Morphological features of structures obtained by two-stage crystallization of Al – 7.5 wt. % Si alloy

DOI: https://doi.org/10.15407/foundry-metallurgy-2024.040 

 

А. G. Borisov, wwwrogneda@ukr.net

V. I. Belik

Physico-Technological Institute of Metals and Alloys of the NAS of Ukraine, Kyiv

 

Morphological features of structures obtained by two-stage crystallization of Al – 7.5 wt. % Si alloy were studied. Alloy with composition Al - 7,5wt. % Si; 0,29 wt. %Mg; 0,12 wt. %Fe; 0,028 wt. % Mn; 0,005 wt. %Cu; 0,0015 wt. % Ti.   was used. To control the formation of the structure of the initial alpha phase, thermal, temporal, and force effects on the melt in a thermostat were used. The formation of the structure of the final alpha phase was achieved using various thermal modes of solidification of the casting from a liquid metal suspension in a metal mold.

As a result of the experiments, almost the entire spectrum of morphologies characteristic of semi-solid rheocasting processes of A356 was obtained.

The possibility of controlling the structure of pseudocomposites for A356 alloy by combining the morphologies of the initial and final α-phases has been experimentally demonstrated. The formation of such pseudocomposites is also fundamentally possible for other alloys, which are characterized by the formation of both dendritic and rosette mophologies, for example, alloys based on Al, Cu, Fe, Co, Ni.

Application of various methods of melt treatment at the first stage of crystallization makes it possible to obtain three different types of morphology of the initial alpha phase - dendritic, rosette and globular.

Keywords: Al-based alloys, melt treatment, crystallization, microstructure

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Доповідь Квасницької Ю.Г. на засіданні Президії НАН України

«Вдосконалення матеріалів і технологій для підвищення експлуатаційних характеристик литих лопаток газотурбінних двигунів»

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Захист дисертації PhD

24 липня 2024 року о 10 годині у залі засідань вченої ради  ФТІМС НАН України відбудеться захист дисертації Нурадінова Ібрагіма Абдійовича для здобуття ступеня доктора фіософії.
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Конференція Литво.Металургія-2024

XX Ювілейна Міжнародна науково-практична конференція «Литво. Металургія. 2024», присвячена академіку НАН України В.Л. Найдеку та Нарада-конференція «Промисловість України. Ливарне виробництво, як основна складова для відродження промислового комплексу»

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