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Influence of Ta/Al ratio on the microstructure and creep property of a Ru-containing Ni-based single-crystal superalloy

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Journal of Materials Science & Technology 2021年第30期89卷 16-23页

作者： Wei Song Xinguang Wang Jinguo Li Jie Meng Yanhong Yang Jinlai Liu Jide Liu yizhou Zhou Xiaofeng sun Shi-changxu Innovation Center for Advanced Materials Superalloys DivisionInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

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 *** 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 *** 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 ***,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'*** second creep stage was extended,and the minimum creep rate was ***,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 *** 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 ***,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 *** alloys would lose efficacy within 20 h-30 h.

关键词： Ni-based superalloys Ta/Al ratio High temperature creep Interfacial dislocation networks γ'rafting

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Effect of solid solution elements on cracking susceptibility of Ni-based superalloys during additive manufacturing

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Journal of Materials Science & Technology 2024年第23期190卷 218-228页

作者： Xue Zhang Yahang Mu Nannan Lu Qi Li Shaofeng Chen yizhou Zhou Xiaofeng sun Jingjing Liang Jinguo Li School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

Alloy composition design usually contributes to eliminating cracking in Ni-based superalloys during addi-tive manufacturing(AM).However,a detailed understanding of each solid solution element in the crack-ing susceptibility of Ni-based superalloys during AM is still *** newly designed alloys are considered to investigate the combined effect of solid solution elements on cracking *** behaviors of solidification cracking,liquation cracking,and solid-state cracking were analyzed by the microstructural characterization and thermodynamic *** results showed that W and Mo cause the formation of high melting-point carbides at grain boundaries(GBs),which increase solidifica-tion cracking ***,W and Mo lead to a slightly higher solidification cracking index(SCI)compared to Co,Cr,and *** the successive solidification and remelting process,the borides en-riched in W,Mo,and B around GBs will cause grain boundary segregation and liquation cracking.W and Re extend the freezing range(FR)and exacerbate the segregation of Al and Ti in the inter-dendritic re-gions,contributing to the formation of ***,complete or partial melting of the eutectic can induce liquation cracking during the thermal cycling in *** solid-state cracking susceptibility can be reduced by solid solution elements,especially Re and *** summary,compared to Co,Cr,and Re,W and Mo exacerbate the cracking susceptibility.

关键词： Additive manufacturing Ni-based superalloys Cracking susceptibility Solid solution elements

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Balancing flexural strength and porosity in DLP-3D printing Al_(2)O_(3)cores for hollow turbine blades

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Journal of Materials Science & Technology 2022年第9期104卷 19-32页

作者： Qiaolei Li Xiaolong An Jingjing Liang Yongsheng Liu Kehui Hu Zhigang Lu Xinyan Yue Jinguo Li yizhou Zhou Xiaofeng sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Space Manufacturing Technology(CAS Key Lab) Beijing 100094China NPU-SAS Joint Research Center of Advanced Ceramics Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

High porosity and high strength are usually mutually exclusive in the preparation of ceramic ***,high porosity and flexural strength are required for the preparation of complex ceramic cores for hollow turbine *** this study,Al_(2)O_(3)cores with high porosity and high flexural strength were successfully prepared using digital light processing(DLP)3 D printing *** influence of sintering temperature on the microstructure,pore evolution,and flexural strength of the cores were *** an increase in the sintering temperature,the porosity of the ceramic cores first increased and then decreased,reaching a maximum value of 35%at 1400℃.The flexural strength increased with the increase in sintering temperature,but at 1400℃the incremental enhancement of flexural strength was *** with the core service requirements and core performance,this study selected 1400℃(open porosity of 35.1%and flexural strength of 20.3 MPa)as the optimal sintering temperature for the DLP-3 D printed Al_(2)O_(3)core.

