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


Rajinikanth , V., Venkateswarlu , K., Sen , M.K., Das , M., Alhajeri , S.N. and Langdon , T.G. (2011) Influence of scandium on an Al-2% Si alloy processed by high-pressure torsion. Materials Science & Engineering: A, 528, (3), 1702-1706. (doi:10.1016/j.msea.2010.10.102).

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Description/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 not, vert, similar0.38 to not, vert, similar0.15 μm after 5 turns of HPT and the corresponding maximum tensile strength is increased from not, vert, similar325 to not, vert, similar375 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
ISSNs: 0921-5107
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
Faculty of Engineering and the Environment
ePrint ID: 188523
Date Deposited: 25 May 2011 14:39
Last Modified: 27 Mar 2014 19:42
URI: http://eprints.soton.ac.uk/id/eprint/188523

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