Analytical electron microscopy of spray formed and hot extruded Al-18%Si–5%Fe-1.5%Cu alloy

Srivastava, A K and Srivastava, V C and Gloter, A and Ojha, S N (2006) Analytical electron microscopy of spray formed and hot extruded Al-18%Si–5%Fe-1.5%Cu alloy. In: International conference on Spray Forming, September 04-06, 2006, Bremen, Germany.

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A spray atomization and deposition technique has been employed to produce spray – deposits of an Al-18Si-5Fe-1.5Cu (wt.%) alloy. Subsequently the alloy was hot extruded with a reduction ratio of 6:1 and extrusion temperature of 480 °C. The microstructural features of as spray - deposited and extruded alloy has been examined using SEM and TEM techniques and chemical analyses of phases by spectroscopic method. Samples for TEM study were initially prepared by a tripod mechanical polishing followed with an ion beam milling. The microstructure of spray – deposited alloy exhibited the presence of a cellular and plate – like morphology of β-Al 5 SiFe co-existing with δ-Al 4 Si 2 Fe. The formation of β-Al 5 SiFe phase is suggested to arise as a result of phase transformation of δ-Al 4 Si 2 Fe phase during slow cooling rate of the spray – deposit. The hot extrusion of the alloy resulted in fragmentation of both intermetallic phases and Si and revealed the dislocations present inside the Al-grains / grain boundaries along with broken pieces of Si and intermetallics at nano-scale in the matrix. A systematic approach has been persuaded to understand the evolution of microstructure and phase formation during inert gas atomization, spray deposition and hot extrusion of this alloy.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:spray forming, Al-Si alloy, TEM, nanocrystalline phases
Divisions:Metal Extraction and Forming
ID Code:5720
Deposited By:Dr. V.C. Srivastava
Deposited On:05 Jul 2012 13:11
Last Modified:05 Jul 2012 13:11
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