A high-specific-strength and corrosion-resistant magnesium alloy

Wanqiang Xu, Nick Birbilis, Gang Sha, Yu Wang, John Daniels, Yang Xiao, Michael Ferry

Research output: Contribution to journalArticleResearchpeer-review

285 Citations (Scopus)

Abstract

Ultra-lightweight alloys with high strength, ductility and corrosion resistance are desirable for applications in the automotive, aerospace, defence, biomedical, sporting and electronic goods sectors. Ductility and corrosion resistance are generally inversely correlated with strength, making it dicult to optimize all three simultaneously. Here we design an ultralow density (1.4 g cm􀀀3) Mg–Li-based alloy that is strong, ductile, and more corrosion resistant than Mg-based alloys reported so far. The alloy is Li-rich and a solute nanostructure within a body-centred cubic matrix is achieved by a series of extrusion, heat treatment and rolling processes. Corrosion resistance from the environment is believed to occur by a uniform lithium carbonate film in which surface coverage is much greater than in traditional hexagonal close-packed Mg-based alloys, explaining the superior corrosion resistance of the alloy.
Original languageEnglish
Pages (from-to)1229 - 1235
Number of pages7
JournalNature Materials
Volume14
Issue number12
DOIs
Publication statusPublished - 2015

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