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High-Speed Rubbing Behavior of Abrasive Coating Coated on Titanium Alloy Blade Tips

Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 749-762页

作者： Wenshuang Gu Shuai Yang Shiyi Zhang Zhiliang Pei Weihai Xue Deli Duan Jun Gong Chao 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 ChinaShenyang110016China

In aero-engines, abrasive coatings are typically utilized to protect the blade tip from excessive wear caused by the harder abradable sealing coating and thereby improve the sealing performance of engines. Therefore, a Ni/cBN abrasive coating was prepared on titanium alloy using electrodeposition. The high-speed rubbing tests with a linear velocity of 350 m/s and different incursion rates were performed to investigate the effect of the Ni/cBN abrasive coating on the wear behavior against NiCrAl/diatomite seal coating. Results showed that melting wear and adhesive transfer occurred on the bare blades, causing the bare blade to suffer excessive wear. While the Ni/cBN abrasive coating exhibited superior wear resistance and cutting performance. The cBN grits pullout, the abrasion of Ni matrix and transfer of seal coating to the cBN grits were the main wear mechanism of the Ni/cBN abrasive coating. Additionally, it was found that the relationship between the incursion rate and high-speed rubbing behavior is quite different for the bare blade and Ni/cBN coating. The reason for the difference in wear behavior of bare blade and Ni/cBN coating at different incursion rates was discussed in detail.

关键词： Gas turbine sealing Abrasive coating High-speed rubbing Material transfer Abradable coating

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Phase Stability and Reactions of Subducting CaCO_(3)under Upper Mantle Conditions

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 309-315页

作者： GUI Weibin SHEN Kewei LIU Jin Center for High Pressure Science and Technology Advanced Research Beijing 100193China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdaoHebei 066004China

CaCO_(3)is an important component of marine sediments and one of the major deep-carbon carriers at subduction *** subducted CaCO_(3)can be dissolved in subduction fluids and recycled back to the surface via arc volcanoes *** the same time,there still remain large amounts of CaCO_(3)and its reaction products,which could be further transported into Earth's deep *** internal processes link atmosphere,hydrosphere and biosphere with the deep solid Earth,modifying the environments of our *** this review,we summarize current understanding from high pressure-temperature experiments and field petrological observations on the physical and chemical properties of CaCO_(3).In particular,the phase stability and reactions of CaCO_(3)largely control the migration and reservation of oxidized carbon in subducting ***,we present several critical but unsolved questions on CaCO_(3)subducting in the deep mantle.

关键词： calcium carbonates phase stability subducting carbon upper mantle subduction zone

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Formation mechanism of high-temperature oxidation film on WE43 magnesium alloy and its effect on corrosion performance

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Journal of Rare Earths 2024年第12期42卷 2316-2324,I0005页

作者： Ruizhi Ding Hong Yan Fangqiang Ning Yifan Song Jinliang Xu Rongshi Chen School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The oxidation behavior of WE43 magnesium alloy in dry air at three temperatures(225,440 and 525℃)and the corresponding corrosion performance of samples attached to oxide film in 3.5 wt%NaCl solution was *** results show that the oxide films formed at all three temperatures are a complex MgO·RE_(2)O_(3)·ZrO film with different *** film formed at 225℃is flat and dense,whose components are 3.2MgO·1.8RE_(2)O_(3)·*** oxidation ridges begin to form,and then gradually grow into nodular oxides and form a loose and porous oxide layer as the temperature increases to 525℃.The oxide films formed at all three temperatures improve the corrosion resistance of the alloy due to the MgO·RE_(2)O_(3)·ZrO,with the protective properties of oxide films following the order of 225℃>440℃>525℃,because the dense MgO·RE_(2)O_(3)·ZrO film formed at 225℃can provide better protection to the substrate than the loose oxide film formed at higher temperatures.

关键词： Magnesium alloy High-temperature oxidation Oxide film Corrosion resistance Rare earths

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Revealing the Void Formation Mechanism during Superplastic Deformation of a Fine-Grained Ni-Co-Base Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 915-920页

作者： Rashad AAl-Hammadi Rui Zhang Chuanyong Cui Zijian Zhou Yizhou Zhou 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

The mechanism behind void formation during superplasticity remains a subject of *** study presented a novel insight into the void formation in a fine-grained Ni-Co-based superalloy during *** was observed that the dissolution ofγ′-particles resulted in the creation of vacancies due to differences in atomic size between the matrix and the *** vacancies acted as inclusions,leading to the formation of ***,excessive void formation correlated with higher particle dissolution was experimentally observed,highlighting a direct relationship between void formation and particle dissolution.

关键词： Superplasticity Void formation Ni-Co-based superalloy Microstructure

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Multi-scale Study of the Formation and Evolution of M_(6)C Carbides in High-Tungsten Superalloys

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Acta Metallurgica Sinica(English Letters) 2024年第12期37卷 1995-2007页

作者： Xiang Fei Naicheng Sheng Shijie Sun Shigang Fan Jinjiang Yu Guichen Hou 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 ChinaShenyang110016China