关键词： 3D printing Ceramic cores Flexural strength Porosity Sintering temperature

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Influence of Substituting W for Nb or Hf on Solidification Behavior of a Typical Co-Ni-Al-W Based Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1907-1920页

作者： Huifang Zhang Jun Xie Qi Li Hao Wu Jinjiang Yu Hongyu Chai Fengjiang Zhang Jinguo Li yizhou Zhou Xiaofeng sun Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

Understanding the effects of various elements on solidification behavior is crucial for designing the composition ofγ’-strengthened Co-based superalloys and is fundamental for controlling the as-cast structure and formulating subsequent heat treatment *** research investigated the effects of replacing 1 at.%W with 1 at.%Nb or Hf elements on the solidification behavior of Co-Ni-Al-W-based *** findings revealed that substituting W with Nb and Hf resulted in a notable decrease in both the solidus temperature(TS)and liquidus temperature(TL).Specifically,the substitution of W with Nb lowered TS from 1353℃ to 1332℃ and TL from 1383℃ to 1368℃,while replacing W with Hf decreased TS from 1353℃ to 1330℃ and TL from 1383℃ to 1366℃.Moreover,both Nb and Hf element are positive segregation element,while Nb decreases and Hf increases W segregation,*** the final solidification stage,the substitution of W with Nb resulted in the formation of eutectic(γ+γ’),Co_(3)Ta,and a small amount ofμ-Co7Nb6 phase,while replacing W with Hf resulted in the formation of the Laves phase andβ-CoAl *** solidification paths of the three alloys were confirmed based on the result of differential scanning calorimetry,isothermal solidification experiment and Thermo-calc *** results offer a theoretical basis for the composition design and optimization of heat treatment processes for Co-Ni-Al-W-based superalloys.

关键词： Co-Ni-Al-W-based superalloys Solidification microstructure Segregation Solidification path

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Effect of Ta on Tensile Behavior and Deformation Mechanism of a Nickel-Based Single Crystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1921-1934页

作者： Mingtao Ge Xinguang Wang Yongmei Li Zihao Tan Xipeng Tao Yanhong Yang Liang Wang Chunhua Zhang Song Zhang yizhou Zhou Xiaofeng sun Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China

The effects of Ta on the tensile behavior and deformation mechanisms of a Ni-based single crystal superalloy were investigated in this study from room temperature to elevated *** findings demonstrated that the higher content of Ta could improve the tensile properties of the alloy at different *** to the different deformation mechanisms at various temperatures,the influence of Ta on tensile deformation *** room temperature,the higher content of Ta enhanced the solid solution strengthening,which would enhance the tensile strength of 6.5Ta *** standard heat treatment of 6.5Ta alloy,precipitation of the secondaryγʹphase would hinder the movement of *** the temperature was elevated to 760℃,the higher content of Ta not only promoted the interaction of stacking faults to form Lomer-Cottrell(L-C)locks that impeded dislocation motion,but also reduced the occurrence of dislocation pile-up groups,thus enhancing the yield *** 1120℃,due to the narrowerγchannels and higher APB energy inγʹphase of the alloy with higher Ta addition,the processes of bypassing and shearing of dislocations were hindered,***,the denser and more regular dislocation networks were formed in 6.5Ta alloy;and thus,the tensile strength of 6.5Ta alloy was *** study systematically investigated the effect of Ta on the tensile behavior at three different temperatures,which provided an important theoretical basis for the design of nickel-based single crystal superalloys in the future.

