[Kovove materialy - Metallic materials]
    Tue - June 02, 2020 - 00:55 No. of hits : 1110042 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 35 (1997), Issue 3

Influence of growth rate on mechanical properties of modified Al-Si eutectics (in Czech)
vol. 35 (1997), no. 3, pp. 149 - 161

The effect of growth rate on mechanical properties of Al-12.87Si-0.04Sr (wt.%) alloy was studied. This material was directionally solidified by Bridgman method at growth rate in the range from 3 to 1250 µm/s. It was revealed, that the growth rate has a strong effect on the interparticle spacing of silicon particles and hence on mechanical properties, as well. The higher growth rate, the smaller interparticle spacing and the higher values of ultimate tensile strength, yield strength, elongation to fracture, reductions of area, and hardness. The validity of modified Hall-Petch equation was confirmed for relations UTS, Y.S. and hardness versus growth rate and interparticle spacing for growth rate in the range from 3 to 100 µm/s. The strong dependence of yield strength on hardness in the range of the studied growth rate provides a possibility to predict the mechanical properties on the basis of the hardness results. The increase of elongation to fracture with increasing growth rate was proved by the fracture observation.

Key words
growth rate, mechanical properties, Al-based alloy, Bridgman method

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

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