TEXTURE EVOLUTION DURING NORMAL AND ABNORMAL GRAIN GROWTH IN AN Al-1 WT percent Mn ALLOY

摘要

The texture evolution during normal and abnormal grain growth in an Al-1 wt percent Mn alloy was studied. Prior to deformation the amount of precipitates was enhanced by annealing at 500 deg C for 4 days (3.5 X 10~5 s). After 80 percent cold rolling and recrystallization the alloy had a weak cube ({001}) texture and a minority texture component, the A Component, related to the cube texture by a #SIGMA#5 (36.9 deg ) orientation relationship. After limited normal grain growth both the cube and the A component were strengthened. However, both after abnormal grain growth and after extensive normal grain growth, the A component became the dominant texture component. The result is interpreted based on the assumption that #SIGMA#5 boundaries can migrate faster than other boundaries in this alloy. Possible reasons to support this hypothesis are discussed. The situation bears resemblance to abnormal grain growth in Fe-3 wt percent Si allays, where special properties are attributed to #SIGMA#9 boundaries.