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composition distribution in the MnxCd(1-x)In2Te4 Ingot Grown by ACRT-B Method

Journal of Materials Science & Technology 2003年第6期19卷 610-612页

作者： Yongqin CHANG, Wanqi JIE, Xiping GUO, Fuyi CHEN and Weijun ANState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China Lab. of Solidification Proc. Northwestern Polytech. Univ. Xi'an 710072 China

MnxCd1-xln2Te4 (x=0.1) ingot was successfully grown by the modified Bridgman technique, which applied the accelerated crucible rotation technique (ACRT) in Bridgman process, or briefly ACRT-B. The growth interface profile shape and the composition distribution in the MnxCd1-xln2Te4 (x=0.1) ingot were analyzed. Even though the stoichiometric composition was synthesized in the original ingot, the composition has been redistributed during the ACRT-B growth process. Mn and Cd contents decrease while In increases along the longitudinal axis. The partition ratios of solutes Mn, Cd and In at the growth interface are evaluated by a mathematical method based on the experimental data, which are found to be 1.286, 1.926 and 0.729 in α phase growth process, and 1.120, 1.055 and 0.985 in β phase growth process, respectively. In the radial direction, Mn and Cd contents increase while In decreases with the distance from the centerline of the ingot.

关键词： MnxCd1-xIn2Te4 ACRT-B composition distribution Partition ratio

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Preparation and composition distribution in Hollow Tubular TiB-Ti Composites during Centrifugal Spraying Process

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 518-524页

作者： ZHANG Zhongren DU Runkun ZHANG Fan ZHANG Jinyong LEI Liwen WANG Wei School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China

The hollow cylinders of TiB-Ti composites with a gradient distribution of Ti phase were synthesized by the combination of traditional slurry spray with centrifugal forming *** influences of the concentration of sodium hexametaphosphate(SHMP),the concentration of polyvinyl alcohol(PVA)and solid content(20 vol%-35 vol%)on the rheological properties of the TiB_(2)-Ti composite slurries were *** with low viscosity,weak thixotropy and shear-thinning behaviour were obtained for facilitating the slurry spraying *** effects of different centrifugal conditions on the migration of components during the forming process were *** phase composition and the elements distribution of the prepared samples were characterized by the energy-dispersive X-ray *** observations revealed that the samples fabricated at 1500 r/min for 3 min had a significant composition *** two-phase systems with small density differences and large particle size variation,centrifugal time was more important than centrifugal speed in forming a continuous gradient structure.

关键词： hollow tubular TiB-Ti composites centrifugal spraying process rheological properties composition distribution

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Effects of copper and zirconium contents on microstructure and magnetic properties of Sm(Co,Fe,Cu,Zr)_(z)magnets with high iron content

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Journal of Rare Earths 2021年第2期39卷 160-166页

作者： Zhifeng Shang Dongtao Zhang Zhihong Xie Yunqiao Wang Muhammad Haseeb Pengbiao Qiao Weiqiang Liu Ming Yue College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China

The evolution of the microstructure,microchemistry and magnetic properties of the Sm(CobalFe_(0.28)-CuyZrx)_(7.6)magnets with different Zr and Cu contents was *** is found that the coercivity of the Sm(Co,Fe,Cu,Zr)_(z)magnets is sensitive to Zr *** deficiency of Zr content causes heterogeneity of Cu and Fe distributions,while an excessive Zr content leads to the formation of a SmCoZr impurity *** cellular structure and distribution of Cu *** between the cell boundary phase and cell pha se are destroyed by inappropriate Zr content,which results in a reduction of *** Cu concentration difference between the cell boundary phase and cell phase increases with increasing Cu *** coercivity of the Sm(CobalFe_(0.28)CuyZ_(r0.02))_(7.6)magnets increases from 10.4 to 25.4 kOe for y=0.05 and y=***,the excess of Cu element destroys the cell boundary phase and enlarges the cell size,resulting in a significant decrease of squareness and energy *** optimum performance(remanence of 11.4 kG,coercivity of 25.4 kOe,maximum magnetic ene rgy product of 30.4 MGOe)was obtained for the Sm(Co_(0.63)Fe_(0.28)Cu_(0.07)Zr_(0.02))_(7.6)magnet.

关键词： Sm(CoFeCuZr)_(z)permanent magnets Cu Zr Microstructure Magnetic properties composition distribution

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Effect of Powder Particle Size on the Fabrication of Ti-6Al-4V Using Direct Laser Metal Deposition from Elemental Powder Mixture

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Journal of Mechanics Engineering and Automation 2016年第7期6卷 348-355页

作者： Xueyang Chen Lei Yan Wei Li Zhiyuan Wang Frank Liou Joe Newkirk The Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology Rolla MO 65409USA The Department of Materials Science and Engineering Missouri University of Science and Technology Rolla MO 65409 USA

Direct LMD （laser metal deposition） was used to fabricate thin-wall Ti-6Al-4V using the powder mixture of Ti-6 wt.%Al-4 wt.%V. SEM （scanning electron microscopy）, OM （optical microscopy） and EDS （energy dispersive spectroscopy） were employed to examine the chemical composition and microstructure of the as-deposited sections. Vickers hardness tests were then applied to characterize the mechanical properties of the deposit samples which were fabricated using pre-mixed elemental powders. The EDS line scans indicated that the chemical composition of the samples was homogenous across the deposit. After significant analysis, some differences were observed among two sets of deposit samples which varied in the particle size of the mixing Ti-6wt.%Al-4wt.%V powder. It could be found that the set with similar particle number for Ti, Al and V powder made composition much more stable and could easily get industry qualified Ti-6Al-4V components.

关键词： Laser metal deposition Ti-6Al-4V elemental powder EDS composition distribution Vickers hardness.

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