Abstract
Al–Mg–Sc alloys with fine equiaxed grain structure and free of Mg segregation and dislocations were fabricated by friction stir processing and post-solution treatment to study the deformation behavior of Al Mg base alloys at room and elevated temperatures. The k -value in the Hall–Petch equation of the alloys increased with increasing Mg content, and the equation of k -values and Mg content was displayed. Grain refinement and high Mg content not only could reduce the grain boundary (GB) sliding temperature of Al–Mg–Sc alloys during elevated-temperature deformation but also enhance their high-temperature GB sliding capacity. • k -value in H P equation of Al–Mg–Sc alloys increased with increasing Mg content. • k -value of Al–Mg–Sc alloys was developed in the form of k = − 80.56 × exp − c 1.94 + 148.2 . • Grain refinement and high Mg content reduced the GB sliding temperature. • Grain refinement and high Mg content promoted the high-temperature GBs sliding.
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