退火工艺对镁/石墨烯/铝层状复合材料组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.11.026

摘要/Abstract

摘要： 利用温轧工艺成功实现了镁/石墨烯/铝层状复合材料的成形制备,重点研究了退火工艺(分别在200 ℃保温60、90和120 min)对该复合板材,尤其是异质界面的组织演变和力学行为的影响。结果表明,在温轧后添加石墨烯的镁/铝层状复合材料形成了较厚的中间层,由未添加石墨烯的3.6 μm增加到4.3 μm,主要由较薄的镁铝扩散层和石墨烯组成。界面层形貌和组织在退火中发生了明显改变,石墨烯、Mg₁₇Al₁₂和Al₃Mg₂组成的界面层逐渐融合,由不连续的界面层向连续演变。添加石墨烯的复合板材,表现出较好的力学性能,抗拉强度为225 MPa,伸长率为7.8%。随着退火时间的增加,抗拉强度逐渐降低,伸长率先增加后降低。在200 ℃×90 min退火条件下,镁层为均匀细小的等轴晶组织,并且复合界面微观组织较好,界面层呈不连续态,复合材料抗拉强度为215 MPa,伸长率为12.6%。大塑性变形能够将石墨烯引入镁/铝界面,在退火过程中,在铝/镁界面处添加的石墨烯能够显著调节界面的微观结构和力学性能,复合材料性能主要来源于基体组织和界面结构的改善。

关键词: 退火, 镁/石墨烯/铝复合材料, 层状结构, 界面演变, 力学性能

Abstract: Layered magnesium/graphene/aluminum composites were successfully fabricated by warm rolling process. The effect of annealing process (at 200 ℃ for 60, 9, 120 min, respectively) on the microstructure evolution, especially the heterogeneous interface, and mechanical properties of the composites was investigated. The results show that after warm rolling process, the magnesium/graphene/aluminum composites form a thicker intermediate layer, increasing from 3.6 μm(without graphene) to 4.3 μm, which is mainly composed of a thinner magnesium aluminum diffusion layer and graphene. The morphology and microstructure of the interface layer undergo significant changes during annealing. The interface layer composed of graphene, Mg₁₇Al₁₂, and Al₃Mg₂ gradually merges, evolving from the discontinuous interface layer to the continuous interface layer. The composite sheet with graphene has good mechanical properties with the tensile strength of 225 MPa and the elongation of 7.8%. With the increase of annealing time, the tensile strength decreases gradually, while the elongation increases first and then decreases. When annealed at 200 ℃ for 90 min, the Mg layer exhibits a uniform and fine equiaxed grain structure, and the microstructure of the composite interface is well, the interface layer is discontinuous, the tensile strength of the composites is 215 MPa, and the elongation is 12.6%. The severe plastic deformation can introduce graphene into the Mg/Al interfaces. During annealing, the microstructure and mechanical properties of the Mg/Al interface can be significantly adjusted by adding graphene to the interface. The properties of the composites are mainly derived from the improvement of matrix microstructure and interface structure.

Key words: annealing, Mg/GNSs/Al composites, laminated structure, interface evolution, mechanical properties

中图分类号:

李祎行, 张万顺, 单玲, 王紫晋, 赵红阳, 罗文博, 于智磊. 退火工艺对镁/石墨烯/铝层状复合材料组织与性能的影响[J]. 金属热处理, 2025, 50(11): 184-191.

Li Yixing, Zhang Wanshun, Shan Ling, Wang Zijin, Zhao Hongyang, Luo Wenbo, Yu Zhilei. Effect of annealing process on microstructure and properties of magnesium/graphene/aluminum laminated composites[J]. Heat Treatment of Metals, 2025, 50(11): 184-191.

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