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Effect of Grain Refinement on Microtexture and Mechanical Properties of Inconel 617 Alloy

稀有金属材料与工程 2024年第12期53卷 3313-3320页

作者： Ji Jinjin Jia Zhi Yang Peiyao Wang Yanjiang Kou Shengzhong School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Engineering Lanzhou Institute of TechnologyLanzhou 730050China

The microstructure and mechanical properties of Inconel 617 alloy rolled at room temperature with different deformation degrees(20%,50%,70%)were *** grain refinement mechanism and main texture types of Inconel 617 alloy during rolling were analyzed via electron backscatter diffraction and X-ray diffraction,and the microhardness and tensile properties of Inconel 617 alloy with different deformation degrees were *** reveal that the grains of Inconel 617 alloy are refined during the rolling deformation process,and the refinement mechanism is the fragmentation of original grains caused by the increase in dislocation density and strain *** main microtextures of the rolled samples are Goss{011}<001>,Rotated Goss{110}<110>,Brass{011}<211>,and P{011}<112>textures,and their intensity is increased with increase in deformation *** rolling deformation,the strength of the Inconel 617 alloy is improved and the ductility is reduced by the combined effect of grain refinement and dislocation ***,the yield strength and elongation of Inconel 617 alloy after 20%deformation are 772.48 MPa and 0.1962,respectively,presenting good synergy effect.

关键词： Inconel 617 alloy grain refinement microtexture microhardness tensile properties

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BaTiO_(3)/Polyurethane Dielectric Composites with Diels-Alder Bond for Improved Self-Healing Properties

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Journal of Renewable materials 2022年第9期10卷 2355-2364页

作者： unlong Yao Wei Nie Zhengguang Sun Huan Yang Yu Guan Lin Gao Xueliang Jiang Mujie Guo Chuanxi Xiong Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan430205China Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205China School of Chemistry and Environmental Engineering Jianghan UniversityWuhan430056China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China

In general,self-healing dielectric composites are mainly composed of polar hydrogen bonds,which have high hydrophilicity and are unsuitable for humid *** composite with Diels-Alder(D-A)bond contains covalent bonds,it can be adopted as an efficient self-healing ***,we construct self-healing barium titanate(BT)/polyurethane(PU)dielectric composites by adopting PU with D-A bond as matrix(BT/PU-DA).The prepared 10%BT/PU-DA composite exhibits superior self-healing ability than that of ***,its dielectric constant can reach 9.3 with a loss of only 0.04 at 1000 Hz and maintain 93%repair efficiency of tensile *** experimental analysis suggests the introduction of D-A bond can enhance the thermostability and self-healing ability of BT/PU-DA *** addition,the incorporation of BT nanoparticles and D-A bond in the self-healing composite contributes to the lower dielectric loss and excellent tensile strength after *** adopted strategy is a promising and facile approach to develop highly efficient selfhealing dielectric material,which will be conducive to reuse and sustainable development of the electronic packaging material in aqueous medium or wet environment.

关键词： Diels-Alder bond self-healing dielectric properties tensile strength polyurethane

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Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

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China Foundry 2022年第6期19卷 495-502页

作者： Qin Xu Qi Wang De-zhi Chen Yi-ang Fu Qing-sheng Shi Ya-jun Yin Shu-yan Zhang School of Mechanic and Electrical Engineering Henan University of TechnologyZhengzhou 450001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science&TechnologyWuhan 430074China Centre of Excellence for Advanced Materials Songshan LakeDongguan 523808GuangdongChina

