Influence of scandium on an Al–2% Si alloy processed by high-pressure torsion

Rajinikanth, V and Venkateswarlu, K and Sen, Mani Kuntal and Das, Mousumi and Alhajeri, S N and Langdon, T G (2011) Influence of scandium on an Al–2% Si alloy processed by high-pressure torsion. Materials Science and Engineering A, 528 (3). pp. 1702-1706.

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Abstract

High-pressure torsion (HPT) was used to process Al–2% Si and Al–2% Si–0.25% Sc alloys for up to five turns and the mechanical properties of the processed materials were evaluated using the ball indentation technique (BIT). The results show that the presence of Al3Sc precipitates is effective in producing higher strength levels and greater grain refinement in the Al–2% Si–0.25% Sc alloy. The introduction of scandium reduces the grain size of the Al–2% Si alloy from ∼0.38 to ∼0.15 μm after 5 turns of HPT and the corresponding maximum tensile strength is increased from ∼325 to ∼375 MPa. The grain and substructure formation in the Al–2% Si alloy is similar to aluminum with dislocation cell formation and a reasonably recovered microstructure whereas in the Al–2% Si–0.25% Sc alloy it is non-homogeneous with arrays of non-equilibrium boundaries and dislocation tangles within the grains.

Item Type:Article
Official URL/DOI:http://dx.doi.org.scopeesprx.elsevier.com/10.1016/...
Uncontrolled Keywords:Aluminum alloys; Ball indentation technique; High-pressure torsion; Scandium; Severe plastic deformation
Divisions:Material Science and Technology
ID Code:4240
Deposited By:Dr. A K Sahu
Deposited On:05 Nov 2011 14:36
Last Modified:23 Apr 2013 13:17
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