کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
831346 | 1470366 | 2011 | 6 صفحه PDF | دانلود رایگان |
Effects of the particles induced by strain on dynamic recrystallization and microstructure of the AA7050 aluminum alloy were investigated during hot deformation using X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD). Experimental results showed that partial recrystallized grains containing little sub-structure were produced during the solution treatment. Numerous particles were successfully obtained by the strain-induced precipitation during first-pass deformation at 573 K. The deformation promoted spheroidization and refinement of the precipitate particles. Then these particles pinned dislocations and grain boundaries inhibiting dynamic recrystallization during second-pass high-temperature deformation at 673 K and low angle grain boundary fraction was increased significantly to 83.8%. Furthermore, the tensile test indicated that microstructure with numerous low angle boundaries (LAGBs) and 5 μm sub-grains had increased the strength and ductility of the AA7050 aluminum alloy.
► Experimental two-pass deformation process is different from conventional rolling.
► Globular precipitates were accelerated to produce by first-pass deformation.
► Second-pass deformation produced low angle grain boundaries owing to precipitates.
► Microstructure with numerous sub-structures had increased strength and ductility.
Journal: Materials & Design - Volume 32, Issues 8–9, September 2011, Pages 4241–4246