Refractory high-entropy alloys are considered as potential structural materials for elevated temperature *** obtain refractory high-entropy alloys with high strength,different amounts of Si were added into the NbMoTiVW refractory high-entropy *** effects of Si on the phase constitution,microstructure characteristics and mechanical properties of NbMoTiVWSi_(x) alloys were *** show that when the addition of Si is 0,0.025 and 0.05(molar ratio),the alloys are consisted of primary BCC and secondary BCC in the intergranular *** the addition of Si is increased to 0.075 and 0.1,eutectic structure including silicide phase and secondary BCC phase is *** primary BCC phase shows dendritic morphology,and is refined by adding *** volume fraction of intergranular area is increased from 12.22%to 18.13%when the addition of Si increases from 0 to *** ultimate compressive strength of the NbMoTiVW alloy is improved from 2,242 MPa to 2,532 *** yield strength is also improved by the addition of Si,and the yield strength of NbMoTiVWSi_(0.1) reaches maximum of 2,298 ***,the fracture strain of the alloy is decreased from 15.31%to 12.02%.The fracture mechanism of the alloys is changed from mixed fracture of ductile and quasi-cleavage to cleavage fracture with increasing of *** strengthening of alloys is attributed to the refinement of primary BCC phase,volume fraction increment of secondary BCC phase,and formation of eutectic structure by addition of Si.

关键词： high-entropy alloy second phase microstructure refinement mechanical property strengthening

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High wave transmittance and low thermal conductivity Y-a-SiAlON porous ceramics for high-temperature radome applications

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Journal of advanced Ceramics 2023年第6期12卷 1273-1287页

作者： Runwu Yang Jie Xu Jia Guo Xuanyu Meng Ping Zhang Fengying Fan Yanan Qu Feng Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China NPU-QMUL Joint Research Institute of Advanced Materials and Structure Northwestern Polytechnical UniversityXi'an 710072China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

With the development of hypersonic vehicle technology,ceramic-based radome materials are highly demanded due to their high operating temperatures,good dielectric properties,and high mechanical ***α-SiAlON is an ideal material for radome applications,its intrinsic low transmittance and high thermal conductivity limit its ***,we prepared Y-α-SiAlON porous ceramics through tert-butanol(TBA)gel-casting using the self-synthesizedα-SiAlON *** Y-α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with the porosity(P)of 44.2%-58.6%.The real part of permittivity(s')was 3.13-4.18(8.2-12.4 GHz),which decreased significantly with the increasing *** wave transmittance(|T|^(2))of the sample with porosity of 58.6%could exceed 80%in the thickness range of 6-10 *** thermal conductivity was maintained at a low level of 1.38-2.25 W·m^(-1)·K^(-1) owing to the introduction of the pore *** flexural strength was 44.73-88.33 MPa,which may be increased by rod-likeα-SiAlON *** results indicate that the prepared Y-α-SiAlON porous ceramics meet the requirements of high-temperature wave-transmitting materials for radome applications.

关键词： a-SiAlON porous ceramics wave-transmittance materials thermal conductivity flexural strength

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g-C_(3)N_(4)nanosheets coupled with CoSe_(2)as co-catalyst for efficient photooxidation of xylose to xylonic acid

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Green Energy & Environment 2025年第1期10卷 231-238页

作者： Qi Hao Yijun Liu Ren Zou Ge Shi Shilian Yang Linxin Zhong Wu Yang Xiao Chi Yunpeng Liu Shimelis Admassie Xinwen Peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou510641GuangdongChina Hainan Key Laboratory of Storage&Processing of Fruits and Vegetables Agricultural Products Processing Research InstituteChinese Academy of Tropical Agricultural SciencesZhanjiangGuangdong524001China Department of Chemistry and Centre for Advanced 2D Materials(CA2DM)National University of Singapore 3 Science Drive 3 Singapore117543Singapore School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528231GuangdongChina Department of Chemistry Addis Ababa UniversityPO BOX 1176Addis AbabaEthiopia

Photocatalysis has emerged as an effective approach to sustainably convert biomass into value-added ***_(2)is a promising nonprecious,efficient cocatalyst for photooxidation,which can facilitate the separation of photogenerated electron–holes,increase the reaction rates,and enhance photocatalytic *** this work,we synthesized a stable and efficient photocatalysis system of CoSe_(2)/g-C_(3)N_(4)through attaching CoSe_(2)on g-C_(3)N_(4)sheets,with a yield of 50.12%for the selective photooxidation of xylose to xylonic *** light illumination,the photogenerated electrons were prone to migrating from g-C_(3)N_(4)to CoSe_(2)due to the higher work function of CoSe_(2),resulting in the accelerated separation of photogenerated electron–holes and the promoted ***,this study reveals the unique function of CoSe_(2),which can significantly promote oxygen adsorption,work as an electron sink and accelerate the generation of ·O_(2)^(-),thereby improving the selectivity toward xylonic acid over other *** work provides useful insights into the design of selective photocatalysts by engineering g-C_(3)N_(4)for biomass high-value utilization.

