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Effect of solution cooling rate on the microstructure and creep deformation mechanism of a rhenium-free second-generation single crystal superalloy

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Journal of Materials Science & Technology 2022年第36期131卷 14-29页

作者： xipeng tao Yunling Du Xinguang Wang Jie Meng Yizhou Zhou Jinguo Li Xiaofeng Sun Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Various cooling scenarios(water,oil,air and furnace)were employed to study the impacts of the solution cooling rate(SCR)on the microstructure and creep behavior of a novel single-crystal(SX)*** results showed that the cubic degree and size of theγphases were inversely proportional to the *** creep life first increased and then dropped dramatically with a reduction in the *** creep life of the sample cooled with air cooling(AC)was the highest,up to 144.90 h at 800℃/750 MPa and160.15 h at 1100℃/137 *** creep at 800℃/750 MPa,the improved creep life of the AC sample was mainly attributed to the fine cubicγphases,which decreased the rate ofγ-phase coarsening and favoured plastic deformation by promoting the active movement of *** AC helped theγphases become rich in Al,Ti and Ta while depleted in Co and Cr,which enhanced its stacking fault energy,thus promoting the formation of dislocation ***,the largest negative lattice misfit caused by AC induced denserγ/γinterface dislocation networks at 1100℃/137 MPa,which efficiently reduced the minimum creep *** calculated average dislocation spacing results indicated that the smallest density of excess dislocations corresponded to the AC sample,proving its greatest creep ***,the size of the secondaryγphases first decreased and then increased sharply with decreasing SCR during creep at 1100℃/137 MPa,when fine secondaryγphases had a positive role in the blockage of dislocation movement in the ***,the comprehensive SCR effect was explored to provide more guidance in the design of Re-free SX superalloys.

关键词： Solution cooling rate Microstructure Creep property Deformation mechanism Single crystal superalloy

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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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Influence of Temperatures on Creep Behavior of Pt-Al Coated Third-Generation Low-Cost Single Crystal Superalloy

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稀有金属材料与工程 2024年第10期53卷 2766-2776页

作者： Zhang Ge tao xipeng Syed Muhammad Abbas Jafri Wang Xinguang Zhang Song Zhang Chunhua Liang Jingjing Li Jinguo Sun Xiaofeng Zhou Yizhou School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The influence of applied temperatures on the creep rupture life of the third-generation low-cost single crystal(SX)superalloy with Pt-Al coating was *** creep damage was observed under the conditions of 1100℃/137 MPa,1120℃/137 MPa,and 1140℃/137 *** show that the properties of bare superalloy outperform those of coated superalloy under all test *** most significant reduction in creep life reaches 50%when the test condition is 1100℃/137 *** higher temperatures(1120 and 1140℃),the crack propagation rate in Pt-Al coatings to SX superalloy substrate decreases,thereby reducing the degradation degree of mechanical *** of the penetration into SX substrate,tip oxidation and Al diffusion of the coating cracks cause the formation of oxides,therefore leading to the slow degradation in microstructures of the substrate beneath the *** 1100℃,however,the microstructure of coating/SX superalloy substrate degrades due to the Al internal *** diffusion mechanism promotes the formation of harmful topologically close packed phases around 1100℃.At 1120 and 1140℃,the dislocation of SX superalloy substrate beneath the coating is relatively unchanged,compared to that in the inner *** contrast,the dislocation network of the substrate beneath the coating becomes sparse,and the number of superdislocations cutting intoγ′phases increases at 1100℃.

