Microscopic characterization of semi-solid aluminium alloys

Ya Lin Lu, Miao Quan Li, Xing Cheng Li, Xiao Ping Li

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The microstructural evolution and element distribution of the Al-4Cu-Mg alloy during semi-solid compression were investigated, and the precipitate behavior and dislocation morphology were discussed. The experimental results show that the microstructure, the number of CuAl2 (θ phase) precipitates, and the dislocation density of the Al-4Cu-Mg alloy depend apparently on the process parameters. More segregation of Cu at the grain boundary happens with an increase of deformation temperature and a decrease of strain rate, leading to an increase in the number of θ phase. With an increase of height reduction, Cu segregation at the grain boundary decreases gradually. Moreover, unique dislocation morphologies including helical dislocations and dislocation loops appear at different process parameters and evolve to reduce the stored energy.

Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalInternational Journal of Minerals, Metallurgy and Materials
Volume17
Issue number3
DOIs
StatePublished - Jun 2010

Keywords

  • Aluminum alloys
  • Dislocation
  • Microstructural evolution
  • Semi-solid state

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