Texture Development in a Cold-Rolled and Annealed Body-Centered-Cubic Mg-Li Alloy

Abstract

The rolling and annealing textures formed in bcc Mg 14 wt pct Li have been investigated and compared with interstitial-free (IF) and more heavily alloyed ferritic steel rolled at the same temperature. The a fiber texture component (<110>//rolling direction) is very strong after 90 pct rolling at room temperature; however, there is evidence that the c fiber ({111}//rolling plane) weakens with increasing rolling strain to give a peaklike texture centered on {111}<110>. A rarely found cold rolling fiber texture has been identified, which has {100}// rolling plane and peaks at {100}<014>. Annealing at 200°C very rapidly produces {554}<225>, which gives way to components near {111}<123> on grain growth. The a fiber is destroyed by recrystallization; however, the {100}//rolling plane fiber shifts intensity from the as-rolled orientation {100}<014> to {100}<012>. Since texture largely determines drawability, the best that can be achieved in terms of press performance of this alloy is most likely a Lankford parameter of unity.

Phase stability, mechanical property, and electronic structure of Mg–Li system

“…Another interesting aspect of the Mg-Li system is that it could be regarded as a kind of ultralight materials with high specific strength, and is a promising candidate for commercial transport, aerospace and high-performance applications [6][7][8][9][10]. For example, the Mg-Li alloys were reinforced as a composite matrix by a series of fibers such as carbon, alumina and silicon carbide [7,8].…”

Microstructures and Mechanical Properties of As-Cast and Hot-Rolled Mg-8.43Li-0.353Ymm (Y-riched mischmetch) Alloy

“…[2,3] Nowadays, Mg-Li alloys are still drawing increasing academic and experimental interests for their good performances and potential use as components of automobiles and portable electronic devices. Recently, interests have focused on various aspects, such as preparing Mg-Li alloys by electrolysis in molten salt [4][5][6][7][8][9][10][11][12][13][14] and noncrystalline bulk Mg-Li alloys by rapid quenching, [15] developing new Mg-Li alloys through ab initio calculations, [16][17][18][19] characterizing Mg-Li alloys with the electron backscatter diffraction (EBSD) method, [20][21][22][23] improving mechanical properties via using severe plastic deformation (SPD) such as equal channel angle extrusion (ECAE), [24,25] among others.…”

“…Efforts of traditional methods are still prevailing to improve strengths by the addition of alloying elements [26][27][28] and mechanical processing, [20,[29][30][31][32][33][34][35][36][37] as a result of their efficiency and economy. Previous works indicate that rare earth (RE) elements, especially the Y element, can improve the mechanical properties of Mg-Li alloys, [26][27][28] and even enable duplex Mg-8Li alloys to present super-plasticity.…”

“…Previous works indicate that rare earth (RE) elements, especially the Y element, can improve the mechanical properties of Mg-Li alloys, [26][27][28] and even enable duplex Mg-8Li alloys to present super-plasticity. [26] Among the mechanical processing efforts, the rolling procedure is demonstrated to introduce microstructure improvement, [20,31,32] even grains with an ultra-low grain size of~1 lm, [33] to Mg-Li alloys. After rolling, the hardness and strength of Mg-Li alloys are enhanced, [34,35] and the elongation is improved up to 60 pct at room temperature.…”

“…However, Mg-Li alloys of a single b-Li phase, with Li contents more than 11 wt pct, are demonstrated to be unsuitable for deep drawing. [20] There is a great enhancement of elongation during the rolling procedure, which seems to be of little connection to the texture of the rolled alloy. The pole figure of the rolled Mg-8.43Li-0.353Ymm alloy is illustrated in Figure 6.…”