Effect of Annealing Treatment on the Microstructure and Texture of Aluminum-Scandium Alloy AITranslate

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Chinese Library Classification Number:TG166.3[金属学及工艺]

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Taking Al-9.6%Sc alloy as the research object,the changes in microstructure,microstructure composition,hardness,grain orientation and grain boundary distribution characteristics of as-cast alumi-num-scandium alloy before and after homogenizing annealing were analyzed using scanning electron micro-scope(SEM),energy dispersive spectrometer(EDS)and electron backscatter diffraction(EBSD).The re-sults show that with the extension of annealing time,the Al₃Sc grains in the aluminum-scandium alloy mi-crostructure undergo recrystallization and grain growth,and the microhardness of the alloy decreases.After homogenizing annealing,the Al₃Sc grains transform from long rod-shaped dendritic structures to sheet-like equiaxed crystals,and the elements in the alloy undergo solid-state diffusion.The maximum deviation be-tween the radial Sc content(mole fraction)of the target blank and the nominal composition decreases from 1.81%to 0.6%,and the average grain size increases by 122.7%from 23.3μm to 51.9μm,with a more uniform grain distribution.Compared with the as-cast alloy,the texture is enhanced,and the proportion of small angle grain boundaries increases.Homogenizing annealing effectively reduces the micro-segregation of the alloy,which is beneficial for obtaining a uniform Al₃Sc structure and a grain orientation distribution that tends to be consistent.