强磁场下纯铜板再结晶晶体取向的形成过程和演变机理

In the present project, the recrystallized nuclei formation and its growth processing of pure copper under a high magnetic field were systematically observed and analysed by EBSD. The law of formation and evolution of recrystallized crystallography orientation induced by a high magnetic field was discussed and analysed. The effect of magnetic field intensities and directions on crystallography orientation evolution and grain boundary migration of pure copper during recrystallization were studied. The recrystallized behaviors of pure copper under a high magnetic field were theoretically analysis from micro-levels. The mechanisms of action of the magnetic field on the crystallography orientation formation and evolution during recrystallization were clarified. Combining the characteristics of the effect of high magnetic field on crystallograhy orientation of diamagnetic materials, the nature of the formation and evolution of recrystallized texture of pure copper under high magnetic field was announced and corresponding physical model was built..The achivement of this project will clarified the mechanism of action of the magnetic field on the crystallography orientation formation and evolution of diamagnetic materials during recrystallization at a bran-new point. A new connotation is added to the research of recrystallized texture of metal meaterials under a high magnetic field annealing. The theory of high magnetic field materials science is enriched. The theoretical basic that controling the texture of materials and improving its mechanical properties using a high magnetic field annealing is established. The valuable reference about pure copper application in the condition of magnetic field is provided.

本项目拟采用实验研究与理论分析相结合的方法，借助于电子背散射（EBSD）测试分析手段，全面系统地观察和测试强磁场作用下纯铜板再结晶晶核的形成和长大过程，探讨和分析强磁场下纯铜板再结晶晶体取向的形成和演变规律，研究磁场强度和方向对纯铜板再结晶过程中晶体取向演化和晶界迁移行为的作用效果，从微观层次对强磁场作用下纯铜板的再结晶行为进行理论解析，阐明强磁场作用下纯铜板再结晶晶体取向的形成过程和演变机理，结合强磁场对抗磁性材料晶体取向的作用特点，揭示其物理本质，并构建相应的物理模型。.该研究取得的成果将从一个全新的角度解析强磁场作用下抗磁性材料再结晶晶体取向形成过程和演变机理，为强磁场下金属材料的再结晶织构研究增添新的内涵，丰富强磁场材料学理论，并且为利用强磁场热处理这一极端条件，调控材料织构从而改善其性能奠定理论基础，另外还能为强磁场环境中纯铜板的制备与服役提供有价值的参考。

研究强磁场作用下抗磁性材料再结晶晶体取向形成过程和演变机理，可以丰富强磁场材料学理论，并且为利用强磁场热处理调控材料织构从而改善其性能奠定理论基础。本项目全面系统地研究了强磁场作用下纯铜板再结晶微观组织和晶体取向的形成和演变规律，研究了磁场强度和方向对纯铜板再结晶过程中晶体取向演化和晶界迁移行为的作用效果，并对相应的影响机制进行了详细的阐述。研究结果表明，与非磁场退火样品相比较，在再结晶初期，磁场阻碍了冷轧纯铜板的回复和再结晶进程，随着磁场强度的增加，这种阻碍作用增强。这是由于施加磁场作用所附加在系统上的磁自由能阻碍了冷轧纯铜板再结晶初期形变储能的释放。并且这种阻碍作用与磁场强度成正比关系。当磁场施加方向与冷轧纯铜板的轧制方向在轧面内夹角为60°时，纯铜板内再结晶立方织构组分强度最大。这是由于磁场施加方向不同所引起的磁驱动力不同而导致的晶界选择性迁移所致。