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Crystallization Behavior and Properties of Hypereutectic Al-Si Alloys with Different Iron Content

Deev V., Prusov E., Prikhodko O., Ri E., Kutsenko A., Smetanyuk S.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 4

101--107

EN

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 2.0 wt.%) 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 β-Al5SiFe phase coexist in the structure of the Al-15% Si alloys at a temperature below 575°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 β-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 β-Al5SiFe phase.

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Effect of MWCNTs content on the characteristics of A356 nanocomposite

Rashad R. M., Awadallah O.M., Wifi A. S.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 58, nr 2

74--80

EN

Purpose: The objective of the present paper is to study the effect of Multiwalled Carbon Nanotubes (MWCNTs) content on the mechanical properties of the A356 hypoeutectic aluminum- silicon based nanocomposite. Design/methodology/approach: The semi-solid route stir casting technique is used for composite processing. MWCNTs and Aluminum powder are premixed by ball milling and green compacted to form small billets. Al-MWCNTs billets are added to the melt and incorporated by vigorous mechanical stirring. The mechanical and metallurgical properties of the produced composite are characterized by, scanning electron microscopy (SEM), optical microscopy, and tensile testing DIN 50125. Findings: MWCNTs are successfully incorporated into the A356 melt up to 1.5 % weight fraction. SEM analysis revealed a uniform dispersion of MWCNTs with good interfacial bonding between the matrix and the MWCNTs. The ultimate tensile strength and elongation of the produced composite are increased by 34% and 250% respectively compared to their corresponding values of monolithic alloy. Research limitations/implications: The research was carried out based on MWCNTs only with a range of percentage additions; it could be extended to single Walled CNTs and graphene sheets with different percentage additions. Stirring time and speed as well as heat treatment can also be applied as further study. Practical implications: This work helps in introducing novel technique in dispersing Nano particulates in metal matrix composites. This could be good potential for new developed composites. Originality/value: A novel approach for MWCNTs reinforcement addition technique is implemented. This technique results in a uniform dispersion of MWCNTs with good interfacial bonding between the matrix and the MWCNTs.

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Badania wytrzymałości na rozciąganie krzepnącego siluminu AlSi21CuNiMgMn

Mutwil J., Romankiewicz R., Zamajski W.

Archiwum Technologii Maszyn i Automatyzacji

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2005

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Vol. 25, nr 1

55-64

PL

W artykule zaprezentowano hydrauliczne stanowisko do badania wytrzymałości na rozciąganie krzepnących i stygnących metali i stopów. Podczas pomiaru jest rejestrowana siła rozciągająca i wydłużenie testowanego odlewu oraz temperatura na przekroju jego ścianki. Opisano badania wytrzymałości na rozciąganie krzepnącego siluminu AlSi21CuNiMgMn. Badano wpływ dodatków stopowych na wytrzymałość krzepnącego stopu. Badaniom poddano stop niemodyfikowany oraz modyfikowany zaprawą AlCul9P.

EN

A hydraulic test stand for examination of tensile strength of solidifying and cooling metals and alloys has been described. The tensile force, extension of test casting and temperatures of its wall are in measurement registered. The examinations of tensile strength of solidifying AlSi21CuNiMgMn alloy have been described. The influence of alloying elements on tensile strength of solidifying alloy has been examined. The examinations have been carried out on unmodified and modified alloy (with AlCul9P master alloy).

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Badania wytrzymałości na rozciąganie krzepnących dwuskładnikowych stopów Al-Si

Mutwil J., Romankiewicz R., Michalski M.

Archiwum Technologii Maszyn i Automatyzacji

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2004

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Vol. 24, nr 1

35-44

PL

W artykule opisano stanowisko do badania wytrzymałości na rozciąganie krzepnących i stygnących metali i stopów. W pomiarze jest rejestrowana silą rozciągająca i wydłużenie testowego odlewu oraz temperatura na przekroju jego ścianki. Przedstawiono wyniki badań dla aluminium i dwuskładnikowych stopów Al-Si.

EN

A stand for examination of tensile strength of solidifying and cooling metals and alloys has been described. The tensile force, extension of test casting and temperatures of his wall are in measurement registered. The examination results for aluminum and aluminium-silicon alloys have been presented.