Influence of soaking time of modifier in melt on microstructure of Al-12%Si alloys

The influence of the soaking time of the silumin melt with a modifying nanopowder W on the microstructure and the impact toughness of the Al-12%Si silumin is studied in the paper. It was established that when introducing 0.1 mass. % of W and soaking it for 10 min, up to 30% of the inassimilable nano...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2017-03, Vol.177 (1), p.12118
Main Authors: Martyushev, N V, Bashev, V S, Zykova, A P
Format: Article
Language:English
Subjects:
Aluminum
Castings
Crucibles
Impact strength
Microstructure
Silicon base alloys
Silicon wafers
Soaking
Toughness
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Summary:The influence of the soaking time of the silumin melt with a modifying nanopowder W on the microstructure and the impact toughness of the Al-12%Si silumin is studied in the paper. It was established that when introducing 0.1 mass. % of W and soaking it for 10 min, up to 30% of the inassimilable nanopowder W remains in the crucible after pouring. At that, the microstructure of castings is refined, and the impact toughness increases by 12 % compared to the initial alloy. It was established that the powder remaining in the crucible after melting consists of the remnants of metallic W, WO3 and W3O. Nanopowder W is completely assimilated by the melt if the soaking time is increased by 120 min; in this case, the impact toughness reduces, which is connected with the increase of dendrites and silicon wafers sizes.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/177/1/012118