Effects of Cu content on microstructure and mechanical properties of Al-14.5Si-0.5Mg alloy

Chih Ting Wu, Sheng Long Lee, Meng Hsiung Hsieh, Jing Chie Lin

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27 Scopus citations

Abstract

This study elucidates how Cu content affects the microstructure and mechanical properties of Al-14.5Si-0.5Mg alloy, by adding 4.65 wt.% and 0.52 wt.% Cu. Different Fe-bearing phases were found in the two alloys. The acicular β-Al5FeSi was found only in the high-Cu alloy. In the low-Cu alloy, Al8Mg3FeSi6 was the Fe-bearing phase. Tensile testing indicated that the low-Cu alloy containing Al8Mg 3FeSi6 had higher UTS and elongation than the high-Cu alloy containing the acicular β-Al5FeSi. It is believed that the presence of the acicular β-Al5FeSi in the high-Cu alloy increased the number of crack initiators and brittleness of the alloy. Increasing Cu content in the Al-14.5Si-0.5Mg alloy also promoted solution hardening and precipitation hardening under as-quenched and aging conditions, respectively. The hardness of the high-Cu alloy therefore exceeded that of low-Cu alloy.

Original languageEnglish
Pages (from-to)1074-1079
Number of pages6
JournalMaterials Characterization
Volume61
Issue number11
DOIs
StatePublished - Nov 2010

Keywords

  • Acicular β-AlFeSi
  • Al MgFeSi
  • Al-14.5Si-0.5Mg alloy
  • Cu content

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