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Effect of ti and Al on microstructure and partitioning behavior of alloying elements in Ni-based powder metallurgy superalloys

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 500-506页

作者： Yin-long Shao Jing Xu Hao Wang Yi-wen Zhang Jian Jia Jian-tao Liu Hai-liang Huang Ming Zhang Zhi-cheng Wang Hong-fei Zhang Ben-fu Hu Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening Guangdong Institute of Materials and Processing School of Materials Science and Engineering University of Science and Technology Beijing High Temperature Material Research Institute Central Iron and Steel Research Institute

The microstructure and partitioning behaviors of alloying elements in the γ and γ′ phases in Ni-based powder metallurgy superalloys with different ti and Al contents were investigated. The results showed that ti and Al were mainly enriched in the γ′ phase, partially partitioned in the γ matrix, and slightly distributed in the carbides. Different ti and Al contents in various alloys influenced the composition and amount of MC carbides but did not influence the MC carbides' morphology. With increasing ti and Al contents, γ + γ′ fan-type structures formed at the grain boundary, eventually resulting in a coarsened γ′ phase. In addition, the morphology of the secondary γ′ phase transformed from nearly spherical to cuboidal. The saturation degrees of Cr, Co, and Mo in the γ matrix were substantially improved with increasing ti and Al contents.

关键词： superalloy Al ti microstructure partitioning

EFFECTS OF INTERStitiAL IMPURItiES ON PHASE TRANSFORMAtiON OF ti-Al ALLOYS

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中国有色金属学会会刊：英文版 1999年第1期9卷 59-64页

作者： Li, Wen Chen, Daimin Zhang, Ruilin Changchun Univ Changchun China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｉｔａｎｉｕｍａｌｕｍｉｎｉｄｅｃｏｍｐｏｕｎｄｓｈａｖｅｒｅｃｅｉｖｅｄｃｏｎｓｉｄｅｒａｂｌｅａｔｅｎｔｉｏｎｒｅｃｅｎｔｌｙａｓｃａｎｄｉｄａｔｅｍａｔｅｒｉａｌｓｆｏｒ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｉｔａｎｉｕｍａｌｕｍｉｎｉｄｅｃｏｍｐｏｕｎｄｓｈａｖｅｒｅｃｅｉｖｅｄｃｏｎｓｉｄｅｒａｂｌｅａｔｅｎｔｉｏｎｒｅｃｅｎｔｌｙａｓｃａｎｄｉｄａｔｅｍａｔｅｒｉａｌｓｆｏｒｒｅｌａｔｉｖｅｌｙｈｉｇｈｔｅｍ...

关键词： ti Al alloys phase transformation valence electron structure interstitial impurities

ti, Zn co-doped hematite photoanode for solar driven photoelectrochemical water oxidation

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Journal of Energy Chemistry 2019年第8期28卷 30-36,I0002页

作者： Quansong Zhu Chunlin Yu Xingwang Zhang Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang UniversityHangzhou310027 Zhejiang China College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310027 Zhejiang China

Although there have been many reports of metal doping to ameliorate the drawbacks of hematite as the photoanode for water oxidation, most of them focused on monometallic doping, and only a few of them payed attention to bimetallic doping. What is worse, the synergetic mechanism between two metal dopants was not sufficiently studied, especially the density functional theory(DFT) calculation. In this work, the n-type hematite was synthesized by introducing ti dopant into hematite through the hydrothermal method, and dipping-sintering treatment was employed to further introduce homogeneously dispersed Zn dopant into that, forming the ti, Zn co-doped hematite. Under the optimal condition, tidoped hematite photoanode reached approximately 2-times enhancement of the photocurrent density compared with the pristine one at 1.23 V vs. RHE, while ti, Zn co-doped hematite anode obtained another25% elevation. UV–Vis spectroscopy, Mott–Schottky plots, EIS analysis, photo-oxidation of hole scavenger(H2O2), and DFT calculation were employed to understand the role of ti, Zn dopant. Based on the obtained results, the synergetic mechanism of two dopants was discussed, i.e., the improvement of PEC performance of ti, Zn co-doped hematite photoanode was possibly attributed to greater carrier density and improved charge separation efficiency at the surface of hematite. This work provides new strategy and understanding of the improvement of PEC performance of hematite by doping engineering.

