Consolidation of High Performance AA6061 and AA6061-SiCp Composite Processed by High Pressure Torsion

W.H. El-Garaihy; El Sayed M.A. Rassoul; Hanadi G. Salem

doi:10.4028/www.scientific.net/MSF.783-786.2623

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Consolidation of High Performance AA6061 and...

Consolidation of High Performance AA6061 and AA6061-SiC_p Composite Processed by High Pressure Torsion

Abstract:

Discs of monolithic AA6061 and AA6061 reinforced with SiC_p were processed via combination of hot compaction of the mixed powders followed by high pressure torsion (HPT). HPT processing was investigated using incremental revolutions up to four, under pressures of 1 and 3 GPa. Structural evolution of the powders before and after HPT processing was investigated using scanning electron microscope (SEM). HPT processing of AA6061 discs produced a trimodel structure with micron-scale grains, subgrains and nanoscale substructure of 29, 1.9 μm, and 250 nm, respectively. Reinforcement with SiC_presulted in a refined structure with micron-scale grains, subgrains and nanoscale substructure of 25, 1.9 μm, and 184 nm respectively. The presence of SiC_p at the triple junctions and along the grain boundaries enhanced the rate of strain hardening of the Al-matrices and significantly refined the grain size. More pronounced refinements of the grains, subgrains, and substructures were observed with increasing the HPT pressure up to 3 GPa.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

2623-2628

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.2623

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Online since:

May 2014

Authors:

W.H. El-Garaihy*, El Sayed M.A. Rassoul, Hanadi G. Salem

Keywords:

AA6061-SiC Composite, High Pressure Torsion, Powder Consolidation, Severe Plastic Deformation

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