【摘要】：高熵合金以其獨特的結(jié)構(gòu)和優(yōu)異的性能備受國內(nèi)外學(xué)者關(guān)注與研究。本文采用非自耗電弧熔煉爐熔煉制備了AlxFe Cr Co Cu Ti(x=0,0.5,1.0,1.5,2.0,2.5)6組合金,用X射線衍射(XRD)、掃描電鏡(SEM)、能譜分析(EDS)、差示掃描量熱法(DSC)和熱重分析(TG)等技術(shù)探究了不同Al元素對合金組織結(jié)構(gòu)、成相規(guī)律、硬度及高溫氧化性能的影響。研究發(fā)現(xiàn),6組合金都是典型的樹枝晶結(jié)構(gòu),合金組織成分偏析嚴(yán)重,Cu元素大量聚集在晶間,并且晶間存在著大量的富Al納米級顆粒。合金具有較強的硬度,其硬度與組織結(jié)構(gòu)密切相關(guān),Al的加入可以提高合金的硬度。TG實驗表明,合金具有很強的抗高溫氧化能力,加熱到800℃以前質(zhì)量幾乎保持不變,Al元素的增加可以有效提高合金的抗高溫氧化能力,它們隨Al含量的增加而增強。
[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，

本文編號：2323467