关键词： Photoelectrochemical water oxidation Hematite ti Zn co-doping DFT calculation

Enhancement of Thermoelectric Performance of Sr0.9Ba0.1ti0.8Nb0.2O3 Ceramics by A-Site Cation Nonstoichiometry

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Chinese Physics Letters 2015年第3期32卷 113-116页

作者：张鑫刘剑李宜苏文斌李吉超祝元虎李茂奎王春明王春雷 School of Physics State Key Laboratory of CrystM Materials Shandong University Jinan 250100 Taishan College Shandong University Jinan 250100

Sr0.9Ba0.1ti0.8Nb0.2O3 ceramics （x=0, 0.01, 0.02 and 0.05） are prepared by solid state reaction, whose thermoelectric properties are investigated from 323K to 1073K. By introducing A-site nonstoichiometry, the absolute Seebeck coefficient is enhanced, while the electrical resistivity is surprisingly reduced due to the significantly enhanced carrier mobility. These results are dramatic in thermoelectric materials, effectively enhancing the power factor. Moreover, the thermal conductivity is reduced, thus the thermoelectric performance of Sr0.9Ba0.1ti0.8Nb0.2O3 ceramic is significantly enhanced by A-site nonstoiehiometry.

关键词： Ba Nb O3 Ceramics by A-Site Cation Nonstoichiometry ti

AN IN-SITU STUDY ON DISLOCAtiON BEHAVIOR OF CRACK-tiP IN ti_3Al-Nb ALLOY

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中国有色金属学会会刊：英文版 1997年第3期7卷 31-37页

作者： Wu, Y Zhen, L Yang, DZ Liang, W HARBIN INST TECHNOL SCH MAT SCI & ENGN HARBIN 150001 PEOPLES R CHINA TAIYUAN UNIV TECHNOL DETECTING CTR TAIYUAN 030024 PEOPLES R CHINA

ＡＮＩＮＳＩＴＵＳＴＵＤＹＯＮＤＩＳＬＯＣＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＣＲＡＣＫＴＩＰＩＮＴｉ３ＡｌＮｂＡＬＬＯＹ①ＷｕＹｉｎｇ，ＺｈｅｎＬｉａｎｇ，ＹａｎｇＤｅｚｈｕａｎｇＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓ... 详细信息

ＡＮＩＮＳＩＴＵＳＴＵＤＹＯＮＤＩＳＬＯＣＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＣＲＡＣＫＴＩＰＩＮＴｉ３ＡｌＮｂＡＬＬＯＹ①ＷｕＹｉｎｇ，ＺｈｅｎＬｉａｎｇ，ＹａｎｇＤｅｚｈｕａｎｇＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒ...

关键词： ti 3Al Nb alloy tensile deformation crack propagation dislocation

Effect of trace ti and Y on mechanical properties of Au-based alloys with 990 fineness

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Rare Metals 2005年第2期24卷 178-184页

作者： YANGQingqing XIONGWeihao ZHANGJie NationalKeyLaboratoryforDie＆MouldTechnology HuazhongUniversityofScienceandTechnologyWuhan430074China

The effect of trace ti and Y on Au-based alloys with 990 fineness has beeninvestigated systematically by means of tensile test, hardness test, scanning and transmissionelectron microscopic analyses. These experimental results show that trace ti and Y can significantlyimprove the mechanical properties of Au-based alloys with 990 fineness because ti and Y cansignificantly refine matrix grains, and solid solution strengthening, work strengthening andprecipitation strengthening occur during mechanical heat treatment.

