Strengthening and room temperature age-softening of super-light Mg-Li alloys

Jyh Shyan Leu, Chih Te Chiang, Shyong Lee, Yung Hung Chen, Chun Lin Chu

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Extremely light (density ∼1.46 g/cm 3) and highly formable Mg-Li alloys have been drawing research interest; however, their relatively low strength is discouraging, and thus, an issue to be addressed. This paper processes and evaluates four Mg-Li alloys: the first, a basic alloy with a nominal composition of Mg-11%Li-1%Al-0.5%Zn; the second, an alloy with only Be added to the first; the third, an alloy with only Sc added to the first; and the fourth, with both Be and Sc added to the first. This research achieves a high strength of ∼240 MPa for Mg-Li alloys using the processes of solid solution treatment plus 90% heavy rolling. A subsequent natural aging process proceeded spontaneously and resulted in strength decay. Room temperature softening behavior is uncommon, but offers a convenient route for studying age-softening characteristics of metallic alloys.

Original languageEnglish
Pages (from-to)1235-1239
Number of pages5
JournalJournal of Materials Engineering and Performance
Volume19
Issue number9
DOIs
StatePublished - Dec 2010

Keywords

  • heat treating
  • non-ferrous metals
  • rolling

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