Effect of icosahedral phase on the crystallographic texture and mechanical anisotropy of duplex structured Mg–Li alloys. (25th December 2015)

• Record Type: Journal Article
• Authors: Xu, D.K.; Li, C.Q.; Wang, B.J.; Han, E.H.
• Is Part Of: Materials & design. Volume 88(2015:Dec.)
• Page Start: 88
• Page End: 97
• Publication Date: 2015-12-25
• Subjects: I-phase -- Duplex structure -- Texture -- Mechanical anisotropy -- Fracture; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.08.123
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Through comparing the microstructure and mechanical properties of Mg–6%Li and Mg–6%Li–6%Zn–1.2%Y alloys, the difference in their mechanical anisotropy have been deeply investigated. Due to the formation of I-phase (Mg3 Zn6 Y, icosohedral structure), the volume fraction of β-Li phases formed in Mg–6%Li–6%Zn–1.2%Y alloy was two times higher than that in Mg–6%Li alloy even these two alloys having the same Li content. Texture analysis demonstrated that I-phase particle stimulated nucleation of recrystallization (PSN) and the formation of higher volume fraction of β-Li phases can remarkably weaken the basal texture of α-Mg phases, resulting in a very weak mechanical anisotropy. On the contrary, the basal texture of the α-Mg phases in Mg–6%Li alloy was quite strong and obvious mechanical anisotropy between differently oriented samples can be observed. Graphical abstract: Highlights: I-phase strengthened Mg–Li alloy has a weaker basal texture of α-Mg phases. I-phase strengthened Mg–Li alloy exhibits a weaker mechanical anisotropy.