The formation and evolution of M_(6)C carbides in high-W superalloy following solution treatment was investigated at different ***,during solid solution treatment,MC and M_(6)C carbides was precipitated in the *** the temperature increased,the morphology of M_(6)C carbides transitioned from granular to *** the solution treatment at 1255℃,the MC carbides degraded and transformed into M_(6)C carbides,forming a symbiotic relationship between ***,no clear orientation relationship was observed between the two types of *** further increasing the temperature to 1270℃,the precipitation of needle-like M_(6)C carbides in the dendrite arm was *** was supported by electron probe X-ray micro-analyzer and selected area electron diffraction ***,a detailed examination of the three-dimensional morphology and orientation relationship of the needle-like phase with the matrix was carried out using focused-ion-beam and transmission electron microscopy *** results indicated that the flat interface of the needle phase exhibited a specific orientation relationship with the ***,in the three-dimensional plane,the interfaces between the needle-like phase and the matrix were not ***,no clear orientation relationship between the non-straight interfaces and the matrix was *** the solution temperature increased,the tensile properties at room temperature progressively decreased,while the stress rupture properties peaked at 1260℃,suggesting that the alloy demonstrated its optimal comprehensive performance at this temperature.A subsequent analysis was conducted on the longitudinal section of the fracture using electron backscattered *** results showed a noticeable concentration of stress at the interface between MC and M_(6)C carbides,which ultimately led to crack initiation at this *** addition,as the solid solution temperature increased,the

关键词： Superalloys Tungsten Solution treatment Carbides Mechanical properties

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Effect of orbital symmetry on atomic ionization in near-infrared laser fields

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Chinese Physics B 2025年第1期34卷 289-292页

作者： Manqi Xu Shilin Hu Li Guo Jing Chen Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Physics Shanghai Normal UniversityShanghai 200234China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

We have performed a comparative study of the photoelectron spectra adopting different initial states(2s or 2_(p0))of hydrogen atoms in a near-infrared laser pulse by using the full three-dimensional time-dependent Schr?dinger *** is demonstrated that the atomic photoelectron spectra oscillate out of step as a function of electron kinetic energies for different initial states(2s or 2_(p0)),which is well reproduced by the simulations based on strong field approximation,and the above distinct feature is ascribed to the different interferences from the partial electron wave packets detached by positive and negative electric fields for different initial states of 2s and 2_(p0).

关键词： orbital symmetry photoelectron spectra strong-field approximation

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Screen-Printed 1-m-Long Sensors for Damage Detection in Welded Engineering Structures

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2023年第2期2卷 153-159页

作者： Zymelka, Daniel Kobayashi, Takeshi Sensing System Research Center National Institute of Advanced Industrial Science and Technology Tsukuba305 Japan

In this study, we demonstrate 1-m-long sensors for damage detection in welded civil engineering structures. The sensors were fabricated using screen printing and were based on a hybrid construction of a conductive intermittent pattern (made of silver) with embedded sensing elements made of carbon-based resistive ink. The sensing elements were oriented in one direction corresponding to the expected maximum strain direction. Because the electrical resistance of the silver interconnects (1.88 ± 0.14Ω) was much lower than the resistance of sensing elements (2.04 ± 0.17 kΩ), the sensing properties of the sensors depend mainly on the properties of the carbon ink (gauge factor (GF) of 13.46). Thanks to such construction, the sensing direction of the sensor could be specified at the desired orientation, and the power consumption of the 1-m-long sensor could be reduced to about 15 μW. Low power consumption is especially important regarding the applications in sensing systems that are based on Internet of Things (IoT) devices. The sensors were evaluated during various laboratory tests. It was demonstrated that although the sensor is 1-m-long, it can detect even small damage (a few mm long) effectively and hence can be suitable for applications to monitor welded construction elements in real civil structures. © 2022 IEEE.

关键词： Structural health monitoring

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Fabrication of large-scale steel-aluminum components with homogenously distributed amorphous interfacial layer and enhanced bonding strength using modified friction stir additive manufacturing

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Journal of Materials science & technology 2024年第27期194卷 151-166页

作者： M.Zhang F.C.Liu P.Xue H.Zhang L.H.Wu D.R.Ni B.L.Xiao Z.Y.Ma 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

Large-scale components of steel and aluminum alloys(Fe-Al)with high bonding strength are highly needed from space exploration to the fabrication of transportation *** formation of detrimental intermetallic compounds at the Al-Fe interface has limited the application range of the Fe-Al *** modified friction stir additive manufacturing was developed for fabricating large-scale Fe-Al compo-nents with homogenously distributed interfacial amorphous layers rather than detrimental intermetallic *** interfacial amorphous layers comprised an Mg-O rich amorphous layer<20 nm in thick-ness and an Al-Fe-Si amorphous layer<120 nm in *** interfacial amorphous layers exhibited high thermal stability and did not change even after the post-processing heat treatment of heating at 500℃ for 20 min and aging at 170℃ for 7 *** tensile strengths of the Fe-Al tensile specimens were increased from 160 to 250 MPa after the application of the post-processing heat *** fracture occurred in the aluminum alloys instead of at the dissimilar metal interface,demonstrating that high bonding strength at the Al-Fe interface was enabled by the formation of homogenously distributed interfacial amorphous layers.

关键词： Modified friction stir additive manufacturing Friction stir welding Interfacial amorphous layer Post-processing heat treatment High joint strength

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The precipitation and effect of topologically close-packed phases in Ni-based single crystal superalloys

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Journal of Materials science & technology 2024年第6期173卷 149-169页

作者： Jinguo Li Jingxia Sun Jinlai Liu 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

The precipitation of topologically close-packed(TCP)phases is the result of microstructure instabilities of Ni-based *** review seeks to comprehensively collate all the available information on TCP phases in SX superalloys based on the latest ***,the thermodynamics and kinetics of the TCP phase precipitation are ***,the morphology,composition and orientation of TCP phases and their sequential transformation are summarized in ***,the factors affecting the precipitation of these phases are sorted ***,the proposed damage mechanisms of TCP phases are ***,several control and prediction methods of the TCP phase precipitation are reviewed,so the alloy designer can better balance the relationship between microstructure stabilities and properties of the superalloy.

关键词： Ni-based superalloys Topologically close packed(TCP)phases Precipitation Microstructure stability Properties

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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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