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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)378-391
Number of pages14
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume34
Issue number2
DOIs
Publication statusPublished - Feb 2024

Keywords

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

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