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| 1 | NiTiAl Intermetallic Alloys Strengthened by Mo Replacement显示文摘NiTiAl based alloys have attracted attention as potential high temperature structural materials.Alloying is an effective way to improve their mechanical properties.The microstructures and mechanical properties of Ni50Ti44?xAl6Mox(x = 0,0.5,1,1.5,3) alloys have been investigated by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM) and compressive tests.It is found that Ni50Ti44?xAl6Mox alloy is composed of NiTi(B2) and Ti2Ni(FCC) phases when Mo content is no more than 1 at%.The effect of Mo solid solution hardening at room temperature has been indicated by the rise of yield strength and the fall of plasticity with increasing Mo content.For Ni50Ti42.5Al6Mo1.5 and Ni50Ti41Al6Mo3 alloys,a Mo solid solution appears and increases the yield strength by precipitation strengthening.The maximum yield strength at 600 °C and elevated temperatures is presented in Ni50Ti43Al6Mo1 alloy not in alloys with a higher Mo content,which is possibly due to the softness of Mo-Ti-Ni solid solution phase. | Song Xiaoyun | 2010 | Chinese Journal of Aeronautics2010，23，6： | 9 |
| 2 | Effect of Mo content on microstructure and stress-rupture properties of a Ni-base single crystal superalloy显示文摘The additional 1.5 wt% Mo was added in a Ni-base single crystal(SC) alloy with the composition of Ni–6.5Al–8.0Mo–2.4Cr–6.2Ta–4.9Co–1.5Re–(0.01–0.05)Y(wt%) to study the effect of Mo content on the microstructure and stress-rupture properties. The creep and stress-rupture tests under the conditions of 850 °C/500 MPa and 1100 °C/130 MPa were conducted, and the microstructure of as-cast, heat treated and stress ruptured specimens were analyzed. It was found that the 1.5 wt% Mo addition enhanced the stress-rupture lives at both intermediate(850 °C) and high(1100 °C)temperatures. The microstructure analysis showed that adding 1.5 wt% Mo in the basic alloy affected the microstructure dramatically, i.e., the Mo-rich phases formed in the specimens of as-cast and stress-ruptured specimens. It is considered that the improvement of the stress-rupture lives is duo to the strengthening effect of Mo to both γ and γ'phases and the decrease of stacking fault energy, diffusion constant and dislocation spacing. The Mo-rich phases precipitated under condition of 1100 °C/130 MPa did not affect the creep and stress-rupture properties obviously in the present study. | Yunfei Liang Shusuo Li Cheng Ai Yafang Han Shengkai Gong | 2016 | Progress in Natural Science:Materials International2016，26，1： | 5 |
| 3 | Effect of thermal exposure on the stress-rupture life and microstructure of a low Re-containing single crystal alloy显示文摘In this paper, the stress-rupture tests of a low Re-containing single crystal alloy IC21 before and after thermal exposure at 1100 ℃for various periods of time were conducted under the test condition of 1100 ℃/137 MPa, and the microstructure of the tested specimens was characterized by SEM and TEM. The experimental results showed that the stress rupture life of this alloy was over 150 h after the standard heat treatment of1320 ℃, 10 h/AC t 870, 32 h/AC, however the stress rupture life decreased with the increase of exposure time due to the microstructure degradation. The TEM analysis revealed that the interface mismatch dislocation networks were well established. It was observed that these mismatch networks could form at 1100 ℃ even after thermal exposure for 1 h without the external stress, which is quite different from that in the traditional single crystal superalloys. | Heng Zhang Yunfei Liang Yi Ru Shusuo Li Jian Zhou Shengkai Gong | 2015 | Progress in Natural Science:Materials International2015，25，1： | 4 |
| 4 | Influence of Mo and Ta additions on solidification behavior of Ni_3Al single crystal alloys显示文摘Ni3Al(Ni75Al25) and Ni3Al–2Mo/Ta(Ni73.5Al24.5Mo/Ta2) single crystals were prepared by the Bridgman method under high temperature gradient(~170℃/cm) at the withdrawal rates of 5 and 20 μm/s. The experimental results showed that the addition of Mo decreased the liquidus and solidus temperatures, and the addition of Ta increased the liquidus and solidus temperatures. Meanwhile, both Mo and Ta additions were found to increase the solidi fi cation range of experimental alloy. It has been found that for solidi fi cation of stoichiometric Ni3Al at low withdrawal rate(5 μm/s), β/γ’eutectic first solidi fied from liquid(L→β+γ’) and then β phase completely transformed into pure γ’(β→γ’) after the completion of solidi fi cation. However, at high withdrawal rate of 20 μm/s, the remaining β phase was found in the as-cast microstructure of Alloy Ni3Al. Different from stoichiometric Ni3Al, the solidi fi cation sequence of Alloy Ni3Al–2Mo was identi fi ed as L→β+γ’+Mo-rich phase(ternary eutectic reaction). In addition, the addition of Ta led to the formation of primary γ’phase and then subsequent intercellular/interdendritic β/γ’eutectic microstructure. Based on above study, a new Ta and Mo containing Ni3Al based single crystal alloy with superior tensile strength at ultra-high temperature(>1100℃) was designed. | Cheng Ai Shusuo Li Yunfei Liang Shengkai Gong | 2015 | Progress in Natural Science:Materials International2015，25，4： | 2 |
