【摘 要】
：
The microstructure and oxidation behavior of directionally solidified (DS) Nb-15Si-24Ti-4Cr-2Al-2Hf alloys with separate vanadium,tantalum,tungsten and zirconiu
【机 构】
：
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
论文部分内容阅读
The microstructure and oxidation behavior of directionally solidified (DS) Nb-15Si-24Ti-4Cr-2Al-2Hf alloys with separate vanadium,tantalum,tungsten and zirconium additions were investigated by X-ray diffraction (XRD),electron probe microanalyzer (EPMA) equipped with wave-dispersive spectroscopy (WDS),scanning electron microscopy (SEM) and transmission electron microscopy (TEM) equipped with an energy-dispersive spectroscopy (EDS).Results show that the five alloys are all composed of primary (Nb,Ti) solid solution ((Nb,Ti)SS) phase and eutectic (Nb,Ti)SS/(Nb,Ti)5Si3 structure.After oxidation at 1250 ℃ for 100 h in air,the surfaces of the five alloys are covered by the oxides of Nb2O5,TiNb2O7,Ti2Nb10O29,TiO2 and amorphous SiO2.It is found that the alloying elements of V and W are detrimental for oxidation resistance and the addition of Ta has no obvious effect.Zr addition obviously benefits the oxidation resistance at high temperature,by decreasing the weight gain from 242.75 to 184.83 mg·cm-2.The oxidation mechanism of Nb-Si-based alloys and the effects of different alloying elements on the oxidation resistance of Nb-Si-based alloys were discussed.
其他文献
This work presents the electronic behavior of Ti and TiN thin films when exposed to electrolytes with pH levels of 2,7 and 13 for 90 days.Staircase potentio-ele
弹跳力是指人体腾起离开地面垂直向上或向前的一种能力,它是全身力量、速度、身体协调性、柔韧性和灵活性的综合体现。对于许多运动项目,特别是田径跳跃项目而言,弹跳力是一
2010年12月21日,世界顶级高尔夫球具品牌日本HONMA专卖店落户上海,当天在古北及佘山球场相继举行了盛大的开幕典礼,日本本间高尔夫有限公司董事长刘建国、社长西谷浩司及HONM
The modified graphite anode materials have some prominent advantages over other anode materials in the industrial applications.A novel simple and gentle method
The thermal oxide layer formed of TA 15 alloy has poor corrosion resistance.In this paper,the changes of the elements and components on the surface after laser
A new strategy to chemically synthesize exchange-coupled SmCo5/Sm2Co17 nanocomposites by in situ decomposition of SmCox (5 ＜ x ＜ 8.5) is reported in this work.Our
长久以来，我们都习惯了在平面的显示器上玩游戏。若有一款软件，可以把游戏变成3D游戏的话—试想一下，躲子弹时掩体近得几乎可以贴到脸、转弯漂移时你甚至能感受到车头离墙壁有多少距离—所有一切都变得一目了然，临场感和代入感前所未有地提高，尤为难得的是没有特殊硬件需求，普通家用配置就可以实现，你难道不想试试？ 软件初设 我们所要用到的软件为“iZ3D”，下载地址见其官方网站http://www.iz
Magnetic field annealing (MFA) was used to tailor the magnetostriction and magnetic domains of Fe80Ga16Al4 alloy,and the relationship between the two characteri
In this work,Eu(Ⅲ)-based coordination polymer (EuCP) nanosheets were successfully synthesized using tetrabutylammonium bromide (TBAB) as low-temperature molten
The deformation behavior involved in Nb/NiTi composite for biomedical applications within a large macroscopic strain range was investigated by tensile loading-u