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采用分离式霍普金森压杆对1050商业纯铝进行了高应变速率(2.7×10~3s~(-1)变形。试样随后进行100~250℃保温1h的退火。用透射电子显微镜观察了组织。结果表明:变形试样组织主要为拉长的片层状亚晶粒,横向和纵向平均晶粒尺寸分别为276、704nm,原始粗晶粒得到明显细化;当退火温度低于200℃时,试样组织依然为片层状,晶粒稍微粗化;250℃/1 h退火后试样微结构显著粗化,平均晶粒尺寸长大至4.9μm,并且试样组织中出现了再结晶晶粒。为了保持试样组织结构的稳定性,该试样使用温度必须低于250℃。
The high strain rate (2.7 × 10 ~ 3s -1) deformation of 1050 commercial pure aluminum was carried out by using the split Hopkinson pressure bar.The samples were annealed at 100 ~ 250 ℃ for 1h.The microstructure of the samples was observed by transmission electron microscopy The results show that the microstructures of the deformed specimens are mainly elongated lamellar subgrains with average grain sizes of 276 and 704 nm in the transverse and longitudinal directions, respectively, and the original coarse grains are obviously refined. When the annealing temperature is below 200 ℃ , The microstructure of the sample is still lamellar and the grains are slightly roughened. The microstructure of the sample is significantly roughened after annealing at 250 ℃ for 1 h, the average grain size grows up to 4.9 μm, and the microstructure of the specimen appears again In order to maintain the stability of the structure of the sample, the temperature of the sample must be lower than 250 ℃.