Using ball-indentation to evaluate the properties of an unltrafine-grained Al-2% Si Alloy processed by ECAP
Venkateswarlu, K., Das, Gautam, Pramanik, A.K., Xu, Cheng and Langdon, Terence G. (2006) Using ball-indentation to evaluate the properties of an unltrafine-grained Al-2% Si Alloy processed by ECAP. Materials Science and Engineering: A, 427, (1-2), 188-194. (doi:10.1016/j.msea.2006.04.053).
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As-cast Al–Si alloys exhibit excellent mechanical properties but these properties may be further improved through processing by equal-channel angular pressing (ECAP). In this investigation, specimens of a hypo-eutectic Al–2% Si alloy were successfully pressed up to a maximum of four passes at room temperature and the microstructures and mechanical properties were evaluated. The results show that pressing through four passes reduces the grain size from ~40 to ~0.70 μm, reduces the size of the Si particles from ~12.0 to ~1.08 μm and increases the yield stress and the ultimate tensile strength by a factor of ~2 by comparison with the as-cast alloy. The mechanical properties were examined using a ball-indentation technique (BIT). It is suggested that, since BIT provides the capability of obtaining extensive mechanical data using only a very small sample, it is an ideal technique for evaluating the properties of samples processed by ECAP.
|Keywords:||aluminum–silicon alloy, equal channel angular pressing, indentation testing, severe plastic deformation, ultrafine grains|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||26 Jan 2007|
|Last Modified:||27 Mar 2014 18:28|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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