关键词： Pt-Al coating high-temperature creep single crystal superalloy crack oxidation microstructure evolution

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层错能和温度对不同Co含量的镍基高温合金蠕变性能的影响

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稀有金属材料与工程 2021年第10期50卷 3532-3537页

作者：田成刚陶稀鹏徐玲崔传勇孙晓峰中国航发商用航空发动机有限责任公司上海200241 中国科学院金属研究所高温合金部辽宁沈阳110016 中国科学技术大学材料科学与工程学院辽宁沈阳110016

研究了2种不同Co含量的镍基高温合金分别在650℃/630 MPa,725℃/630 MPa和760℃/630 MPa条件下的蠕变变形组织。通过透射电镜分析了温度和层错能对蠕变变形机制的影响。结果表明,对于所选取的高温合金来说,温度的提升可以有效促使蠕变... 详细信息

研究了2种不同Co含量的镍基高温合金分别在650℃/630 MPa,725℃/630 MPa和760℃/630 MPa条件下的蠕变变形组织。通过透射电镜分析了温度和层错能对蠕变变形机制的影响。结果表明,对于所选取的高温合金来说,温度的提升可以有效促使蠕变变形机制由层错转变为孪晶。这表明孪晶的形成更大程度上取决于温度。此外,合金Co含量的提升以及层错能的下降都会使层错和孪晶延伸并穿过γ基体和γ’析出相,该方式提升了材料的蠕变抗力以及蠕变寿命。

关键词：高温合金层错层错能孪晶

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Stability of an explicit time-integration algorithm for hybrid tests, considering stiffness hardening behavior

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 595-606页

作者： Wang tao Zhou Huimeng Zhang xipeng Ran Tianran Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsCEA

An explicit unconditionally stable algorithm for hybrid tests,which is developed from the traditional HHT-α algorithm,is *** unconditional stability is first proven by the spectral radius method for a linear *** the value of α is selected within [-0.5,0],then the algorithm is shown to be unconditionally ***,the root locus method for a discrete dynamic system is applied to analyze the stability of a nonlinear *** results show that the proposed method is conditionally stable for dynamic systems with stiffness *** improve the stability of the proposed method,the structure stiffness is then identified and *** numerical and pseudo-dynamic tests on a structure with the collision effect prove that the stiffness updating method can effectively improve stability.

关键词： explicit integration algorithm unconditional stability HHT-α algorithm stiffness identification root locus method

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Aza-BODIPY-based phototheranostic nanoagent for tissue oxygen auto-adaptive photodynamic/photothermal complementary therapy

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Nano Research 2022年第1期15卷 716-727页

作者： Meijiao Zhao Qin Zeng xipeng Li Da Xing tao Zhang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science South China Normal UniversityGuangzhou 510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China

Tumor oxygen spatial heterogeneity is a critical challenge for the photodynamic inhibition of solid *** of an intelligent nanoagent to initiate optimal therapeutics according to the localized oxygen levels is an effective ***,we report an activatable nanoagent(BDP-Oxide nanoparticles(NPs))to enable the oxygen auto-adaptive photodynamic/photothermal complementaly *** the nanoagent accumulated in the tumor region,the low extracellular pH could trigger the disassociation of the nanoagent to release the phototheranostic agent,BDP-Oxide,which will subsequently afford the fluorescence imaging-guided photodynamic oxidation after it gets into the outer oxygen-rich *** with the penetration deepening in the solid tumor,furthermore,BDP-Oxide could be reduced into BDP by the cytochrome P450(CYP450)enzymes activated in the low oxygen tension regions of inner hypoxic tumors,which will switch on the photothermal and photoacoustic ***,the BDP-Oxide NPs-enabled photodynamic/photothermal complementary therapy significantly suppressed the solid tumor growth(inhibition rate of 94.8%).This work proposes an intelligent platform to address the oxygen partial pressure for the optimization of cancer phototherapeutics.

关键词： boron dipyrromethene(BODIPY) complementary therapy self-adaptive spatial heterogeneity of oxygen

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刍议MUPS现象及对我国医学教育的启示

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中国医学伦理学 2016年第5期29卷 780-782页

作者：汪涛徐慧敏王佳陶锡鹏王毅超胡华第三军医大学心理学院重庆400038 第三军医大学新桥医院妇产科重庆400037

对用当前医学知识无法解释,患者常常自我感觉各种不确定身体不适感的症状统称MUPS,目前常常将其视为心理、精神疾病对待。从MUPS的概念和对临床诊疗的影响入手,在病因学分析及系统评估基础上,从应对措施、患者管理、医疗实践及医学教育... 详细信息

