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- Title
A high-specific-strength and corrosion-resistant magnesium alloy.
- Authors
Xu, Wanqiang; Birbilis, Nick; Sha, Gang; Wang, Yu; Daniels, John E.; Xiao, Yang; Ferry, Michael
- 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 difficult 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.
- Subjects
MAGNESIUM alloys; STRENGTH of materials; DUCTILITY; CORROSION resistance; NANOSTRUCTURES; LITHIUM; MECHANICAL behavior of materials
- Publication
Nature Materials, 2015, Vol 14, Issue 12, p1229
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat4435