关键词： Ta Single crystal superalloy Tensile behavior Stacking fault Deformation mechanism

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Evolution of TCP Phase During Long Term Thermal Exposure in Several Re-Containing Single Crystal Superalloys

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 731-740页

作者： Zihao Tan Lin Yang Xinguang Wang Yunling Du Lihua Ye Guichen Hou Yanhong Yang Jinlai Liu Jide Liu Jinguo Li yizhou Zhou Xiaofeng sun School of Materials Science and Engineering Shenyang University of Technology111 Shenliao RoadShenyang 110870China Superalloys Division Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

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 *** researches concerning the type and morphology evolution of TCP phases under elevated temperature conditions have been reported *** 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 *** 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 ***,the elements segregation became considerably serious as Re addition increased constantly,which brought about various morphologies of theμphase in the experimental *** particular,the rod-like and needle-likeμphases demonstrated the typical orientation withinγmatrix while the blockyμphase was dispersedly distributed in the *** specific orientation relationship could be observed in theμphase when the addition of Re exceeded certain threshold value.

关键词： Single crystal superalloys Topologically closed packed(TCP)phase Re Elements segregation Morphology

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Comparative study on Photobiomodulation between 630 nm and 810 nm LED in diabetic wound healing both in vitro and in vivo

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Journal of Innovative Optical Health Sciences 2022年第2期15卷 58-67页

作者： Hongyou Zhao Tengda Ji Tianzhen sun Haolin Liu Yidi Liu Defu Chen Ying Wang yizhou Tan Jing Zeng Haixia Qiu Ying Gu Department of Laser Medicine The First Medical Centre Chinese PLA General Hospital Beijing 100853P.R.China Institute of Engineering Medicine Beijing Institute of Technology Beijing 100081P.R.China Precision Laser Medical Diagnosis and Treatment Innovation Unit Chinese Academy of Medical Sciences Beijing 100000P.R.China Medical School of Chinese PLA Beijing 100853P.R.China

Photobiomodulation(PBM)promoting wound healing has been demonstrated by many ***,630 nm and 810 nm light-emitting diodes(LEDs),as light sources,are frequently used in the treatment of diabetic foot ulcers(DFUs)in ***,the dose-effect relationship of LED-mediated PBM is not fully ***,among the 630 nm and 810 nm LEDs,which one gets a better effect on accelerating the wound healing of diabetic ulcers is not *** aim of this study is to evaluate and compare the effects of 630 nm and 810 nm LED-mediated PBM in wound healing both in vitro and in *** results showed that both 630 nm and 810 nm LED irradiation significantly promoted the proliferation of mouse fibroblast cells(L929)at different light irradiances(1,5,and 10 mW/cm^(2)).The cell proliferation rate increased with the extension of irradiation time(100,200,and 500 s),but it decreased when the irradiation time was over 500 *** 630 nm and 810nm LED irradiation(5 mW/cm^(2))significantly improved the migration capability of L929 *** difference between 630 nm and 810 nm LED-mediated PBM in promoting cell proliferation and migration was *** vivo results presented that both 630 nm and 810 nm LED irradiation promoted the wound healing and the expression of the vascular endothelial growth factor(VEGF)and transforming growth factor(TGF)in the wounded skin of type 2 diabetic ***,these results suggested that LED-mediated PBM promotes wound healing of diabetic mice through promoting fibroblast cell proliferation,migration,and the expression of growth factors in the wounded ***(630 nm and 810 nm)have a similar outcome in promoting wound healing of type 2 diabetic mice.

关键词： Photobiomodulation(PBM) light-emitting diode(LED) wound healing diabetic ulcers

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Highly stable carbon-coated nZVI composite Fe0@RF-C for efficient degradation of emerging contaminants

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Environmental Science and Ecotechnology 2024年第6期22卷 233-244页

作者： Guizhou Xu Lin sun yizhou Tu Xiaolei Teng Yumeng Qi Yaoyao Wang Aimin Li Xianchuan Xie Xueyuan Gu State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing210023China Key Laboratory of Poyang Lake Environment and Resource Utilization Engineering Research Center of Watershed Carbon NeutralizationMinistry of EducationSchool of Resource and EnvironmentNanchang UniversityNanchang330031China Nanjing University&Yancheng Academy of Environment Protection Technology and Engineering Nanjing210023China Jiangxi Nanxin Environmental Protection Technology Co.LTD Jiujiang CityJiangxi Province330300China

Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and *** nZVI with carbon can effectively addresses these issues.A simple and scalable production method for carbon-coated nZVI composite is highly *** anti-oxidation and catalytic performance of carbon-coated nZVI composite merit in-depth *** this study,a highly stable carbon-coated core-shell nZVI composite(Fe0@RF-C)was successfully prepared using a simple method combining phenolic resin embedding and carbothermal ***0@RF-C was employed as a heterogeneous persulfate(PS)activator for degrading 2,4-dihydroxybenzophenone(BP-1),an emerging *** to commercial nZVI,Fe0@RF-C exhibited superior PS activation performance and oxidation *** 95%of BP-1 was removed within 10 min in the Fe0@RF-C/PS *** carbon layer promotes the enrichment of BP-1 and accelerates its degradation through singlet oxygen oxidation and direct electron transfer *** study provides a straightforward approach for designing highly stable carbon-coated nZVI composite and elucidates the enhanced catalytic performance mechanism by carbon layers.

关键词： Nanoscale zerovalent iron Carbon-coated nZVI Persulfate BP-1 Enhanced degradation

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Amelioration of weld-crack resistance of the M951 superalloy by engineering grain boundaries

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Journal of Materials Science & Technology 2021年第19期78卷 260-267页

作者： Mingyue Wen Yuan sun Jinjiang Yu Shulin Yang Xingyu Hou Yanhong Yang Xiaofeng sun Yi Zhou Zhou Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research.Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering.University of Science and Technology of China Shenyang110016China Shenyang Liming Aeroengine Cooperation Ltd Shenyang110043China

Fusion weld is a portable and economical joining and repairing method of ***,weld cracks often occur during the fusion weld of Ni-base superalloys,which hinder the applications of fusion weld on this kind of *** this work,the effects of microstructures of grain boundaries(GBs)of the prototype M951 superalloy on its weldability were *** precipitated phases,the elemental segregations on GBs,and the morphologies of GBs can be largely altered by regulating the cooling rates of pre-weld heat *** decreasing the cooling rate,chain-like M_(23)X_(6)phase precipitates along the GBs,accompanying segregations of B,and GBs becomes more serrated in *** fusion weld,the engineered GBs in the M951 superalloy with a low cooling rate favor the formation of the continuous liquid films on GBs,which together with the serrated GB morphology significantly prevents the formation of weld *** findings imply that the weld-crack resistance of the superalloys can be ameliorated by engineering GBs.

关键词： Fusion weld Superalloys M951 Weld-crack resistance Grain boundary engineering

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Neuro-bone tissue engineering:emerging mechanisms,potential strategies,and current challenges

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Bone Research 2023年第4期11卷 695-720页

作者： Wenzhe sun Bing Ye Siyue Chen Lian Zeng Hongwei Lu yizhou Wan Qing Gao Kaifang Chen Yanzhen Qu Bin Wu Xiao Lv Xiaodong Guo Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina School of Basic Medicine Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

The skeleton is a highly innervated organ in which nerve fibers interact with various skeletal *** nerve endings release neurogenic factors and sense skeletal signals,which mediate bone metabolism and skeletal *** recent years,bone tissue engineering has increasingly focused on the effects of the nervous system on bone *** regeneration of bone and nerves through the use of materials or by the enhancement of endogenous neurogenic repair signals has been proven to promote functional bone ***,emerging information on the mechanisms of skeletal interoception and the central nervous system regulation of bone homeostasis provide an opportunity for advancing ***,comprehensive reviews of this topic are ***,this review provides an overview of the relationship between nerves and bone regeneration,focusing on tissue engineering *** discuss novel regulatory mechanisms and explore innovative approaches based on nerve–bone interactions for bone ***,the challenges and future prospects of this field are briefly discussed.

关键词： metabolism mechanisms skeleton

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