Magnetic-Field-Assisted Preparation of Serrated Grain Boundaries of Semi-solid Al-Cu Hypoeutectic Alloy
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摘要: 金属材料中的锯齿形晶界可显著提高材料的蠕变性能,并减缓应力腐蚀开裂。通过在合金半固态热处理过程中施加外加磁场,即可在无预变形或高温原位变形的条件下,形成形状可控的微米级锯齿形晶界。结果表明,在无预变形或原位变形的情况下,外加磁场促使Al-Cu亚共晶合金在半固态热处理过程中出现锯齿形晶界。随着磁感应强度的增加,锯齿形晶界的数量占比显著上升至61.06%。在外加磁场作用下,锯齿形晶界的形成机制可能归因于位错辅助的晶界迁移以及液膜迁移。这种晶界形态的变化为铝基材料力学性能的提高提供了新的可能。Abstract: The serrated grain boundaries can promote the creep property and retard the corrosion cracking of material. Therefore, we apply magnetic field in the process of semi-solid heat treatment to form the shape-controllable micron-scale serrated grain boundaries without pre-deformation or high-temperature in-situ deformation. Experimental results indicate that without pre-deformation nor high-temperature in-situ deformation, the application of an external magnetic field successfully enables the formation of shape-controllable micron-scale serrated grain boundaries. As the external magnetic induction intensity increases, the proportion of serrated grain boundaries progressively increases to 61.06%. Under the influence of the external magnetic field, the formation of serrated grain boundaries is closely related to the dislocation-assisted grain boundary migration and quasi-liquid film migration. The transformation of grain boundary morphology makes the development of aluminum-based materials with excellent mechanical properties possible.
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