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STATISTICAL DESCRIPTION OF LARGEST PORE SIZE IN MODIFIED AL-SI ALLOYS

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Author(s): Stanislava Fintová | Radomila Konečná | Gianni Nicoletto

Journal: Materials Engineering
ISSN 1335-0803

Volume: 16;
Issue: 3;
Start page: 24;
Date: 2009;
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Keywords: Cast AlSi7Mg alloy | Porosity | Murakami’s statistical method

ABSTRACT
Casting defects in AlSi7Mg alloys are owing to the processing technology inseparable features of final products. The porosity consisting of gas pores or microshrinkages is the most decisive factor influencing the fatigue life of castings. Extreme value statistic method has been shown a suitable procedure for prediction of a size of the largest defects, which can occur in real castings, which are substantially larger than the area of a control specimen prepared for defect distribution analysis. In this contribution application of Murakami’s statistical method based on the description of the largest extreme value distribution to the evaluation of porosity in AlSi7Mg alloy prepared by casting technologies with two types of modifiers, namely Sr and Na is presented. The results of statistical analysis are compared with the fatigue performance of specimens manufactured from particular materials.
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