Aging response and precipitation behavior after 5% pre-deformation of an Al-Mg-Si-Cu alloy

Shuoxun Jin, Tungwai Ngai, Liejun Li, Shian Jia, Tongguang Zhai, Dongjie Ke

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this study, Al-1.00 Mg-0.65 Si-0.24 Cu alloy was solution heat-treated, water-quenched, and then pre-deformed for 5% before aging. The peak hardness and yield strength of the pre-deformed sample with subsequent artificial aging were similar to that of a T6 condition sample. It was also found that the pre-deformation treatment could inhibit the negative influence of natural aging to some degree. After seven days of natural aging, the pre-deformed sample obtained better peak hardness and yield strength upon artificial aging than the sample without pre-deformation. In addition, the pre-deformation treatment could reduce 50% of the artificial aging time to reach the peak aging condition compared with T6 treatment. For the peak aged condition in the pre-deformed sample, transmission electron microscopy (TEM) observation found two types of precipitates exhibited along the dislocations besides the β" precipitates in the Al matrix. Both precipitates had disordered atomic arrangements on the ordered subcell (Si network). The disordered precipitates occupied a number of Mg and Si atoms, resulting in less β" precipitates formed during artificial aging at 180 °C.

Original languageEnglish
Article number1422
Issue number8
StatePublished - Aug 13 2018

Bibliographical note

Publisher Copyright:
© 2018 by the authors.


  • Al-Mg-Si-Cu alloy
  • Mechanical properties
  • Pre-deformation
  • Precipitation behavior

ASJC Scopus subject areas

  • Condensed Matter Physics
  • General Materials Science


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