Influence of calcium on the microstructure and properties of an Al-7Si-0.3Mg-xFe alloy

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Title:	Influence of calcium on the microstructure and properties of an Al-7Si-0.3Mg-xFe alloy
Authors:	Sreeja Kumari, S S Pillai, R M Nogita, K Dahle, A K Pai, B C
Keywords:	AL-SI alloys Casting alloy Fe Intermetallics Solidification Porosity
Issue Date:	2006
Publisher:	The Minerals, Metals & Materials Society
Citation:	Metallurgical and Materials Transactions A 37(8):2581-2587;Aug 2006
Abstract:	The effect of Ca addition on the microstructure, physical characteristics (density/porosity), and mechanical properties (tensile and impact strength) has been investigated in an Al-7Si-0.3Mg-xFe (x = 0.2, 0.4, and 0.7) alloy. The size of Al-Fe intermetallic platelets (beta-Al5FeSi) increased with increasing Fe content. The addition of Ca modified the eutectic microstructure and also reduced the size of intermetallic Fe-platelets, causing improved elongation and impact strengths. A low level of Ca addition (39 ppm) reduced the porosity of the alloys. The tensile strength was decreased marginally with Ca addition. However, Ca addition improved the ductility of the alloy by 18.3, 16.7, and 44 pet and the impact strength by 44, 48, and 15.8 pct for Fe contents of 0.2, 0.4, and 0.7 pct, respectively.
URI:	http://ir.niist.res.in:8080/jspui/handle/123456789/2162
ISSN:	1073-5623
Appears in Collections:	2006

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