Severe plastic deformation (SPD) processes have received less attention at low temperatures (sub-zero and cryogenics). Hence, in this study, SPD of a commercially pure aluminum (AA1050) through Multi-Directional Forging (MDF) at Low-Temperature (LTMDF) and Room-Temperature (RTMDF) is investigated for different strains. Multi-directionally forged (MDFed) samples were annealed at 150, 250, 350, and 450 °C for 1 h, and some samples were stored at room temperature for periods up to 1 year. Results show that the hardness values and flow stress of LTMDFed aluminum are higher than those of RTMDFed ones. The ratio of yield strength to hardness for LTMDF is similar to that for RTMDF. Surprisingly, the work-hardening exponent of LTMDFed aluminum is higher than that of RTMDFed samples, which probably can be due to the increase in mobile dislocation fraction as a result of suppression of dynamic recovery. Microstructural evolutions, hardness, and flow stress changes of annealed samples indicate that LTMDFed samples are more affected than RTMDFed ones and have weak thermal stability because of the non-equilibrium microstructure. The study of self-annealing suggests a rather dramatic decrease in the hardness values of LTMDFed samples during a one-year period, which is not tangible for RTMDFed ones. LTMDF leads to grain coarsening during self-annealing, presumably owing to extended static recovery at room-temperature.

严重的塑性变形 (SPD) 过程在低温（低于零和低温）下受到的关注较少。因此，在本研究中，研究了在低温 (LTMDF) 和室温 (RTMDF) 下通过多向锻造 (MDF) 对不同应变的商业纯铝 (AA1050) 的 SPD。多向锻造 (MDFed) 样品在 150、250、350 和 450°C 下退火 1 小时，一些样品在室温下储存长达 1 年。结果表明，LTMDFed 铝的硬度值和流动应力高于RTMDFed 铝的硬度值和流动应力。LTMDF 的屈服强度与硬度之比与 RTMDF 相似。令人惊讶的是，LTMDFed 铝的加工硬化指数高于 RTMDFed 样品，这可能是由于抑制动态恢复导致移动位错分数增加。退火样品的显微组织演变、硬度和流动应力变化表明，LTMDFed 样品比 RTMDFed 样品受到的影响更大，并且由于非平衡微观结构而具有较弱的热稳定性。自退火研究表明，LTMDFed 样品的硬度值在一年期间出现了相当显着的下降，这对于 RTMDFed 样品来说是不明显的。LTMDF 在自退火过程中导致晶粒粗化，这可能是由于室温下延长的静态恢复。退火样品的流动应力变化表明，LTMDFed 样品比 RTMDFed 样品受到的影响更大，并且由于非平衡微观结构而具有较弱的热稳定性。自退火研究表明，LTMDFed 样品的硬度值在一年期间出现了相当显着的下降，这对于 RTMDFed 样品来说是不明显的。LTMDF 在自退火过程中导致晶粒粗化，这可能是由于室温下延长的静态恢复。退火样品的流动应力变化表明，LTMDFed 样品比 RTMDFed 样品受到的影响更大，并且由于非平衡微观结构而具有较弱的热稳定性。自退火研究表明，LTMDFed 样品的硬度值在一年期间出现了相当显着的下降，这对于 RTMDFed 样品来说是不明显的。LTMDF 在自退火过程中导致晶粒粗化，这可能是由于室温下延长的静态恢复。