对用当前医学知识无法解释,患者常常自我感觉各种不确定身体不适感的症状统称MUPS,目前常常将其视为心理、精神疾病对待。从MUPS的概念和对临床诊疗的影响入手,在病因学分析及系统评估基础上,从应对措施、患者管理、医疗实践及医学教育等方面进行了初步探讨。

关键词：医学教育医患关系

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Implicit discourse relation detection using concatenated word embeddings and a gated relevance network

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Science China(Information Sciences) 2019年第11期62卷 195-197页

作者： Jinlan FU Qi ZHANG Jifan CHEN Minlong PENG tao GUI xipeng QIU Xuanjing HUANG Shanghai Key Laboratory of Data Science School of Computer Science Fudan University

Dear editor,Discourse relation detection involves recognizing the relationships between pairs of discourse fragments (e.g., clauses or sentences). As compared with explicit detection, implicit discourse relation detec... 详细信息

关键词： Implicit discourse relation detection using concatenated word embeddings and a gated relevance network

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Towards understanding the brittle–ductile transition in the extreme manufacturing

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International Journal of Extreme Manufacturing 2021年第2期3卷 1-21页

作者： tao Zhang Feng Jiang Hui Huang Jing Lu Yueqin Wu Zhengyi Jiang xipeng Xu National and Local Joint Engineering Research Center for Intelligent Manufacturing Technology of Brittle Material Products Xiamen 361021People’s Republic of China Institute of Manufacturing Engineering National Huaqiao UniversityXiamen 361021People’s Republic of China School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongong NSW 2522Australia

The brittle–ductile transition(BDT) widely exists in the manufacturing with extremely small deformation scale, thermally assisted machining, and high-speed machining. This paper reviews the BDT in extreme manufacturing. The factors affecting the BDT in extreme manufacturing are analyzed, including the deformation scale and deformation temperature induced brittle-to-ductile transition, and the reverse transition induced by grain size and strain rate. A discussion is arranged to explore the mechanisms of BDT and how to improve the machinability based on the BDT. It is proposed that the mutual transition between brittleness and ductility results from the competition between the occurrence of plastic deformation and the propagation of cracks. The brittleness or ductility of machined material should benefit a specific manufacturing process, which can be regulated by the deformation scale, deformation temperature and machining speed.

关键词： brittle–ductile transition deformation scale deformation temperature grain size strain rate

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基于位移型阻尼器力学模型的消能减震设计方法

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建筑结构学报 2022年第7期43卷 62-71页

作者：尚庆学张锡朋陈曦王涛中国地震局工程力学研究所黑龙江哈尔滨150080 中国地震局地震工程与工程振动部门重点实验室黑龙江哈尔滨150080 云南万科企业有限公司云南昆明650000 北京市建筑设计研究院有限公司北京100045 清华大学土木工程系北京100084

为了促进减震技术的应用,提出了一种基于位移型阻尼器力学模型和结构力学特征的消能减震设计方法。此方法避免了传统消能减震设计方法中多自由度体系与等效单自由度体系的相互转化,面向多自由度体系进行主体结构、阻尼器、连接构件一体... 详细信息

为了促进减震技术的应用,提出了一种基于位移型阻尼器力学模型和结构力学特征的消能减震设计方法。此方法避免了传统消能减震设计方法中多自由度体系与等效单自由度体系的相互转化,面向多自由度体系进行主体结构、阻尼器、连接构件一体化减震设计,与抗震设计规范和设计流程相衔接,具有较好的适用性。利用所提出的消能减震设计方法,使用墙式连接金属阻尼器,对1个8度抗震设防的4层钢筋混凝土框架原型结构进行了减震设计,得到墙式连接金属阻尼器减震结构,采用OpenSees对其进行了9度罕遇地震作用下的弹塑性时程分析,验证了所提出的减震设计方法的有效性。

关键词：框架结构消能减震减震结构金属阻尼器减震设计

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