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Improved hydrogenation-dehydrogenation characteristics of nanostructured melt-spun Mg-10Ni-2Mm alloy processed by rapid solidification

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Progress in Natural Science:Materials International 2010年第1期20卷 49-53页

作者： Na XING,Ying WU,Wei HAN,Shao-xiong ZHOU china iron & steel {3. Group,Advanced Technology & Materials Co.,Ltd.,beijing 100081,china china iron & steel {3. Group Advanced Technology & Materials Co. Ltd. Beijing 100081 China

The as-cast Mg-10Ni-2Mm(mole fraction,%)alloy was prepared by a simple and low-cost two-step method of pre-alloying and vacuum induction *** nanocrystalline alloy was obtained by the melt-spun process with the surface velocity of copper wheel of 10.5 m/*** hydrogen storage properties were examined by PCT *** enthalpy(ΔH)and entropy(ΔS)of the alloy determined by van’t Hoff plots indicate that the thermodynamic performance of the nanocrystalline alloy is improved by fast diffusion ability of hydrogen in the nanocrystalline microstructure embedding nano-particles of intermetallics compounds Mg2Ni and *** reaction kinetics of the melt-spun alloy is greatly improved due to short diffusion path of hydrogen in the nanocrystalline microstructure,resulting in better overall hydrogen storage *** hydrogen storage capacity is 5.09%(mass fraction,hereinafter the same),and the amount of hydrogen desorption is 4.86%.The hydrogen desorption rate of 95.5%in the alloy is available.

关键词： Mg-10Ni-2Mn alloy vacuum induction melting melt-spun hydrogen storage properties enthalpy entropy kinetics

IN SITU OBSERVATION ON FORMATION OF BASKET DURING BAINITIC TRANSFORMATION

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Acta Metallurgica Sinica(English Letters) 1989年第4期2卷 298-300页

作者： WANG Yingshu SUN Fuyu XU Wenchong central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china Senior Engineer,Department No.13.central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china

By means of riM-190 hot-stage microscopy,the in situ observation of α-β transformation in 12Cr2MoWVTiB steel has been carried *** sequence of the growth of ferritic needles composing bainitic basket has also been *** to the crystallographic analy- sis a multislip system transform model concerning the formation of basket has been proposed.

关键词： α-β transformation steel 12Cr2MoWVTiB ferritic needles basket

INTERACTION OF Ce AGAINST Cu,P OR Ti IN Fe-BASE SOLUTION

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Acta Metallurgica Sinica(English Letters) 1990年第12期3卷 435-438页

作者： WANG Yuekui DU Ting central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china

The equilibrium product in Fe-Cu-Ce,Fe-P-Ce or Fe-Ti-Ce solution have ben Mentified to be Ce_2O_2S,but not the intermetallic compounds of Ce against Cu,P or *** equilibrium eonstant of Ce_2O_2S=2[Ce]+2[O]+[S] and the interaction coefficients between solutes in Fe-base solution have been determined as follows: K_(Ce_2O_2S)=2.57×10^(-5) e_(Ce)^(Cu)=-0.49;e_(Ce)~P=1.77;e_(Ce)^(Ti)=-3.62 e_(Cu)^(Ce)=-0.22;e_P^(Ce)=0.3.;e_(Ti)^(Ce)=-1.23.ε_(Ce)^(Cu)=-128.0;ε_(Ce)~P=-224.1;ε_(Ce)^(Ti)=-710.0 Ce decreases the activities of Cu and Ti in Fe-base solution and increases their solubifities,as well as increases the activity of P and decreases its solubility.

关键词： Fe-base solution Ce Cu P Ti interaction oxygen activity

Effects of temperature and rare earth content on oxidation resistance of Ni-based superalloy

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Progress in Natural Science:Materials International 2011年第3期21卷 227-235页

作者： Xiu SONG~1,Lei WANG~1,Yang LIU~1,Hui-ping MA~2 1.Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110004,china 2.Department of High-temperature Materials,central iron & {3. research institute,beijing 100081,china [a] Key Laboratory for Anisotropy and Texture of Materials Northeastern University Shenyang 110004 China [b] Department of High-temperature Materials Central Iron & Steel Research Institute Beijing 100081 China

The oxidation behaviors of the Ni-22Cr-14W-2Mo superalloys with various La contents were investigated at 1 000℃and 1 100℃up to 500 *** experimental results show that the oxidation resistance is improved by La *** mechanism of the reactive-element effect（REE） exhibits some difference at various oxidation *** REE is dependent on the solutionized La content when the alloy is oxidized at 1 000℃.The dispersed LaCrO3.egregates on the grain boundaries of *** hence the diffusion of metallic ions,e.g.,Mn2+and Cr3.,are *** oxidation resistance decreases with the increase of La content. However,the REE ascribes not only to the solutionized La,but also to the La-Ni intermetallic phases,when the alloy is oxidized at 1 100℃.The oxidation resistance is influenced by two effects:firstly,the formation of the dispersed La2O3.rom the solutionized La on the grain boundary of Cr-oxides reduces the oxidation rate,and secondly,the aggregation of the La-O oxides from the large amount of La-Ni phases accelerates the oxidation *** alloy with 0.026%La（mass fraction） exhibited excellent oxidation resistance at 1 100℃.

