Influence of yttrium addition on the corrosion behaviour of as-cast Mg–8Li–3Al–2Zn alloy. Issue 7 (3rd May 2017)

• Record Type: Journal Article
• Authors: Gu, M.; Wei, G.; Zhao, J.; Liu, W.; Wu, G.
• Is Part Of: Materials science and technology. Volume 33:Issue 7(2017)
• Page Start: 864
• Page End: 869
• Publication Date: 2017-05-03
• Subjects: Corrosion behaviour -- Yttrium -- Mg–Li alloy; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2016.1244140
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The influence of yttrium on the microstructure and corrosion behaviour of as-cast Mg–8Li–3Al–2Zn–xY alloys was investigated. The results show that Y addition leads to the formation of Al2 Y particles and the transformation of α-Mg from the long needle-like to the round-like. The noble Al2 Y particles on the grain boundary inhibit the galvanic corrosion between β-Li phase and α-Mg phase, and also weaken the corrosion occurrence inside β-Li phase due to the decrease of the AlLi phase. With Y addition, the corrosion resistance is improved gradually, especially when the content of Y is up to 1.5 wt-%. Moreover, Y addition makes the corrosion film become more compact, which can prevent the base materials from being attacked continuously.