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| 1 | Microstructure evolution and mechanical behavior of Ni-based single crystal superalloy joint brazed with mixed powder at elevated temperature显示文摘Brazing of a Ni-based single crystal superalloy has been investigated with the additive Ni-based superalloy and filler Ni–Cr–W–B alloy at 1260℃, and attentions were paid to the microstructure evolution during brazing and the stress-rupture behavior at 980℃ of such brazed joints after homogenization. Microstructure in the brazed joint generally includes brazing alloy zone(BAZ), isothermally solidified zone(ISZ) and diffusion affected zone(DAZ). Microstructure evolution during this brazing process is discussed at the heating stage, the holding stage and the cooling stage respectively, according to the diffusion path of B atoms. Initially well-distributed γ’/γ’ microstructure in the homogenized bonded zone after heat treatment and substantial γ’ rafts enhance the post-brazed joint to obtain a stress-rupture lifetime of more than 120 h at 980℃/250 MPa. On the other hand, the decreased stress-rupture behavior of post-brazed joint, compared with parenting material, is ascribed to the presence of inside brazing porosity and stray grain boundary, which not only reduces the effective loading-carrying area but also offers preferential sites for creep vacancy aggregation to further soften stray grain boundary. And finally an early fracture of these post-brazed joints through the intergranular microholes aggregation and growth mode under this testing condition was observed. | Guanglei Wang Yuan Sun Xinguang Wang Jide Liu Jinlai Liu Jinguo Li Jinjiang Yu Yizhou Zhou Tao Jin Xudong Sun Xiaofeng Sun | 2017 | Journal of Materials Science & Technology2017，33，10： | 2 |
| 2 | Off-axis three-mirror reflective zoom system based on freeform surface显示文摘 | Guijuan XIE Jull CHANG Ke ZHANG Jide ZHOU Yajun NIU | 2016 | Frontiers of Optoelectronics2016，9，4： | 1 |
| 3 | Influence of Ta/Al ratio on the microstructure and creep property of a Ru-containing Ni-based single-crystal superalloy显示文摘Two alloys with different Ta and Al contents were applied to study the influence of Ta/Al ratio on the microstructural evolution and creep deformation under high temperature.The increase of Ta/Al ratio made theγ/γ'lattice misfit more negative and enhanced the volume fraction ofγ'phase,which produced cubic and smallγ'phase in the initial microstructures.These initial tinyγ'phases impeded the dislocations movement and delayed the course of complete raftedγ'phase during the origination of creep deformation,which prolonged the time of the primary creep stage.Moreover,the increase of Ta/Al ratio and addition of Ru produced the denser and stable dislocation networks,the high APB energy and better solution strengthening,which hindered the climbing and sliding of dislocations,and restrained the formation of superdislocations in theγ'precipitate.The second creep stage was extended,and the minimum creep rate was reduced.Hence,the increase of whole creep life of the alloy containing high Ta/Al ratio was attributed to the prolongation of the primary and second creep stages,and the low minimum creep rate.The appearance of the topological inversion phenomenon during the tertiary creep stage was the primary cause for the sudden increase of the creep strain rate of the alloy containing low Ta/Al ratio.However,the high creep strain rate of the alloy containing high Ta/Al ratio during the tertiary creep stage was related to the occurrence and extending of the cracks near the voids.Both alloys would lose efficacy within 20 h-30 h. | Wei Song Xinguang Wang Jinguo Li Jie Meng Yanhong Yang Jinlai Liu Jide Liu Yizhou Zhou Xiaofeng Sun | 2021 | Journal of Materials Science & Technology2021，，30： | 1 |
| 4 | Evolution of TCP Phase During Long Term Thermal Exposure in Several Re-Containing Single Crystal Superalloys显示文摘The application and component designs of single crystal superalloys are restricted by the precipitation of topologically closed packed(TCP)phases,which can deteriorate the microstructural stability of the alloys severely.Limited researches concerning the type and morphology evolution of TCP phases under elevated temperature conditions have been reported previously.In the present work,three Re-containing single crystal alloys were designed to investigate TCP phase evolution via long term isothermal exposure tests at 1120℃while the effects of Re on the microstructural characteristic and elements segregation were also clarified.The results showed that the addition of Re increased the instability of the alloys and the volume fraction of the TCP phases exceeded 5 vol%when the Re content reached 3 wt%.The increasing Re content had also raised the precipitation temperature of TCP phases but it did not change the type of them after long term aging;all the TCP particles were identified asμphase in this study.Moreover,the elements segregation became considerably serious as Re addition increased constantly,which brought about various morphologies of theμphase in the experimental alloys.In particular,the rod-like and needle-likeμphases demonstrated the typical orientation withinγmatrix while the blockyμphase was dispersedly distributed in the space.No specific orientation relationship could be observed in theμphase when the addition of Re exceeded certain threshold value. | Zihao Tan Lin Yang Xinguang Wang Yunling Du Lihua Ye Guichen Hou Yanhong Yang Jinlai Liu Jide Liu Jinguo Li Yizhou Zhou Xiaofeng Sun | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，5： | 1 |
| 5 | Design of four mirror inverted telephoto zoom system显示文摘 | Jun CHANG Guijuan XIE Lifei ZHANG Yao XU Jide ZHOU Shengyi YANG | 2016 | Frontiers of Optoelectronics2016，9，4： | 0 |
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