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| 碳纳米管和石墨烯纳米片复合增强AZ91镁基复合材料组织与力学性能 |
| Microstructure and Mechanical Properties of AZ91 Alloy Reinforced by Carbon Nanotubes and Graphene Nanosheets |
| Received:June 29, 2020 Revised:September 10, 2020 |
| DOI：10.3969/j.issn.1674-6457.2020.05.004 |
| 中文关键词: 镁基复合材料 碳纳米管 石墨烯纳米片 微观组织 力学性能 |
| 英文关键词: magnesium matrix composites carbon nanotues graphene nanosheets microstructure mechanical properties |
| 基金项目:国家自然科学基金（52061039，51761037）；江西省自然科学基金（20202BABL204002）；江西省教育厅科技项目（GJJ180851，GJJ180836）；上海交通大学优秀访问学者基金 |
| Author Name | Affiliation | | YUAN Qiu-hong | 1. Physical Science and Technology College, Yichun University, Yichun 336000, China
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | LIU Yong | 3. Mechatronic Engineering School, Nanchang University, Nanchang 330031, China | | ZHOU Guo-hua | 1. Physical Science and Technology College, Yichun University, Yichun 336000, China | | LI Qing-yu | 1. Physical Science and Technology College, Yichun University, Yichun 336000, China | | LI Shi-jie | 2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | ZENG Xiao-qin | 2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 中文摘要: |
| 目的 解决纳米碳材料在镁基体中分散难的瓶颈问题，制备出力学性能优异的镁合金复合材料。方法 采用超声工艺将质量分数为3.0%的碳纳米管插入到质量分数为0.5%的石墨烯纳米片的片层之间，添加到AZ91镁合金基体中，借助粉末冶金技术+热挤压工艺制备了0.5%GNS+3.0%CNTs复合增强的镁基复合材料。采用光学显微镜和透射电子显微镜观察和分析了复合材料的显微组织和界面结合。测试了复合材料的力学性能，并利用扫描电子显微镜观察了复合材料的拉伸断口形貌。结果 复合材料的屈服强度、伸长率和显微硬度分别为（274±5.0）MPa，（8.4±0.2）%，HV（90.5±1.8），与基体合金相比，分别提高了63.1%，20.0%，20.1%。结论 GNS+CNTs的加入有效细化了基体合金的晶粒组织，且与镁基体形成了较好的界面结合，促使细晶强化、应力转移强化等各种强化机制的共同作用，使复合材料力学性能显著提高。 |
| 英文摘要: |
| This work aims to solve the bottleneck problem of the dispersion of nano-carbon materials in magnesium matrix and fabricate the magnesium matrix composite with excellent mechanical properties. Carbon nanotubes (carbon nanotubes, CNTs) were inserted between the graphene nanosheets (graphene nanosheets, GNS) with ultrasonic technology, and then filled into the AZ91 alloy matrix to synthesize the Mg matrix composite reinforced with CNTs and GNS by powder technique with following hot extrusion. The microstructure and interfacial bonding were characterized via the optical microscope and transmission electron microscope. The mechanical properties of the composites were tested. The fractographs were observed and analyzed via scanning electron microscope equipped. The results showed that the yield strength, elongation and microhardness of the composite reached (274±5.0) MPa, (8.4±0.2)% and HV(90.5±1.8), increasing by 63.1%, 20% and 20.1%, respectively, compared with those of AZ91 alloy. The high mechanical property of the composite is mainly due to the grains refinement, load transfer, thermal residual stress, etc. which resulted from the addition of GNS+CNTs in the matrix alloy and the formation of interfacial bonding with magnesium matrix. |
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