Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys

In order to investigate the effect of Mg<sub>2</sub>Si formation on the microstructure and properties of an Al−Si alloy, the critical point of a hypereutectic Al−17Si−4Cu−Mg alloy was calculated by Pandat software. The calculation results of the equilibrium phase diagram show that the cr...

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Autores principales:	Jianfei Hao, Baoyi Yu, Jiancong Bian, Bin Chen, Huishu Wu, Weirong Li, Yanfang Li, Runxia Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	phase diagram calculation Mg<sub>2</sub>Si phase microstructure evolution mechanical properties Al−17Si−4Cu−(0.5, 2.5)Mg alloy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/176465bccbb9431ca7b8c79abb78cb8a
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spelling	oai:doaj.org-article:176465bccbb9431ca7b8c79abb78cb8a2021-11-11T18:06:07ZCalculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys10.3390/ma142165371996-1944https://doaj.org/article/176465bccbb9431ca7b8c79abb78cb8a2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6537https://doaj.org/toc/1996-1944In order to investigate the effect of Mg<sub>2</sub>Si formation on the microstructure and properties of an Al−Si alloy, the critical point of a hypereutectic Al−17Si−4Cu−Mg alloy was calculated by Pandat software. The calculation results of the equilibrium phase diagram show that the critical point for Mg<sub>2</sub>Si phase formation for the alloy was obtained when the Mg content was 2.2%. The contents of 0.5 wt.% Mg and 2.5 wt.% Mg were selected as the research object. The content of Mg increased from 0.5 wt.% to 2.5 wt.%, the eutectic Si in the matrix was reduced, and the Chinese character-like Mg<sub>2</sub>Si phase appeared in the microstructure. In the peak ageing state, in addition to θ″ and Q′ phases that were mainly precipitated, there was also needle-like β″ precipitation in the 2.5 wt.% Mg content alloy. Larger precipitates were found in 2.5 wt.% content alloys, mainly due to the promotion of the solid solution having the aggregation and segregation of more solute elements in the matrix. The tensile strength, elongation, and hardness of hypereutectic Al−17Si−4Cu−0.5Mg alloy under peak ageing were 331 MPa, 3.11%, and 152.1 HB, respectively. The tensile strength and the elongation decreased while the hardness increased with the 2.5 wt.% Mg content, which is due to the formation of hard and brittle Mg<sub>2</sub>Si and Al<sub>8</sub>FeMg<sub>3</sub>Si, which has a splitting effect on the matrix.Jianfei HaoBaoyi YuJiancong BianBin ChenHuishu WuWeirong LiYanfang LiRunxia LiMDPI AGarticlephase diagram calculationMg<sub>2</sub>Si phasemicrostructure evolutionmechanical propertiesAl−17Si−4Cu−(0.5, 2.5)Mg alloyTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6537, p 6537 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	phase diagram calculation Mg<sub>2</sub>Si phase microstructure evolution mechanical properties Al−17Si−4Cu−(0.5, 2.5)Mg alloy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	phase diagram calculation Mg<sub>2</sub>Si phase microstructure evolution mechanical properties Al−17Si−4Cu−(0.5, 2.5)Mg alloy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Jianfei Hao Baoyi Yu Jiancong Bian Bin Chen Huishu Wu Weirong Li Yanfang Li Runxia Li Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
description	In order to investigate the effect of Mg<sub>2</sub>Si formation on the microstructure and properties of an Al−Si alloy, the critical point of a hypereutectic Al−17Si−4Cu−Mg alloy was calculated by Pandat software. The calculation results of the equilibrium phase diagram show that the critical point for Mg<sub>2</sub>Si phase formation for the alloy was obtained when the Mg content was 2.2%. The contents of 0.5 wt.% Mg and 2.5 wt.% Mg were selected as the research object. The content of Mg increased from 0.5 wt.% to 2.5 wt.%, the eutectic Si in the matrix was reduced, and the Chinese character-like Mg<sub>2</sub>Si phase appeared in the microstructure. In the peak ageing state, in addition to θ″ and Q′ phases that were mainly precipitated, there was also needle-like β″ precipitation in the 2.5 wt.% Mg content alloy. Larger precipitates were found in 2.5 wt.% content alloys, mainly due to the promotion of the solid solution having the aggregation and segregation of more solute elements in the matrix. The tensile strength, elongation, and hardness of hypereutectic Al−17Si−4Cu−0.5Mg alloy under peak ageing were 331 MPa, 3.11%, and 152.1 HB, respectively. The tensile strength and the elongation decreased while the hardness increased with the 2.5 wt.% Mg content, which is due to the formation of hard and brittle Mg<sub>2</sub>Si and Al<sub>8</sub>FeMg<sub>3</sub>Si, which has a splitting effect on the matrix.
format	article
author	Jianfei Hao Baoyi Yu Jiancong Bian Bin Chen Huishu Wu Weirong Li Yanfang Li Runxia Li
author_facet	Jianfei Hao Baoyi Yu Jiancong Bian Bin Chen Huishu Wu Weirong Li Yanfang Li Runxia Li
author_sort	Jianfei Hao
title	Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
title_short	Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
title_full	Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
title_fullStr	Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
title_full_unstemmed	Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys
title_sort	calculation based on the formation of mg<sub>2</sub>si and its effect on the microstructure and properties of al–si alloys
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/176465bccbb9431ca7b8c79abb78cb8a
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Calculation Based on the Formation of Mg<sub>2</sub>Si and Its Effect on the Microstructure and Properties of Al–Si Alloys

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