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用光学显微镜和电子显微镜研究了:在某一温度(-180℃,-80℃,20℃)下的预先拉伸对铝(纯度为99.99％)单晶体以后继续在另一温度(80℃,20℃,-80℃,-180℃)下拉伸时形变结构变化的影响。预形变量为10％,后来的形变量为1％,10％,40％。形变速度约为1％/秒。将得到的一些结果,在它们彼此间以及与形变过程中温度不改变的情形(20℃,-80℃,-180℃)作了比较。此外,并用在每拉伸0.3％后即照一次光学显微镜相的方法,研究了单晶体表面形变结构变化的动态过程。结果的分析指出,形变单晶体的结构也和流变应力一样,不是形变瞬时温度的单值函数,而是和预形变温度有关的。以预先的形变中和后来的形变中的硬化及回复过程的效果,对所观察到的单晶体形变表观结构的特点作了解释。
Optical and electron microscopes were used to investigate the effect of pre-stretching single crystals of aluminum (purity 99.99%) at a certain temperature (-180 ° C, -80 ° C, 20 ° C) ℃, -80 ℃, -180 ℃) tensile deformation under the impact of structural changes. Preform variable is 10%, the subsequent deformation is 1%, 10%, 40%. Deformation speed is about 1% / sec. Some of the results obtained were compared between them and with no change in temperature during the deformation (20 ° C, -80 ° C, -180 ° C). In addition, the dynamic phase change of the single crystal was studied by using optical microscopy after stretching 0.3%. The analysis of the results indicates that the structure of the deformed single crystal is the same as the flow stress, not a single-valued function of the instantaneous temperature of the deformation, but rather relates to the pre-deformation temperature. The characteristics of the observed single crystal deformation apparent structure are explained by the effects of pre-deformation and subsequent hardening and recovery processes in the deformation.