研究在不施加和施加12 T强磁场条件下，于150~400°C下退火1 h后，经热轧和低温等径角挤压(cryoECAP)制备的1050铝合金的硬度和显微组织的演化规律。通过背散射电子衍射(EBSD)和透射电子显微镜(TEM)表征晶粒的显微结构和位错。研究表明：在cryoECAP变形前进行热轧可使cryoECAP制备的1050铝合金产生更多更小尺寸的等轴晶以及更多的大角度晶界(HABs)，这些都能在随后的退火过程中促进合金的回复和再结晶且使合金组织变得更加均匀。在150~250°C施加强磁场退火能促进回复和再结晶过程，并且使硬度值明显降低。在300~400°C退火过程中施加磁场能够抑制晶粒的异常长大，促使晶粒尺寸分布更加均匀。
The evolution of hardness and microstructures of 1050 aluminum alloy prepared by hot rolling and subsequent equal- channel angular pressing at cryogenic temperature (cryoECAP) after annealing at 150?400 °C for 1 h without and with magnetic field of 12 T was investigated. The electron back scattering diffraction pattern (EBSD) and transmission electron microscopy (TEM) were utilized to characterize the grain microstructures and dislocations. It is demonstrated that the hot rolling before cryoECAP produces more equiaxed grains with a smaller average size and a higher fraction of high angle boundaries (HABs) in the subsequent cryoECAPed 1050 aluminum alloy, thus accelerating the recovery and recrystallization of cryoECAPed alloy and produces more homogeneous microstructure during annealing. The magnetic field promotes the recovery and recrystallization and leads to much lower hardness at 150?250 °C, while it can suppress the abnormal grain growth and form more homogeneous grain size distributions annealed at 300?400 °C.
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