Microstructure and properties of LZ91 magnesium alloy processed by asynchronous accumulative roll bonding

Abstract

In order to expand the application prospects of LZ91 magnesium alloy, improve its tensile strength and yield strength. In this paper, the asynchronous rolling and cumulative rolling technology are combined in the large plastic deformation technology, and the LZ91 magnesium alloy after coating the aluminum foil by the asynchronous accumulative roll bonding is performed. The analysis shows that the asynchronous accumulative roll bonding technology accumulates a large amount of deformation energy storage inside the material through large plastic deformation, and refines the grain to the micro-nano level, which increases the strength of the LZ91 magnesium alloy by 86% and the hardness by 63.97%. Improve the internal structure and application performance of the material.

The Promise of Mg-Li Based Alloys for Biomedical Implant Materials

“…Furthermore, the addition of Zn hardens both the  and  phases, and work hardening behavior is enhanced by both Zn addition and an increase of the  phase. A separate study, also reported an increase in strength and a decrease in elongation with rolling passes owing to grain refinement and dislocation tangles for Mg-9Li-1Zn alloy [38]. An investigation on the mechanism of phase refinement of extruded Mg-7.8Li-0.8Zn alloy revealed that severely deformed  phase can be refined by post rolling annealing [39].…”

Superplastic characteristics and forming of LZ91 Mg-Li alloy sheet

“…6,7 With the addition of Li, the c/a ratio decreases from 1.624 (pure Mg) to 1.607 (Mg-17 at.% Li), from which the non-basal slips are operable. [8][9][10][11][12][13][14] Previous work has shown that prismatic slip was prevailing in Mg-Li alloy with increasing lithium contents. 9 When the Li content in Mg ranges from 17 to 30 at.%, the body-centred cubic (BCC) b-lithium phase appears, which improves the formability of Mg alloys dramatically at ambient temperatures.…”