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《材料导报》期刊社  2018, Vol. 32 Issue (10): 1663-1667    https://doi.org/10.11896/j.issn.1005-023X.2018.10.018
  材料研究 |
石墨烯纳米片/AZ91镁基复合材料的显微组织与力学性能
袁秋红,周国华,廖 琳
宜春学院物理科学与工程技术学院,宜春 336000
Microstructure and Mechanical Properties of Graphene Nanosheets Reinforced AZ91 Alloy Matrix Composite
YUAN Qiuhong, ZHOU Guohua, LIAO Lin
Physical Science and Technology College, Yichun University, Yichun 336000
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摘要 采用铸造工艺制备了石墨烯纳米片(GNPs)增强的AZ91镁基复合材料,测试了复合材料的力学性能,并利用光学显微镜、X射线衍射仪、透射电子显微镜、扫描电子显微镜和能谱仪对复合材料的微观组织、界面结合和断口形貌进行了表征和分析,讨论了复合材料的强化机理。结果表明:石墨烯纳米片可有效细化镁基体的晶粒组织,在添加少量石墨烯纳米片时(0.1%),复合材料的屈服强度、延伸率和显微硬度分别为(164±5) MPa、(7.7±0.1)%和(74.2±2)HV,比基体分别提高了37.8%、13.2%和24.7%。GNPs与镁基体形成了强界面结合,这更有利于发挥应力转移强化、细晶强化等作用,提高镁合金强度、塑性等力学性能。
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袁秋红
周国华
廖 琳
关键词:  铸造工艺  AZ91镁合金  石墨烯纳米片  复合材料  力学性能    
Abstract: Graphene nanosheets (GNPs) reinforced AZ91 alloy matrix composite was fabricated by a casting method. The mechanical properties of the composite were tested. The microstructure, interfacial bonding structure and fractographs of the as-cast composite were characterized and analyzed via optical microscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) equipped with energy-dispersive spectrometer (EDS). The strengthening mechanism of GNPs/AZ91 composite was discussed in detail. The results showed that GNPs can effectively refine the grain sized of AZ91 alloy. The yield strength, elongation and microhardness of AZ91-0.1GNPs composite was (164±5) MPa,(7.7±0.1)% and (74.2±2)HV, increasing by 37.8%,13.2% and 24.7%, respectively, compared to that of as-cast AZ91 alloy. A strong interfacial bonding between GNPs and the matrix of α-Mg have been formed, which is beneficial to the fine-grain strengthening, stress transfer strengthening and so on, resulting in a significant improvement in the tensile strength, ductility and other mechanical properties of magnesium alloy.
Key words:  casting method    AZ91 magnesium alloy    graphene nanosheets    composite    mechanical properties
               出版日期:  2018-05-25      发布日期:  2018-07-06
ZTFLH:  TG146.2+2  
  TB333  
基金资助: 国家自然科学基金(51761037);江西省教育厅科技项目
作者简介:  袁秋红:男,1981年生,博士,讲师,研究方向为纳米碳材料增强镁基复合材料 E-mail:Yuanqiuhong@126.com
引用本文:    
袁秋红,周国华,廖 琳. 石墨烯纳米片/AZ91镁基复合材料的显微组织与力学性能[J]. 《材料导报》期刊社, 2018, 32(10): 1663-1667.
YUAN Qiuhong, ZHOU Guohua, LIAO Lin. Microstructure and Mechanical Properties of Graphene Nanosheets Reinforced AZ91 Alloy Matrix Composite. Materials Reports, 2018, 32(10): 1663-1667.
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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.10.018  或          http://www.mater-rep.com/CN/Y2018/V32/I10/1663
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