alloy. Mechanical properties and tribological characteristics of rheology-forged Al2024 wrought aluminum alloy in terms of T6 heat treatment were investigated by varying the aging time by nanoindentation and nanoscratch techniques. By nanoindentation/nanoscratch tests and atomic force microscopy, it was demonstrated that the 4 hour aged material exhibites the highest hardness because of the intermediate precipitate phase θ″, which was precipitated by T6 heat treatment at 495°C. Moreover, the friction coefficients in the precipitates in the eutectic phase region were lower than those in the primary α phase region.