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LOCAL STRUCTURE OF SUPERCOOLED LIQUID Ni₈₀P₂₀ ALLOY

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Acta Metallurgica Sinica(English Letters) 1995年第3期8卷 185-189页

作者： Chen Kuiying Liu Hongbo hu zhuangqi Inst of metal Research Chinese Acad of Sciences Shenyang China

Local arrangement of atoms in supercooled liquid Ni_(80)P_(20) alloy has been investigated by using NPT-MD simulation techniques based on the effective pair Potentials derived for Ni-P system. Bond-orientational order, the long-range correlation function and symmetrical parameters by pair-analysis approach have been calculated for supercooled liquid Ni_(80)P_(20) alloy. Results show. that in case of Ni_(80) .P_(20) alloy, the local structure is all random-like whether the centre of cluster is located at atoms Ni or P. It indicates that the icosahedral symmetry is not the unique model to describe the microstructure in supercooled liquid metals.

关键词： supercooled liquid metal,Ni_(80)P_(20)alloy molecular dynamics,tocal

Rapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent iron

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Journal of Environmental Sciences 2012年第6期24卷 1021-1026页

作者： Changqin Zhang Zhengwang Zhu Haifeng Zhang zhuangqi hu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial *** experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution *** analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar *** experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and *** study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes.

关键词： amorphous zero-valent iron Acid Orange Ⅱ decolorization surface-normalized decolorization rate recycle amorphous zero-valent iron Acid Orange II decolorization surface-normalized decolorization rate recycle

CREEP DEFORMATION AND FRACTURE OF DZ40M DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY AT HIGH TEMPERATURE

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中国有色金属学会会刊：英文版 1999年第2期9卷 65-68页

作者： Wenhui, Jiang Xiangdong, Yao Hengrong, Guan zhuangqi, hu Chinese Acad of Sciences Shenyang China

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关键词： directional solidificationcobaltbase superalloycreepfracture

Thermal fatigue behavior of K465 superalloy

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Rare Metals 2006年第3期25卷 202-209页

作者： YANG Jinxia ZHENG Qi SUN Xiaofeng GUAN Hengrong hu zhuangqi Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy （SEM） and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast （named as K465） and solution heat treatment （named as SK465） conditions. In K465 alloy, most thermal fatigue cracks nucleate at （Nb,W,Ti）C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode, and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy.

关键词： K465 superalloy thermal fatigue crack initiation and growth carbides

Precipitation Behaviors in the Diffusion Affected Zone of TLP Bonded Single Crystal Superalloy Joint

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Journal of Materials Science & Technology 2015年第2期31卷 129-134页

作者： Naicheng Sheng Jide Liu Tao Jin Xiaofeng Sun zhuangqi hu Superalloys Division Institute of Metal ResearchChinese Academy of Sciences

The single crystal superalloys were joined by transient liquid phase(TLP) bonding. The precipitating behavior in the diffusion affected zone(DAZ) was studied and the hardness across the DAZ was analyzed. Results have shown that there existed M3B2,M5B3 and M23B6 borides in the DAZ. With increasing bonding time,fine M3B2 precipitates formed first near the isothermal solidification zone(ISZ)/matrix interface. Then,the dendritic M5B3 precipitates formed with an obvious orientation relationship with the substrate. The acicular precipitates were constituted by M23B6 and M5B3 phases with continuous or discontinuous morphologies. The hardness of the DAZ reached a summit in the fine M3B2 region and decreased with the increase of the distance away from the ISZ/matrix interface.

