To study the slip and recrystallization mechanisms in high purity aluminum, a single crystal of 99.999 mass÷ purity was ten sile_ deformed along aq001rdirection at 77 K and subsequently annealed. The deformation stress decreased by about 15÷ (15 MPa), compared with the previously reported 99.99 mass÷ aluminum single crystal with the same tensile orientation. Slip struc ture was very uniform, characterized by frequent short_ distance cross_ slip. No deformation band was observed. After annealing, many recrystallized grains (RGs) were formed. About 80÷ of the RGs hadq111rrotation relationship with the orientation of the deformed matrix. There was no large difference in the occurrences of the fourq111rrotation relationships. For eachq111raxis, both clockwise and counterclockwise rotations were found.

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