Paper Title:
Formation of the Surface Oxide Film on as-Cast Mg-7Li Alloy
  Abstract

The excellent properties of Mg-Li alloys make them suitable light fabrication materials used extensively in many applications. The microstructure and the surface oxide film at different temperature of as-cast Mg-7Li alloy were investigated by optical microscope(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) and electronic analytical balance. Results showed that Mg-7Li alloy was composed of mainly α phase and β phase. With increasing temperature, the morphology of the alloy surface varied from the formation of a very thin oxide film, large amounts of oxide particles to the thick and coarse film with a mass of cellular protuberances in size of 40-80μm. The ratio of oxidation weight gains rose from 0.08% to 11.58%. The surface oxide film consisted of mainly magnesium oxide(MgO) phase and lithium peroxide(Li2O2) phase, resulting from the reaction of oxygen with Mg and Li. The volume of the oxides on β phase greater than that on α phase led to the formation of cellular protuberance on the surface of Mg-7Li alloy at high temperature.

  Info
Periodical
Advanced Materials Research (Volumes 239-242)
Edited by
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
Pages
1082-1087
DOI
10.4028/www.scientific.net/AMR.239-242.1082
Citation
J. G. Li, Y. Lv, M. Q. Li, Z. J. Wei, X. C. Meng, "Formation of the Surface Oxide Film on as-Cast Mg-7Li Alloy", Advanced Materials Research, Vols. 239-242, pp. 1082-1087, 2011
Online since
May 2011
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$32.00
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