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 α fiber texture component (<110>//rolling direction) is very strong after 90 pct rolling at room temperature; however, there is evidence that the γ 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 α 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.