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研究双辊铸轧和冷轧AA5083铝合金在H321应变硬化态下的显微组织和力学性能。通过15°倾斜后双辊铸轧机在490 mm/min铸造速度下制备厚8.90 mm、宽1260 mm厚板,板材表面完好。经520°C均匀化处理后,材料冷轧至6.30 mm和3.85 mm两种厚度的板材,并在370°C进行中间退火和180°C进行稳定化退火。光学显微镜和扫描电子显微镜研究表明金属间化合物颗粒主要聚集在晶界处,这也是拉伸断口中晶粒剥离的原因。另外,力学性能研究表明,经过均匀化处理后,晶界偏聚消除,合金的伸长率得到提高。由于在冷轧阶段得到足够大的压下量,3.85 mm厚板的性能符合ASTM B 290M标准的H321态性能。
The microstructure and mechanical properties of AA5083 aluminum alloy with double roll cast and cold rolled in H321 strain hardening state were studied. A sheet of 8.90 mm in thickness and 1260 mm in width was prepared at a casting speed of 490 mm / min by a 15 ° inclined back twin roll casting mill and the surface of the sheet was intact. After 520 ° C homogenization, the material is cold-rolled to a thickness of 6.30 mm and 3.85 mm, with intermediate annealing at 370 ° C and stabilization annealing at 180 ° C. Optical and scanning electron microscopy studies have shown that the intermetallic particles mainly in the grain boundary, which is the reason why the tensile fracture in the grain. In addition, the mechanical properties of the study shows that, after homogenization treatment, grain boundary segregation eliminated, the alloy elongation increased. Due to the large reduction achieved during the cold rolling phase, the 3.85 mm thick plate meets the H321 behavior of the ASTM B 290M standard.