The skin effect in a high pressure die cast Mg-La alloy

Yang, K. V., Caceres, C. H., Easton, M. A. and Gibson, M. A. (2011) The skin effect in a high pressure die cast Mg-La alloy. Kovove Materialy, 49 3: 207-212. doi:10.4149/km_2011_3_207

Author Yang, K. V.
Caceres, C. H.
Easton, M. A.
Gibson, M. A.
Title The skin effect in a high pressure die cast Mg-La alloy
Journal name Kovove Materialy   Check publisher's open access policy
ISSN 0023-432X
Publication date 2011
Sub-type Article (original research)
DOI 10.4149/km_2011_3_207
Volume 49
Issue 3
Start page 207
End page 212
Total pages 6
Place of publication Bratislava, Slovakia
Publisher Slovenska Akademia Vied * Matematicky Ustav
Collection year 2012
Language cze
Formatted abstract
Cross-sectional microhardness maps of high pressure die cast-to-shape specimens of a Mg- -3.44mass%La alloy with either rectangular or circular cross-section were produced. A harder layer, or "skin", was observed 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 grain microstructure caused by the scattered presence of large externally solidified grains near the surface, for both geometries, but especially for the rectangular one. The global and local features of the skin appear related to the distribution of the externally solidified grains as determined by the solidification pattern characteristic to geometry of the die cross-section.
Keyword Magnesium-RE alloys
Grain microstructure
High pressure die casting
Skin Effect
Microhardness mapping
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2012 Collection
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