Effect of annealing temperature on the microstructure and mechanical properties of an as-rolled Mg-9wt.%Li-3wt.%Al-1wt.%Zn alloy sheet

Meng Chang Lin, Shang Qiu Lin, Jun Yen Uan

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This study investigated the effect of annealing temperature on the mechanical properties of an as-rolled Mg-9.26wt.%Li-3.03wt.%Al-1.10wt.%Zn (LAZ931) alloy sheet. The dual-phase (α + β) LAZ931 alloy plate of 3 mm in thickness were rolled (67% reduction) and then annealed at temperatures at 100°C–350°C. The alloy’s ductility showed a sharp concave downward tendency as a function of annealing temperature. The elongation of the LAZ931 alloy sheet increased with annealing temperature up to 150°C, followed by a sharp decrease of the alloy’s ductility as the annealing temperature higher than 150°C. The specimen exhibited an extremely low elongation (only ∼0.5%) at annealing temperature around 300°C. Formation of brittle AlLi particles on boundary resulted in Li depletion zone near by grain boundary, transforming the Li depletion zone into α (hcp) layer. The combined effects including brittle AlLi particles on boundary and the hcp α layer on boundary resulted in the brittlement of the high-temperature-annealing sample.

Original languageEnglish
Pages (from-to)271-280
Number of pages10
JournalFrontiers of Materials Science
Volume8
Issue number3
DOIs
Publication statusPublished - Sep 2014
Externally publishedYes

Keywords

  • AlLi
  • annealing
  • embrittlement
  • Mg-Li alloy

ASJC Scopus subject areas

  • Materials Science(all)

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