Room temperature aging characteristic of MgLiAlZn alloy

Chang Chan Hsu, Jian Yih Wang, Shyong Lee

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Making alloys of Mg and Li is quite a task as their individual melting temperatures are vastly different. However, it is thought paid off considering their extreme lightness. Basically, low melting temperature Li could cause Mg-Li alloys' microstructures change at room temperature (R.T.). Recrystallization and aging of Li-rich solid solution phase (ß) can proceed under R.T. Previously. R.T. aging phenomenon was mentioned without in-depth analysis. This paper fills up the blank by working on Mg-11.2%Li-0.95%Al-0.439cZn (mass%). mainly due to the TEM work brought in. With this apparatus for analysis, a transition precipitate (tentatively called pre-θ phase) is revealed. This pre-θ precipitation is responsible for the distinctive strengthening in the initial stage of R.T. aging. However, it is unstable and subsequently transforms to θ or α phase. Both of these later precipitates are little effective in producing aging strengthening.

Original languageEnglish
Pages (from-to)2728-2731
Number of pages4
JournalMaterials Transactions
Volume49
Issue number11
DOIs
StatePublished - Nov 2008

Keywords

  • Aging
  • Magnesium-lithium alloy
  • Mechanical property
  • Precipitation

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