Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy

Yu tong YANG; Shi yao HUANG; Jiang ZHENG; Li YANG; Xiao nong CHENG; Rui kai CHEN; H. A.N. Wei-jian

doi:10.1016/S1003-6326(23)66405-2

Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy

Yu tong YANG, Shi yao HUANG, Jiang ZHENG^*, Li YANG^*, Xiao nong CHENG, Rui kai CHEN, H. A.N. Wei-jian

^*Corresponding author for this work

Department of Chemistry and Materials Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

High-pressure die-casting (HPDC) was used to develop two sizes of Al−7Si−0.2Mg (mass fraction, %) thin-plates with similar composition. Thin-plate castings with varying degrees of porosities and uneven microstructures were obtained and their effects on ductility were investigated. The results showed that the elongations of specimens from different castings and different positions fluctuated greatly (9.7%−17.9%). Elongation dropped sharply when specimens contained large porosities, which could be ascribed to stress concentration due to the reduction of the effective bearing area. However, for samples with small porosities, α-Al(Fe/Mn)Si phase cracked prior to eutectic phase during plastic deformation. The number density of α-Al(Fe/Mn)Si phase played an important role in the fluctuation of elongation, and specimens with higher number density of α-Al(Fe/Mn)Si particles exhibited deteriorated elongations. In addition, the increase in the number density of α-Al(Fe/Mn)Si phase was attributed to local higher cooling rates.

Original language	English
Pages (from-to)	378-391
Number of pages	14
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	34
Issue number	2
DOIs	https://doi.org/10.1016/S1003-6326(23)66405-2
Publication status	Published - Feb 2024

Keywords

Al−7Si−0.2Mg alloy
ductility
high-pressure die-casting
porosity
α-Al(Fe/Mn)Si phase

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10.1016/S1003-6326(23)66405-2

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title = "Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy",

abstract = "High-pressure die-casting (HPDC) was used to develop two sizes of Al−7Si−0.2Mg (mass fraction, %) thin-plates with similar composition. Thin-plate castings with varying degrees of porosities and uneven microstructures were obtained and their effects on ductility were investigated. The results showed that the elongations of specimens from different castings and different positions fluctuated greatly (9.7%−17.9%). Elongation dropped sharply when specimens contained large porosities, which could be ascribed to stress concentration due to the reduction of the effective bearing area. However, for samples with small porosities, α-Al(Fe/Mn)Si phase cracked prior to eutectic phase during plastic deformation. The number density of α-Al(Fe/Mn)Si phase played an important role in the fluctuation of elongation, and specimens with higher number density of α-Al(Fe/Mn)Si particles exhibited deteriorated elongations. In addition, the increase in the number density of α-Al(Fe/Mn)Si phase was attributed to local higher cooling rates.",

keywords = "Al−7Si−0.2Mg alloy, ductility, high-pressure die-casting, porosity, α-Al(Fe/Mn)Si phase",

author = "YANG, {Yu tong} and HUANG, {Shi yao} and Jiang ZHENG and Li YANG and CHENG, {Xiao nong} and CHEN, {Rui kai} and Wei-jian, {H. A.N.}",

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year = "2024",

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doi = "10.1016/S1003-6326(23)66405-2",

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T1 - Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy

AU - YANG, Yu tong

AU - HUANG, Shi yao

AU - ZHENG, Jiang

AU - YANG, Li

AU - CHENG, Xiao nong

AU - CHEN, Rui kai

AU - Wei-jian, H. A.N.

PY - 2024/2

Y1 - 2024/2

N2 - High-pressure die-casting (HPDC) was used to develop two sizes of Al−7Si−0.2Mg (mass fraction, %) thin-plates with similar composition. Thin-plate castings with varying degrees of porosities and uneven microstructures were obtained and their effects on ductility were investigated. The results showed that the elongations of specimens from different castings and different positions fluctuated greatly (9.7%−17.9%). Elongation dropped sharply when specimens contained large porosities, which could be ascribed to stress concentration due to the reduction of the effective bearing area. However, for samples with small porosities, α-Al(Fe/Mn)Si phase cracked prior to eutectic phase during plastic deformation. The number density of α-Al(Fe/Mn)Si phase played an important role in the fluctuation of elongation, and specimens with higher number density of α-Al(Fe/Mn)Si particles exhibited deteriorated elongations. In addition, the increase in the number density of α-Al(Fe/Mn)Si phase was attributed to local higher cooling rates.

AB - High-pressure die-casting (HPDC) was used to develop two sizes of Al−7Si−0.2Mg (mass fraction, %) thin-plates with similar composition. Thin-plate castings with varying degrees of porosities and uneven microstructures were obtained and their effects on ductility were investigated. The results showed that the elongations of specimens from different castings and different positions fluctuated greatly (9.7%−17.9%). Elongation dropped sharply when specimens contained large porosities, which could be ascribed to stress concentration due to the reduction of the effective bearing area. However, for samples with small porosities, α-Al(Fe/Mn)Si phase cracked prior to eutectic phase during plastic deformation. The number density of α-Al(Fe/Mn)Si phase played an important role in the fluctuation of elongation, and specimens with higher number density of α-Al(Fe/Mn)Si particles exhibited deteriorated elongations. In addition, the increase in the number density of α-Al(Fe/Mn)Si phase was attributed to local higher cooling rates.

KW - Al−7Si−0.2Mg alloy

KW - ductility

KW - high-pressure die-casting

KW - porosity

KW - α-Al(Fe/Mn)Si phase

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Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy

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