GRAIN BOUNDARY CHARACTER DISTRIBUTION, TEXTURE AND SUPERPLASTIC DEFORMATION BEHAVIOR OF AN Al-Li ALLOY

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The grain boundary character distribution and the texture of 2091 Al Li alloy recrystallized at different temperatures were measured by TEM and X ray techniques respectively. The occurrence frequency of low energy boundaries decreases with increasing recrystallization temperature, while the frequency of high energy boundaries increases. The strongest component of recrystallization texture in the test temperature range is {011}〈111〉. The relative intensity of the texture tends to decrease with increasing recrystallization temperature. The material which contains a high frequency of low energy boundaries exhibits lower deforming stress and high elongation.