关键词： Biomass photooxidation Hemicelluloses Xylose g-C_(3)N_(4) Xylonic acid

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Ultrathin layered double hydroxide nanosheets prepared by original precursor method for photoelectrochemical photodetectors

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Nano Research 2022年第10期15卷 9392-9401页

作者： Yu Wang Fulai Zhao Yiyu Feng Wei Feng School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300350China Key Laboratory of Materials Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Layered double hydroxides(LDHs)are widely used owing to their unique alternating anionic and cationic layered twodimensional(2D)***,studies on the preparation of 2D LDH nanosheets with uniform thickness and their photodetectors are *** this study,two novel ultrathin LDH(Ca-In and Ca-Al LDH)nanosheets are peeled off from precursor bimetallic phosphides through the original precursor *** Ca-In and Ca-Al LDH nanosheets demonstrate a uniform thickness distribution with an average thickness of 3–4 nm,micron-level lateral sizes,and moderate *** to its broad light absorption range,hydrophilicity,and stability,Ca-In and Ca-Al LDH nanosheets are applied for the first time in photoelectrochemical photodetectors,realizing a wide range of light detection from ultraviolet(365 nm)to visible light(635 nm).Moreover,the fabricated photodetectors exhibit excellent cycle stability,and the average photocurrent density shows no reduction after 70 ***,this study provides an effective method to prepare 2D Ca-In and Ca-Al LDH nanosheets with uniform thickness and photoelectric application prospects.

关键词： layered double hydroxides precursor method thickness photoelectrochemical photodetectors calculations

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Numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method

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Particuology 2024年第7期90卷 179-188页

作者： Chengming Xie Rongbin Li Qijin Wei Fengqin Liu Hongliang Zhao Yongmin Zhang Hong Yong Sohn State Key Laboratory of Green and Low-carbon Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China BGRIMM Technology Group Beijing 100160China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Department of Materials Science and Engineering The University of UtahSalt Lake CityUT 84112USA

A full-cycle numerical simulation of a circulating fluidized bed(CFB)by the use of the computational particle fluid dynamics(CPFD)method has been *** effects of the presence or absence of the secondary air,different secondary air positions,and different secondary air ratios on the gas–solid flow characteristics were *** results show that the presence of the secondary air makes a core-annular structure of the velocity distribution of particles in the fluidized bed,which enhances the uniformity of particles’distribution and the stability of *** position and the ratio of the secondary air have a significant impact on the particle distribution,particle flow rate,and gas flow rate in the fluidized *** the secondary air position and ratio are optimal,the particles,particle flow rate,and air flow rate in the CFB are evenly distributed,the gas–solid flow state is good,and the CFB can operate stably.

关键词： Circulating fluidized bed CPFD method Secondary air position Secondary air ratio Gas–solid flow characteristics

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Hollow Zn/Co zeolitic imidazolate framework-implanted composite hydrogel for highly efficient uranium extraction from seawater

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Nano Research 2023年第7期16卷 10451-10461页

作者： Yucheng Song Xin Ma Huanhuan Tan Zhong Liu Chuntai Liu Changyu Shen Peipei Yang Songwei Li National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Henan Tuoren Medical Device Co. Ltd.Weiyuan Industrial ParkChangyuan 453400China

