Home Kovove Materialy-Metallic Materials 2011 Metallic Materials Vol. 49 (2011), no. 3, pp.207-212

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Metallic Materials Vol. 49 (2011), no. 3, pp.207-212

Title: The skin effect in a high pressure die cast Mg-RE alloy
Author: YANG, K. V., CACERES, C. H., EASTON, M. A., GIBSON, M. A.

Abstract: Cross-sectional microhardness maps of high pressure die cast-to-shape specimens of a Mg-3.44 mass% La alloy with either a rectangular or circular cross-section were produced. Higher microhardness numbers identified a harder layer, or “skin”, near the casting surface in both cross-sectional shapes. The higher hardness values were ascribed to the finer solidification microstructure and higher volume fraction of eutectic in the skin. The lower hardness values observed at the centre, or “core”, of the cross-section were ascribed to the larger average grain size resulting from the aggregation of externally solidified grains and dispersed microporosity. The skin was non uniform in both depth and hardness due to local homogeneities of the microstructure caused by the scattered presence of large externally solidified grains near the surface, for both geometries, but especially for the rectangular one. The relationship between the symmetry of the die filling and solidification patterns and the shape of the die cross-section appears to determine both the global and local features of the skin.

Keywords: magnesium-RE alloys, grain microstructure, high pressure die casting, skin effect microhardness mapping
Year: 2011, Volume: 49, Issue: 3 Page From: 207, Page To: 212

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