| 5 | Microstructure and Oxidation Behavior of Modified Aluminide Coating on Ni3Al-based Single Crystal Superalloy显示文摘Al, Al-Si and Cr-Al-Si coatings are prepared onto IC20 alloy by powder pack cementation to improve the oxidation resistance of the alloy. The isothermal oxidation behaviors of the coatings and the uncoated IC20 alloy at 1 100 °C are comparatively investigated. For the coatings, less weight gains are obtained compared to the uncoated alloy after 100 h thermal exposure. The Al-Si coating exhibits the best oxidation resistance, while the addition of Cr accelerates the scale spallation. Phase transformation from β-NiAl to γ and γ′ occurs in the coating after oxidation for extended periods. The oxidation protection and degradation mechanisms for these coatings are discussed. | YANG Ruibo WU Yuxiao WU Qiong LI Shusuo MA Yue GONG Shengkai | 2012 | Chinese Journal of Aeronautics2012，25，5： | 2 |
| 6 | Microstrncture evolution of NiCoCrAlY overlay coating for Ni3Al based alloy IC6turbine vane during long term engine test显示文摘 | Shusuo Li Jinxia Song Chungen Zhou | 2005 | Intermetallics2005，13，34： | 1 |
| 7 | Influence of withdrawal rate on last stage solidification path of a Mo-rich Ni 3 Al based single crystal superalloy显示文摘 | Cheng Ai Xinbao Zhao Lei Liu Heng Zhang Yi Ru Yanling Pei Jian Zhou Shusuo Li Shengkai Gong | 2015 | Journal of Alloys and Compounds2015，，： | 1 |
| 8 | Effects of temperature and stress on the creep behavior of a Ni_3Al base single crystal alloy显示文摘The creep behavior and microstructure of a Ni3Al base single crystal alloy IC6SX with [001] orientation under the testing conditions of 760 ℃/593 MPa, 980 ℃/205 MPa, and 1100 ℃/75 MPa were investigated. The experimental results showed that Alloy IC6SX had good creep resistance and its creep resistance at elevated temperatures was similar to the second generation nickel-base single crystal alloy containing Re. TEM analysis indicated that the dislocation configuration and movement pattern were different under different temperature and stress conditions. It has been found that under the test condition of 1070 ℃/137 MPa the dislocations moved within the γ channel during the primary creep stage, and the motion of dislocations were prevented by the matrix of γ′ phase, which reduced the creep rate of the alloy. In the secondary creep stage, dislocations cut into the γ′ phase from the γ/γ′ interface. However in the third creep stage, the dislocation pileups were observed in both γ and γ′ phase, and dislocation multiplication occurred when the dislocations with different Burgers vector met and reacted each other. | Zhigang Kong Shusuo Li | 2013 | Progress in Natural Science:Materials International2013，23，2： | 1 |
| 9 | Effect of Electromagnetic Stirring on Growth and Morphology of Primary Silicon Crystals of Hypereutectic Al-Si Alloys显示文摘 | Mao Weimin(毛卫民) Li Shusuo(李树索) Zhao Aimin(赵爱民) | 2001 | Materials Science and Technology(材料科学与工艺)2001，9，2： | 1 |
| 10 | Simulation of hot deformation of TiAl based alloy containing high Nb 显示文摘 | Li Shusuo Su Xikong Han Yafang Xu Xiangjun Chen Guoliang | 2005 | Intermetallics2005，13，： | 1 |
| 11 | Effect of Ru on structural stability and mechanical properties of Ni-Al-Mo-B alloy IC6显示文摘 | Xiao Chengbo Han Yafang Li Shusuo etal | 2003 | Materials Letters2003，57，： | 1 |
| 12 | Effect of Ru on structural stability and mechanical properties of Ni-Al-Mo-B alloy IC6显示文摘 | Han Yafang Li Shusuo | 2003 | Materials Letters2003，57，： | 1 |
| 13 | Surface recrystallization of a Ni_3Al based single crystal superalloy at different annealing temperatures and blasting pressure显示文摘The effects of annealing temperature and grit blasting pressure on the recrystallization behavior of a Ni3Al based single crystal superalloy were studied in this work. The results show that the precipitation of the Y-NiMo phase occurs at 900 and 1000 °C, which precedes recrystallization. The initial recrystallization temperature was between 1000 and 1100 °C. Cellular recrystallization was formed at 1100 and 1200 °C, which consisted of large columnar γ′ and fine γ + γ′. The dendrite arm closed to the interdendritic region may act as nucleation sites during initial recrystallization by a particle simulated nucleation mechanism at 1280 °C. The size of the grains first turned large and then became small upon the pressure while the recrystallization depth increased all the time. | WU Yuxiao a, YANG Ruibo a, LI Shusuo a, MA Yue a, GONG Shengkai a, and HAN Yafang a, b a Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China b Beijing Institute of Aeronautical Materials, Beijing 100095, China | 2012 | Rare Metals2012，31，3： | 1 |
| 14 | Effect of cerium on microstructures and high temperature, oxidation resistance of an Nb - Si system in - situ composite 显示文摘 | Aiqin Liu Lu Sun Shusuo Li Yafang Han | 2007 | Journal of rare earths2007，4，： | 1 |
| 15 | Effect of temperature and stress on high temperature creep behavior of Ni_(3)Al-based single crystal superalloy显示文摘The creep behavior and dislocations mechanism of the Ni_(3)Al-based single crystal alloy IC6SX with[001]orientation were investigated under the testing conditions of 1100℃/137 MPa,1100℃/120 MPa and 1070℃/137 MPa.It was observed that the temperature and stress had a significant effect on the high temperature creep life of the single crystal alloy.As the temperature was reduced from 1100℃ to 1070℃,the creep life increased from 65.07 h to 313.8 h.As the stress was reduced to 120 MPa,the creep life increased to 243.3 h.Under the high temperature and low stress condition the dislocations entered theγ0 phase by climbing caused by the atomic diffusion,instead of slipping. | Cheng Chang Liwu Jiang Meiling Wu Shusuo Li Yafang Han | 2022 | Progress in Natural Science:Materials International2022，32，2： | 0 |
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