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镁基复合材料挤压铸造制备技术研究
Researchon Squeeze Casting Preparation Technology for Magnesium Matrix Composite Materials
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- DOI:
- 作者:
- 陈利文 1，李佳成 1，赵 源 1，景舰辉 1，樊如意 1，侯 华 1，2，赵宇宏 1，3，4
CHEN Liwen1, LI Jiacheng1, ZHAO Yuan1, JING Jianhui1, FAN Ruyi1, HOU Hua1,2, ZHAO Yuhong1,3,4
- 作者单位:
- 1. 中北大学 材料科学与工程学院 教育部共建高性能铝/镁合金材料开发应用协同创新中心，新材料智能铸造先进成型 山西省重点实验室，山西 太原 030051；2. 太原科技大学 材料科学与工程学院，山西 太原 030024；3. 北京科技大学 北京 材料基因工程高精尖创新中心，北京 100083；4. 辽宁材料实验室 材料智能技术研究所，辽宁 沈阳 110167
1. Shanxi Key Laboratory of Intelligent Casting and Advanced Forming for New Materials, MOE Jointly Collaborative Innovation Center for High-performance Al/Mg based Materials, School of Materials Science and Engineering , North University of China, Taiyuan 030051, China; 2. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 3. Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; 4. Institute of Materials Intelligent Technology, Liaoning Academy of Materials, Shenyang 110167, China
- 关键词:
- 氧化石墨烯；镁基复合材料；表面处理；挤压铸造；细化晶粒
graphene oxide; magnesium matrix composite; surface treatment; squeeze casting; grain refinement
- 摘要:
- 镁基复合材料具有优异的性能，但制备工艺上仍存在着不足之处。 为此，通过分子模拟与实验相结合的方法，系统研究了氧化石墨烯(GO)增强 ZM5 镁基复合材料的界面特性、微观组织及力学性能。 计算结果表明，经 PVA 表面处理后的 GO/PVA-Al 界面结合能显著高于未处理的 GO/Al 界面， 表明表面处理法制备的增强体可有效增强界面结合，有助于提升复合材料整体性能。 微观组织分析显示，添加 0.3%(质量分数)GO 并挤压铸造后，复合材料中 α-Mg 基体由树枝晶转变为等轴晶，晶粒显著细化，β-Mg17Al12 第二相析出减少且分布更均匀。 与基体合金相比，GO/ZM5 复合材料的硬度提高了 23.1%，抗拉强度提升了 8.1%，断口形貌由脆性断裂转变为韧性断裂。 研究表明，GO 的添加通过细化晶粒和改善界面结合，显著增强了 ZM5 镁基复合材料的综合力学性能。Magnesium matrix composites exhibit outstanding properties, yet their fabrication processes remain imperfect. To address this, the interfacial characteristics, microstructures, and mechanical properties of graphene oxide (GO)-reinforced ZM5 magnesium matrix composites were systematically investigated through a combined molecular simulation and experimental approach. The calculations indicate that the bond energy of the GO/PVA-Al interface significantly exceeds that of the untreated GO/Al interfaces following PVA surface treatment. This demonstrates that surface-treated reinforcements effectively enhance interfacial bonding, thereby improving the overall composite performance. Microstructural analysis reveals that after adding 0.3 wt.% GO and undergoing squeeze-casting, the α-Mg matrix transforms from dendritic to equiaxed grains, with significant grain refinement. The precipitation of the β-Mg17Al12 second phase decreases and becomes more uniformly distributed. Compared with the matrix alloy, the GO/ZM5 composite exhibits a 23.1% increase in hardness and an 8.1% improvement in tensile strength, with the fracture morphology shifting from brittle to ductile fracture. This study demonstrates that the addition of GO significantly enhances the comprehensive mechanical properties of the ZM5 magnesium matrix composites by refining the grains and improving interfacial bonding.