[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 18:08 No. of hits : 1736451 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 49 (2011), Issue 3

The skin effect in a high pressure die cast Mg-RE alloy
YANG, K. V., CACERES, C. H., EASTON, M. A., GIBSON, M. A.
vol. 49 (2011), no. 3, pp. 207 - 212

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.

Key words
magnesium-RE alloys, grain microstructure, high pressure die casting, skin effect microhardness mapping

[open article.pdf] Full text (524 KB)

[IMMS SAS]      UMMS SAV - Bratislava (SK) Personal data Protection   ver. 1.8.0      [go to HOME PAGE]
Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2023-10-26 07:45      
Articles in press revised: 2024-03-26 11:42     
Full text pdf uploaded: 2023-11-08 06:53    
Information updated: 2023-04-19 16:14   
Code last revised: 2024-03-06 11:13  

© OldSoft, 2004, …, 2024