关键词： Ni-based superalloy isothermal oxidation rare earth La oxidation resistance

EFFECT OF AUSTENITE DEFORMATION ON ISOTHERMAL INCUBATION TIME OF PROEUTECTOID FERRITE NUCLEATION

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Acta Metallurgica Sinica(English Letters) 1991年第3期4卷 161-164页

作者： LI Jian SUN Fuyu central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china

A calculation method for the isothermal nucleation incubation time of pro-eutectoid ferrite formed from deformed austenite has been developed by introducing Feder's incubation time expression into the decomposition of deformed *** effects of austenite deformation stored energy and austenite grain boundary energy change on the incubation time have been theoretically calculated and the rule of calculated results is consistent with that of experiments,this confirms that austenite deformation stored energy and the change of austenite grain boundary energy are the natural effect of austenite deformation on ferrite nucleation.

关键词： deformed austenite ferrite incubation time

CRACK INITIATION AND STEADY PROPAGATION OF ELASTIC-PLASTIC MATERIALS IN PLANE STRESS CONDITION

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Acta Metallurgica Sinica(English Letters) 1989年第5期2卷 354-358页

作者： ZHUANG Tao WANG Zhongfang central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing Dept.No.13.central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china

The crack tip stress-strain fields of the elastic-plastic cracked specimens have been analyzed using finite element *** crack initiation and steady propagation behaviours have also been investigated by means of slip line pattern etching technique and mechanical tests. The results show that there are HRR near field and distant field in the crack tip region,and the later depends on the specimen *** crack initiation behaviour is controlled by a single parameter *** contrast,the steady crack propagation is affected by the distant strain field and can not be described by single parameter only.

关键词： plane stress elastic-plastic material crack propagation steel 00Cr14Ni14Si4

A new criterion for predicting glass forming ability of bulk metallic glasses and some critical discussions

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Progress in Natural Science:Materials International 2011年第2期21卷 164-172页

作者： Bang-shao DONG,Shao-xiong ZHOU.De-ren LI,Cao-wei LU,Feng GUO,Xiao-jun NI,Zhi-chao LU Advanced Technology & Materials Co.,Ltd.,central iron & steel {3. institute,beijing 100081,china Advanced Technology & Materials Co. Ltd. Central Iron & Steel Research Institute Beijing 100081 China

A modified criterion,β’,defined as Tg/Tx-Tg/(Tl·η))(Tg,Tx,Tlandηdenote the glass transition temperature,the onset of crystallization temperature,the liquidus temperature and constant coefficient,respectively),has been proposed for assessing the glass-forming ability(GFA) of bulk metallic glasses(BMGs).A survey of the readily available experimental data associated with the thermal analysis of various BMG alloys demonstrates that the newβ’ criterion exhibits much better correlation with the GFA than other currently used ***,it is more significant from statistical results to note that,all criteria including the currently proposed criterionβ’,which are all combined by Tg,Txand Tl,almost have equal ability in measuring the glass forming ability in any glass-forming system.

关键词： amorphous materials metallic glasses glass-forming ability thermal analysis criterion

MICROSTRUCTURE OF SILICON CARBIDE WHISKERS

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 211-218页

作者： XU Haigang ZHU Jing YUAN Hong central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,chinaNING Xiaoguang YE Hengqiang Laboratory of Atomic Imaging of Solids,institute of Metal {3.,Academia Sinica,Shenyang,china central iron and steel {3. Inst Beijing China

The morphology,crystal defects and chemical compositions of surfaces in two kinds of SiC whiskers related to their growth mechanism have been studied by means of electron microscopy and surface chemical *** upon the experimental results,five criteria for evaluating the whisker microstructure were suggested as:proportion of the perfect single crystals,morphology and dimensions,defects and their distribution,the bulk and surface chemistries,and crystallographic characteristics.

关键词： SiC whisker microstructure defect

STRAIN-INDUCED ISOTHERMAL PRECIPITATION OF Nb,V AND Ti CARBONITRIDES IN MICROALLOYED steelS DURING CONTROLLED ROLLING

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Acta Metallurgica Sinica(English Letters) 1989年第3期2卷 174-180页

作者： XU Wenchong MA Xiang SUN Fuyu ZONG Guisheng central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china XU Wenchong,Senior Engineer,Department No.13.central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china

The strain-induced isothermal precipitation and the law of coarsening of Nb,V and Ti carbonitrides in ***-V steel and Ti-V-Nb steel have been investigated systematically by means of STEM,EDAX,a new extraction replica ... 详细信息

关键词： microalloyed steels controlled rolling isothermal precipitation carbonitride