引用本文: | 刘芳,崔力立,肖菲.石墨烯增强铝基复合材料的制备及热变形研究[J].材料科学与工艺,2022,30(2):9-15.DOI:10.11951/j.issn.1005-0299.20210300. |
| LIU Fang,CUI Lili,XIAO Fei.Preparation and hot deformation behavior of graphene-reinforced aluminum matrix composites[J].Materials Science and Technology,2022,30(2):9-15.DOI:10.11951/j.issn.1005-0299.20210300. |
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摘要: |
为了探究石墨烯增强铝基复合材料的制备工艺及其热变形行为,本文采用湿混球磨结合真空热压烧结法制备了0.5wt.%石墨烯增强铝基复合材料,并利用场发射扫描电子显微镜、能谱仪和X射线衍射仪对其进行微观组织观察、成分和物相分析,用Gleeble 3800热模拟机对复合材料进行等温压缩试验,建立了材料的本构方程并分析其热变形机理。试验结果表明,采用粉末冶金法制备的石墨烯增强铝基复合材料,基体和增强相未发生明显的界面反应,在热变形过程中呈现稳态流变特征,其软化机制以动态回复为主。基于Arrhenius双曲正弦模型建立了该材料的本构方程,计算得到应力指数n=5.503 765,表明材料的变形机制为位错攀移;热变激活能Q为130.43 kJ/mol,相比其他的碳基增强体(碳纳米管、碳纤维)更低,表明材料在热变形时克服变形抗力所需要的能量越低,则更易于复合材料的塑性成形加工。 |
关键词: 石墨烯增强 铝基复合材料 粉末冶金法 热变形行为 热变激活能 |
DOI:10.11951/j.issn.1005-0299.20210300 |
分类号:TG379 |
文献标识码:A |
基金项目:国家自然科学基金资助项目(51771120,51304136). |
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Preparation and hot deformation behavior of graphene-reinforced aluminum matrix composites |
LIU Fang, CUI Lili, XIAO Fei
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(School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China)
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Abstract: |
To investigate the preparation process of graphene-reinforced aluminum matrix composites and their hot deformation behavior, 0.5wt.% graphene-reinforced aluminum matrix composites were prepared by wet-mix ball milling combined with vacuum hot-press sintering method.The microstructure observation and composition and phase analysis of the composites were performed by using field emission Scanning Electron Microscope (SEM), Energy Spectrometer (EDS), and X-ray Diffractometer (XRD).Isothermal compression tests were conducted on the composites by using a Gleeble 3800 thermal simulator.The constitutive equation of the material was established, and the hot deformation mechanism was analyzed.Test results showed that for the graphene-reinforced aluminum matrix composites prepared by powder metallurgy method,there was no obvious interfacial reactions between the matrix and the reinforcement.The composites showed steady-state flow characteristics during the hot deformation process, and the softening mechanism was dominated by dynamic recovery. Based on the Arrhenius hyperbolic sine model, the constitutive equation of the material was established, and the calculated stress index n was 5.503 765,which showed that the deformation mechanism of the material was dislocation climbing.The calculated hot deformation activation energy (Q=130.43 kJ/mol)of the material was lower than other carbon-based reinforcements (carbon nanotubes, carbon fibers), which showed that the material required lower energy to overcome the deformation resistance during the hot deformation process, making it easier for plastic forming. |
Key words: graphene-reinforced aluminum matrix composites powder metallurgy hot deformation behavior hot deformation activation energy |