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| 1 | Nb-Si基超高温合金研究进展显示文摘Nb-Si基超高温合金具有高熔点、低密度和良好的高温力学性能,目标使用温度达到1 200~1 450℃,有望成为新一代高推重比航空发动机热端部件最有潜力的候选材料。综述了该合金的成分设计、组织调控、性能表征及其加工制备技术,重点介绍了该合金成分-组织-性能之间的关联,探讨了定向凝固技术制备Nb-Si合金涡轮叶片存在的问题。 | 韩国明 李飞 孙宝德 | 2018 | 特种铸造及有色合金2018，38，10： | 6 |
| 2 | Microstructure evolution of eutectic Nb–24Ti–15Si–4Cr–2Al–2Hf alloy processed by directional solidification显示文摘In this work, the near-eutectic Nb–24Ti–15Si–4Cr–2Al–2Hf(at%) alloy was directionally solidified at 1900 ℃ with withdrawal rates of 6, 18, 36, 50 mm·min^(-1) and then heat-treated at 1450 ℃ for 12 h. The microstructure evolution was investigated. The results show that the microstructure of the directionally solidified(DS) alloy is composed of Nb_(ss)+Nb_5Si_3 eutectics within the whole withdrawal rate range, while the variation of rates makes a great difference on the solidification routes,the morphology and size of Nb_(ss)+Nb_5Si_3 eutectic cells.With the increase in withdrawal rates, the petaloid Nb_(ss)+Nb_5Si_3 eutectic cells transform into granular morphology. After the heat treatment, a mesh structure Nbssis formed gradually which isolates the Nb_5Si_3, and the phase boundaries become smoother in order to reduce the interfacial energy. Moreover, two kinds of Nb_5Si_3 exist in the heat-treated(HT) samples identified by crystal form and element composition, which are supposed as α-Nb_5Si_3 and γ-Nb_5Si_3, respectively. This study exhibits significant merits in guiding the optimization of Nb–Si-based alloys' mechanical properties. | Zhen Li Sai-Nan Yuan Li-Na Jia Bin Kong Zhen Hong Hu Zhang | 2017 | Rare Metals2017，36，6： | 2 |
| 3 | 热暴露对Nb-22.5Cr-0.12MgO组织及性能的影响显示文摘对机械合金化+热压制备的Nb-22.5Cr-0.12MgO合金在1200℃下分别进行了30和50h的热暴露,研究了热暴露对其组织及性能的影响。结果表明,Nb-22.5Cr-0.12MgO合金由Nb固溶体和细小、均匀分布的Laves相NbCr2构成;热暴露过程中,合金的物相稳定,室温韧性良好,但压缩强度明显下降,在1200℃热暴露50h后,其室温压缩强度下降至2655MPa,相对于热暴露前降低了18.5%,合金的热稳定性较差。 | 谢志荣 许翔 李俊 彭存财 邓莉萍 鲁世强 | 2020 | 特种铸造及有色合金2020，40，12： | 0 |
| 4 | Improvement and application of Y2O3 directional solidification crucible显示文摘In order to satisfy the drastic temperature change and high chemical activity in directional solidification of Nb–Si based alloys, Y_2O_3 crucible is demanded to possess high thermal shock resistance and erosion resistance. This paper improved the sintering degree and density of Y_2O_3 crucible by optimizing the sintering temperature and time, and its practical application performance was investigated. Y_2O_3 grains gathered with the increase of sintering temperature and time, and the contact area enlarged, resulting in the open pores being changed into closed pores.The higher density caused the improvement of erosion resistance of Y_2O_3 crucibles. However, excessive density weakened the thermal shock resistance. Considering high-temperature strength, erosion resistance, thermal shock resistance and costs, optimum sintering temperature and time of Y_2O_3 directional solidification crucible were 1800 °C and 120 min, respectively, and the porosity was20%. Improved Y_2O_3 crucible has been successfully applied to directional solidification of Nb–Si based alloys, and significantly reduced the oxygen contamination. Slight interaction occurred between Hf and Y_2O_3, but no obvious dissolution, penetration or erosion was found, showing good erosion resistance and thermal shock resistance. | Ma Limin Zhang Jiazhen Yue Guangquan Zhang Huarui Zhou Li Zhang Hu | 2016 | Chinese Journal of Aeronautics2016，29，2： | 0 |
| 5 | High-temperature oxidation behavior of Nb-Si-based alloy with separate vanadium,tantalum,tungsten and zirconium addition显示文摘The microstructure and oxidation behavior of directionally solidified(DS) Nb-15 Si-24 Ti-4 Cr-2 Al-2 Hf 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)_(5) S_(3) structure.After oxidation at 1250℃ for 100 h in air,the surfaces of the five alloys are covered by the oxides of Nb_(2)O_(5),TiNb_(2) O_(7),Ti_(2) Nb10O29,TiO_(2) and amorphous SiO_(2).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 to184.83 mg·cm^(-2).The oxidation mechanism of Nb-Sibased alloys and the effects of different alloying elements on the oxidation resistance of Nb-Si-based alloys were discussed. | Sheng-Nan Zhang Li-Na Jia Yue-Ling Guo Bin Kong Feng-Xiang Zhang Hu Zhang | 2021 | Rare Metals2021，40，3： | 0 |
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