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

International Conference on Mechanical Engineering, Automation and Control Systems 2016

机械制造;无线电电子学;计算机科学

Martyushev, N.V.^1 ; Bashev, V.S.^1 ; Zykova, A.P.^1

Tomsk Polytechnic University, Lenina ave., 30, Tomsk

634050, Russia^1

关键词: Nano powders;    Si alloys;    Silumins;    Soaking time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/177/1/012118/pdf
DOI  :  10.1088/1757-899X/177/1/012118

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

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, WO3and 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.