添加Al对Al_xFeCrCoCuTi高熵合金组织与高温氧化性能的影响
发布时间：2018-11-10 20:01
【摘要】：高熵合金以其独特的结构和优异的性能备受国内外学者关注与研究。本文采用非自耗电弧熔炼炉熔炼制备了AlxFe Cr Co Cu Ti(x=0,0.5,1.0,1.5,2.0,2.5)6组合金,用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)、差示扫描量热法(DSC)和热重分析(TG)等技术探究了不同Al元素对合金组织结构、成相规律、硬度及高温氧化性能的影响。研究发现,6组合金都是典型的树枝晶结构,合金组织成分偏析严重,Cu元素大量聚集在晶间,并且晶间存在着大量的富Al纳米级颗粒。合金具有较强的硬度,其硬度与组织结构密切相关,Al的加入可以提高合金的硬度。TG实验表明,合金具有很强的抗高温氧化能力,加热到800℃以前质量几乎保持不变,Al元素的增加可以有效提高合金的抗高温氧化能力,它们随Al含量的增加而增强。
[Abstract]:High entropy alloys have attracted much attention of scholars at home and abroad for their unique structure and excellent properties. In this paper, AlxFe Cr Co Cu Ti (_ XO _ (0. 5) 1. 0 ~ (2. 5) ~ (2. 5) gold was prepared in a non consumable arc smelting furnace. The (EDS), was analyzed by X-ray diffraction (XRD),) scanning electron microscope (SEM),) and X-ray diffraction (XRD),) scanning electron microscope (SEM),). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) techniques were used to investigate the effects of different Al elements on the microstructure, phase formation, hardness and oxidation properties of the alloy at high temperature. It is found that all the 6 gold combinations are typical dendritic structure, the microstructure of the alloy is segregated seriously, the Cu element is accumulated in the intergranular mass, and there are a large number of Al rich nanocrystalline particles in the intergranular structure. The hardness of the alloy is closely related to its microstructure. The addition of Al can improve the hardness of the alloy. The TG experiment shows that the alloy has a strong oxidation resistance at high temperature and the mass remains almost unchanged before heating to 800 鈩，
本文编号：2323467
[Abstract]:High entropy alloys have attracted much attention of scholars at home and abroad for their unique structure and excellent properties. In this paper, AlxFe Cr Co Cu Ti (_ XO _ (0. 5) 1. 0 ~ (2. 5) ~ (2. 5) gold was prepared in a non consumable arc smelting furnace. The (EDS), was analyzed by X-ray diffraction (XRD),) scanning electron microscope (SEM),) and X-ray diffraction (XRD),) scanning electron microscope (SEM),). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) techniques were used to investigate the effects of different Al elements on the microstructure, phase formation, hardness and oxidation properties of the alloy at high temperature. It is found that all the 6 gold combinations are typical dendritic structure, the microstructure of the alloy is segregated seriously, the Cu element is accumulated in the intergranular mass, and there are a large number of Al rich nanocrystalline particles in the intergranular structure. The hardness of the alloy is closely related to its microstructure. The addition of Al can improve the hardness of the alloy. The TG experiment shows that the alloy has a strong oxidation resistance at high temperature and the mass remains almost unchanged before heating to 800 鈩，
本文编号：2323467
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