关键词： Single crystal superalloy Transient liquid phase b

Influence of heat treatment on the microstructure and mechanical properties of DZ951 alloy

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Rare Metals 2008年第2期27卷 216-222页

作者： XIA Pengcheng YU Jingjiang SUN Xiaofeng GUAN Hengrong hu zhuangqi Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266510 China

DZ951 directionally solidified nickel-base superalloy is mainly strengthened by γ phase. Regularly aligned cuboidal and bimodal γ precipitates were attained by two heat treatments. The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to little blocks during aging treatment at 1050℃ （HT1）. MC carbide partly degrades into M23C6 and there is a layer of γ around the carbide during aging treatment at 1150℃ （HT2）, which is beneficial to the elongation of DZ951 alloy. Small γ volume fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy. HT1 alloy has a better stress rupture life at 1100℃/50 MPa and yield stress at 20℃, 800℃ and 1100℃, which is attributed to regularly aligned cuboidal γ phase and even deformation structure. HT2 alloy has a good combination of strength and ductility. This arises from the bimodal γ precipitates and the degeneration of MC carbide.

关键词： DZ951 alloy heat treatment microstructure mechanical properties

Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy

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Journal of Materials Science & Technology 2010年第10期26卷 889-894页

作者： Jian Zhang Jinguo Li Tao Jin Xiaofeng Sun zhuangqi hu Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

A single crystal Ni-base superalloy was processed with withdrawal rates between 2 and 7 mm/*** ascast microstructures,heat treatment response and creep property have been characterized as a function of the withdrawal *** expected,the primary and secondary dendrite arm spacing decreased with increasing withdrawal rate; microsegregation degree and porosity distribution were also varied with different withdrawal *** withdrawal rate of 2 mm/min resulted in a noticeable residual microsegregation even after full heat *** samples solidified at 7 mm/min exhibited a high density of cast porosities,and this led to a dramatical decline of the creep strain.4 or 6 mm/min appeared to be the optimum withdrawal rate in the present study,which resulted in a uniform microstructure and an optimum density of cast porosity.

关键词： Single crystal superalloy Withdrawal rate Microstructure Creep

Preparation of Ni-W-10Y_2O_3 refiner and refinement mechanism in a superalloy

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 365-372页

作者： Weiguo JIANG Mingchuan YANG Langhong LOU Fenghua HOU zhuangqi hu Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A novel grain refiner composed of nickel, tungsten and yttria was prepared by the powder metallurgy way. The mierostructure of the refiner alloy was studied by optical microscope （OM）, scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. The refinement process was simplized. It was shown that the alloy grains could be refined by addition of the refiners apparently even at high pouring temperature. The average grain size of the refiner free alloy was 4 mm, and 0.4 mm for the refined alloy. The fine-grain superalloy has excellent mechanical properties at intermediate temperature. The refinement mechanism was discussed.

关键词： Superalloy Refiner Grain refinement Microstructure

Effect of Minor Alloying on Crystallization Behavior and Thermal Properties of Zr_(64.5)Ni_(15.5)Al_(11.5)Cu_(8.5) Bulk Amorphous Alloy

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Journal of Materials Science & Technology 2011年第6期27卷 534-538页

作者： Muhammad Iqbal Javed Iqbal Akhter Haifeng Zhang zhuangqi hu MicrostructuralStudies Group Physics Division Pakistan Institute of Nuclear Science and Technology (PINSTECH) P.O. Nilore Islamabad Pakistan Shenyang Nationel Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Minor alloying plays an important role in the synthesis and improvement of thermal stability of bulk metallic glasses（BMGs）.The present study was conducted to investigate the effect of minor additions of Y,Ti and Nb on the crystallization behavior and the thermal properties of Zr64.5Ni15.5Al11.5Cu8.5 *** parameters and the activation energies for crystallization were calculated for four（Zr0.645Ni0.155Al0.115-Cu0.085）100-xMx（M=Y,Ti and Nb,while x=0,2 at.） *** present alloys have wide supercooled liquid region of ≥87 *** activation energy was found to be greater than 300 kJ/mol for the base *** crystalline phases were identified in the samples annealed at 823 K for 20 *** glass transition temperature（Trg） and other thermal parameters such as γ,δ and β were improved by Y and Ti *** addition resists crystallization below annealing temperature 713 K,however,its effect on thermal properties is not very promising.

关键词： Activation energy Thermal properties Glass-forming ability Thermal stability Precipitation Microstructure