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

摘要

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 alpha fiber texture component (< 110 >//rolling direction) is very strong after 90 pct rolling at room temperature; however, there is evidence that the gamma 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 deg 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 draw-ability, the best that can be achieved in terms of press performance of this alloy is most likely a Lankford parameter of unity.