[Kovove materialy - Metallic materials]
    Fri - March 29, 2024 - 11:18 No. of hits : 1736677 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 43 (2005), Issue 4

The effect of structure defects on the fatigue behaviour of AZ91 magnesium alloy prepared by sand casting and squeeze casting
HNILICA, F., OCENASEK, V., STULIKOVA, I., SMOLA, B.
vol. 43 (2005), no. 4, pp. 300 - 316

Abstract
The microstructure, tensile and fatigue properties of the magnesium alloy AZ91 prepared by two different casting methods, i.e. by conventional sand casting and squeeze casting, were studied. In addition, the morphology of fracture surface of fatigue specimens was examined. The mechanisms of crack initiation and growth were studied, too. Correlations between the occurrence of structure defects and the deterioration of alloy properties were looked for. The tensile and fatigue properties of the squeeze-cast samples were found to be better than those of the sand-cast samples. The former samples possess a finer grain structure and, in contrast to the latter, rarely contain tiny pores. The mean fatigue life for 50% probability to failure of the sand-cast alloy is of 3.3 x 105 cycles at maximum stress of 90 MPa and 3.9 x 104 cycles at maximum stress of 100 MPa. The squeeze-cast alloy exhibits fatigue life of 3.3 x 105 cycles at the higher load, i.e. 100 MPa. The number of fatigue cycles to fracture is affected appreciably by structure defects, i.e. by the presence of pores in the sand-cast material and of inclusions, oxide film and phase clusters in the material prepared by squeeze casting.

Key words
magnesium alloy, fatigue properties, structure, sand casting, squeeze casting, fracture morphology, structure defects

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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