Precipitation behavior and its effect on the dynamic recrystallization of a novel extruded Al-Cu-Li alloy

• Published in: Materials & design Vol. 223; p. 111135
• Main Authors: Wang, Kuizhao, Zhang, Cunsheng, Meng, Zijie, Cheng, Zinan, Chen, Liang, Zhao, Guoqun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2022; Elsevier
• Subjects: Al–Cu–Li alloy; Dynamic recrystallization (DRX); Lamellar grain; Precipitation behavior; Texture evolution; Dynamic recrystallization (DRX); Precipitation behavior; Lamellar grain; Texture evolution; Al–Cu–Li alloy
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2022.111135

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•The dominant recrystallization mechanism gradually changed from DDRX to CDRX/GDRX with increasing temperature, decreasing strain rate and solid solubility of the alloy.•A lamellar grain nucleated was discovered in the 〈110〉 fiber during the R-cube transformation to copper, and its growth induced the GDRX.•Precipitation only affected the volume fraction of recrystallization and did not alter the recrystallization mechanism.•The coupling effect of DPN and solution strengthening in as-soluted alloys exhibited strong recrystallization resistance.
Dynamic recrystallization (DRX) is one of the more convenient and effective means of refining grains during hot deformation, which is closely related to the precipitation behavior. Three alloys with varying pre-precipitations are designed by carrying out different heat treatment processes to explore the effects of precipitation on the recrystallization behavior of an Al–Cu–Li alloy during compression. It is indicated that the recrystallization behavior of the as-extruded alloy is quite sensitive to the precipitation. Precipitation does not change the recrystallization mechanism, but it could significantly affect the recrystallization volume fraction (VDRX). Meanwhile, the diverse extruded texture fibers coordinate deformation through different softening mechanisms during compression, which stimulates the nucleation of the lamellar grain in R–cube textures. Furthermore, the influence mechanism of microstructure on the material flow behavior is also discussed for the three heat-treated alloys. Therefore, this work is expectedto provide new insights for Al–Cu–Li alloy to design high-performance products through grain refinement and texture modification in the subsequent processing.