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采用工业设备,将两种纯度(99.999%和99.7%)的铝毛坯,在250℃挤压成10毫米的棒材(济压比,25∶1)。在空气中冷却,用光学显微镜和透射电子显微镜(包括 kikuchi 线分析法),研究了它们的最终显微组织。低纯铝挤压品的精细显微组织由直径为2微米的亚晶粒构成,这些亚晶粒是动态回复形成的。虽然高纯铝材的显微组织结构和晶粒大小都与前者相似,但其取向混乱,经测定发现,这种挤压材是由
Using industrial equipment, two aluminum blanks (99.999% and 99.7%) were extruded at 250 ° C into 10 mm bars (25: 1 pressure-relief ratio). After cooling in air, their final microstructure was studied using an optical microscope and a transmission electron microscope (including kikuchi line analysis). The fine microstructure of the low-purity aluminum extrusion consists of subgrains with a diameter of 2 μm, and these subgrains are formed dynamically. Although the microstructure and grain size of the high-purity aluminum are similar to the former, its orientation is disordered. According to the determination, the extruded material is composed of