Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.24425/afe.2020.133355
Ключевые слова: hypereutectic aluminium-silicon alloys, iron-rich compounds, intermetallics, crystallization, mechanical properties
Аннотация: Understanding the influence of iron impurity on the formation of the structure and the properties of hypereutectic aluminum-silicon alloys are important for achieving the required quality of castings, especially those obtained from secondary materials. In the present work, the influence of different iron contents (0.3, 1.1, and 2.0Показать полностьюwt.%) on the crystallization process, microstructure and mechanical properties of the Al-15% Si alloy was studied. It is shown that the presence of iron impurity in the Al-15% Si alloy leads to increasing the eutectic crystallization time from 6.2 to 7.6 s at increasing the iron content from 0.3 wt.% to 1.1 wt.%, changing the structure of the alloy eutectic in the solid state. The primary silicon and beta-Al5SiFe phase coexist in the structure of the Al-15% Si alloys at a temperature below 575 degrees C in the range of iron concentrations from 0 to 2 wt.% in equilibrium conditions. In the experimental alloys structure, the primary crystals of the beta-phase were metallographically detected only in the alloys containing 1.1 and 2 wt.% of iron impurity. Increase of the iron content up to 2 wt.% significantly reduces the mechanical properties of the Al-15% Si alloy due to the formation of large platelet-like inclusions of beta-Al5SiFe phase.
Журнал: ARCHIVES OF FOUNDRY ENGINEERING
Выпуск журнала: Vol. 20, Is. 4
Номера страниц: 101-107
ISSN журнала: 18973310
Место издания: WARSZAWA
Издатель: POLSKA AKAD NAUK, POLISH ACAD SCIENCES