Efficient capture of uranium(VI)(U(VI))from seawater is of great significance to the sustainable development of nuclear energy and environmental protection,which is also a serious challenge at *** this study,hollow Zn/Co zeolitic imidazolate framework(H-ZIF)was decorated on polyacrylamide/sodium alginate(PAM/SA)hydrogel by chelating and covalently crosslinking,and a new type of PAM/SA/H-ZIF hydrogel was *** combination of PAM/SA and H-ZIF gives PAM/SA/H-ZIF hydrogel excellent mechanical properties,good stability,and abundant surface functional groups,which is beneficial to improving the adsorption *** extraction amount of U(VI)by PAM/SA/H-ZIF is 171.14 mg·g^(-1)at C_(0)=99.52 mg·L^(-1)and pH=*** adsorption equilibrium is reached in 120 min and the adsorption process fits well with Langmuir isotherm model and pseudo-second-order rate *** PAM/SA/H-ZIF also showed good recyclability and stability after 10 cycles of *** importantly,the rate of uranium adsorption is 0.196 mg·g^(-1)·day^(-1)after 30 days,which implies that the PAM/SA/H-ZIF could serve as a potential adsorbent for the development of uranium capture from seawater.

关键词： hydrogel hollow metal-organic framework uranium capture seawater

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Playdough-like carbon electrode: A promising strategy for high efficiency perovskite solar cells and modules

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eScience 2024年第2期4卷 101-107页

作者： Aodong Zhu Lin Chen Ao Zhang Chenpu Zhu Xinxin Zhang Jie Zhong Fuzhi Huang Yi-Bing Cheng Junyan Xiao School of Materials Science and Engineering Wuhan University of Technology122 Luoshi RoadWuhanHubeiChina State Key Laboratory of Advanced Technologies for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi RoadWuhanHubeiChina School of Chemistry and Chemical Engineering Huazhong University of Science and Technology1037 Luoyu RoadWuhanHubeiChina Research Centre for Advanced Thin Film Photovoltaics Wuhan University of Technology122 Luoshi RoadWuhanHubeiChina Jinan Municipal Bureau of Industry and Information Technology JinanShandongChina

Carbon-based perovskite solar cells(C-PSCs)are promising candidates for large-scale photovoltaic applications due to their theoretical low cost and high ***,the fabrication of high-performance C-PSCs with large-area electrodes remains *** this work,we propose a novel playdough-like graphite putty as top electrode in the perovskite *** electrode with soft nature can form good contact with the holetransporting layer and the conductive substrate at room temperature by a simple pressing technique,which facilitates the fabrication of both small-area devices and perovskite solar *** this preliminary research,the corresponding small devices and modules can achieve efficiencies of 20.29%(~0.15 cm^(2))and 16.01%(~10 cm^(2)),***,we analyze the limitations of the optical and electrical properties of this playdough-like graphite electrode on the device performance,suggesting a direction for further improvement of C-PSCs in the future.

关键词： Perovskite solar cells Large-area module Carbon electrode Conductive playdough

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Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining

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International Journal of Minerals,Metallurgy and materials 2023年第2期30卷 365-377页

作者： Chen Chen Jingwei Li Qiuxia Zuo Boyuan Ban Jian Chen Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Mineral Processing BGRIMM Technology GroupBeijing 100160China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650504China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of EducationHefei University of TechnologyHefei 230009China Shandong Aluminum Vocational College Weihai 264400China

To remove the key impurity elements,P and B,from primary Si simultaneously,Sr and Zr co-addition to Al-Si alloy systems during solvent refining has been *** reacts with Al,Si,and P in the melt to form a P-containing Al_(2)Si_(2)Sr phase and Zr reacts with B to form a ZrB_(2) *** the Al-Si-Sr-Zr system,high removal fractions of P and B in the primary Si,with 84.8%-98.4%and 90.7%-96.7%,respectively,are achieved at the same time,*** best removal effect is obtained in the sample with the addition of Sr-32000+Zr-3000μg·kg^(-1),and the removal fractions of P and B in the purified Si reach 98.4%and 96.1%.Compared with the Sr/Zr single-addition,the removal effects of Sr and Zr co-addition on P and B do not show a significant downward trend,indicating that the nucleation and growth of the B/P-containing impurity phases are mutually ***,an evolution model is proposed to describe the nucleation and the growth stages of Sr/Zr-containing compound phases,which reveals the interaction between the impurity phases and the primary Si.

关键词： Al2Si2Sr phase zirconium boride phase phase directional solidification solvent refining

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