关键词： Au-based aloys with 990 fineness mechanical properties ti Y

INFLUENCE OF INItiAL TEXTRUE ON THE COLD ROLLING TEXTURE OF ti SHEETS

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中国有色金属学会会刊：英文版 1995年第2期5卷 66-70页

作者： Mao, Weimin Yu, Yongning Li, Botao(University of Science and Technology Beijing, 100083 Beijing) Univ of Science and Technology Beijing Beijing China

ＩＮＦＬＵＥＮＣＥＯＦＩＮＩＴＩＡＬＴＥＸＴＲＵＥＯＮＴＨＥＣＯＬＤＲＯＬＬＩＮＧＴＥＸＴＵＲＥＯＦＴｉＳＨＥＥＴＳ￥Ｍａｏ，Ｗｅｉｍｉｎ；Ｙｕ，Ｙｏｎｇｎｉｎｇ；Ｌｉ，Ｂｏｔａｏ（ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎ... 详细信息

ＩＮＦＬＵＥＮＣＥＯＦＩＮＩＴＩＡＬＴＥＸＴＲＵＥＯＮＴＨＥＣＯＬＤＲＯＬＬＩＮＧＴＥＸＴＵＲＥＯＦＴｉＳＨＥＥＴＳ￥Ｍａｏ，Ｗｅｉｍｉｎ；Ｙｕ，Ｙｏｎｇｎｉｎｇ；Ｌｉ，Ｂｏｔａｏ（ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙＢｅ...

关键词： ti Rolling Texture ODF

Effect of ti and rare earth on microsegregation and large-sized precipitates of H13 steel

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Journal of Iron and Steel Research International 2021年第12期28卷 1591-1604页

作者： Fa Ji Rui Xu Yu-long Gao Qing-chao tian Lu Wang Zhi-xia Xiao Fu-xing Yin School of Materials Science and Engineering Hebei University of TechnologyTianjin300130China Research Institute for Energy Equipment Materials Hebei University of TechnologyTianjin300130China State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai200444China

Large-sized precipitates are fatal to the thermal fatigue of H13 hot work die *** amounts of ti and/or rare earth(RE)were added in H13 steel during electroslag remelting to improve the element segregation and refine the large-sized *** results show that as ti content increases from 0.0032 to 0.057 wt.%,the segregation of Cr,Mo and V becomes more severe.V-rich M(C,N)carbides are shorter,and their branches are denser in 3D ***,the number density of V-rich M(C,N)carbides with a size less than 2μm increases and that with other sizes *** addition,ti-rich MN nitrides with the size greater than 4μm increases significantly at high ti *** RE content increases from 0.0051 to 0.036 wt.%,the segregation of main alloying elements is first weakened and then *** with that in RE-free H13 steel,V-rich M(C,N)carbides are less developed in 3D observation,and the change in number density is similar to that of ti-modified *** composite modification of 0.024 wt.%ti and 0.011 wt.%RE,the segregation of alloying element and V-rich M(C,N)carbides are not significantly improved.

关键词： H13 steel Segregation Primary carbide ti Rare earth Precipitate

Characterization of magnetron sputtering tiB_2 and ti-B-N thin films

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中国有色金属学会会刊：英文版 2000年第5期10卷 619-624页

作者：张同俊 Huazhong Univ Sci & Technol State Key Lab Dies Technol Wuhan 430074 Peoples R China Northwestern Univ BIRL Ind Res Lab Evanston IL 60201 USA Northwestern Univ Dept Mat Sci & Engn Robert R McCormick Sch Engn & Applicat Sci Evanston IL 60208 USA

tiB 2 and ti B N films on various substrates were synthesized using ionized dc magnetron sputtering. A two turn coil powered by 13.56 MHz r.f. was used to enhance the ionization fraction of the plasma. The structure and properties of the films are affected by several parameters such as substrate bias, total pressure and nitrogen partial pressure and by the substrate materials. The crystallinity and the hardness of the films increase with decreasing total pressure. Well crystallized tiB 2 films with strong (0001) texture and with hardness up to 50 GPa were produced. Nitrogen doping into tiB 2 films decreases their crystallinity and hardness. About 1 GPa residual compressive stress was determined by a wafer curvature technique. It was performed that the dry friction of several different hard films against hardened 52100 steel, which showed the tiB 2 and ti B N films existing the lowest friction coefficient and the lowest wear rate. [

关键词： tiB 2 and ti B N coating dc magnetron sputtering residual stress mechanical properties tribology