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MAGNETIC PHASE DIAGRAM OF SmMn_2(Ge_(1-x)Si_x)_2 SYSTEM

Y.G. Wang , F.M Yang , C.P. Chen , N Tang , and Q.D. Wang (State Key Laboratory of Magnetism , Institute of Physics , Chinese Academy of Sciences , P.O. Box 603 , Beijing 100080 , China)(Department of Materials Science and Engineering , Zheiang University Hangzhou 310027 , China)

金属学报(英文版)

The magnetic phase diagram (x,T) of the SmMn2(Ge1-xSix)2 system has been studied by susceptibility and magnetization measurement. With increasing silicon concentration the temperature region of ferromagnetic ordering decreases on the phaae diagram.

关键词: magnetic phase diagram , null , null , null

A Preliminary Raman Investigation of the Lead Titanate Thin Films via Sol-Gel Process

Tao ZHU , Gaorong HAN , Gaoling ZHAO and Zishang DING(Dept. of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China)( State Key Lab. of Magnetism , Institute of Physics , Chinese Academy of Sciences , P.O.Box 603 , Beijing 100080 , China)

材料科学技术（英）

Raman spectra of the PbTiO3 films via sol-gel process were investigated by using a Jobin Yvon U1000 system. Compared with the Raman spectra of the PbTiO3 single crystals, Raman peaks of PbTiOs films shift downward, which is attributed to the stress effect in the PbTiO3 films exerted by the substrate and the size effect on the Raman frequencies

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EFFECT OF OXIDE LAYER THICKNESS OVER Al AND Al ALLOY POWDERS ON QUALITY OF THEIR EXPLOSIVE COMPACTS

ZHANG Dengxia MA Chenghui CAI Ming Institute of Mechanics , Academia Sinica , Beijing , ChinaAI Baoren ZHANC Jinyuan ZHU Ruizhen LIU Chunlan Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China Associate Professor , Institute of Mechanics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

Observations of microstructure of explosive compacts made of Al or Al-Li alloy powders by atomization with water,nitrogen or ultrasoic Ar gas were carried out under optical and scanning electron microscopes.The rsults indicate that super quality explosive compact can only be obtained by powders of which the thickness of the oxide layer is less than 30 nm.

关键词: Al powder , null , null , null

EFFECT OF CRACK CLOSURE ON SLOW PROPAGATION IN DUAL-PHASE STEEL

DENG Rongying , YE Zhijun Institute of Mechanics , Academia Sinica , Beijing , China LIU Shuhua , ZOU Dingqiang China Academy of Railway Sciences , Beijing , China Institute of Mechanics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

The effect of ferrite content in ferrite-martensite dual-phase steel on the initiation and prop- agation of fatigue crack and the plastic deformation at crack tip has been studied.In the range of ferrite content from 24.2 to 41.5%,the optimum seems to be 33.8%,of which the crack ini- tiation will be prolonged,the threshold value increased,the propagation rate decreased and the closure stress intensity factor increased.As the propagation force is described by effective stress intensity factor,three steels with various ferrite contents will show the same propagation behaviour on da/dN vs △ K_(eff)curve.It is shown that the closure effect increases with the decrease in △K at the fatigue crack tip.When △K equals to △K_(th),the closure effect reaches a maximum value of0.7 in a dual-phase steel with 33.8%ferrite.

关键词: dual-phase steel , null , null

EFFECT OF FINE GRINDING ACTIVATION ON LEACHING BEHAVIOUR OF SCHEELITE CONCENTRATE

LI Ximing CHEN Jiayong Institute of Chemical Metallurgy , Academia Sinica , Beijing , ChinaR.KAMMEL Institut Für Metallurgie , Technische Universitt Berlin , Germany Research Assistant , Institute of Chemical Metallurgy , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

The influence of mechanical activation on the leaching behaviour of scheelite was studied by means of fine grinding in an attritor and subsequently HCl leaching in presence of PO_4~(3-). Results showed that after fine grinding in the attritor,the reaction rate of scheelite with HCl-Na_3PO_4 solution was remarkably increased,the extraction of W increased from about 8 to 99%.The IR spectra and X-ray diffraction analysis indicated that in addition to an enlargement of surface area the fine grinding action had made also changes of fine struc- ture and reactivity of solid surface,hence the leaching process of scheelite can be carried out under mild leaching conditions.

关键词: scheelite , null , null , null

PHASE DIAGRAM OF Bi-Pb-T1 TERNARY SYSTEM

CHE Guangcan Institute of Physics , Academia Sinica , Beijing , ChinaM.ELLNER Max-Planck Institut for Metallforschung , Stuttgart , Germany Associate Professor , Institute of Physics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

Isothermal section at 25℃ of phase diagram and phase structure of Bi-Pb-Tl ternary system have been studied by means of room and high temperature X-ray diffraction and quenching.

关键词: ternary system , null , null , null , null

CHARACTERISTIC TRANSITION TEMPERATURE OF BRITTLENESS OF LOW CARBON STEEL

HUANG Zheng Institute of Physics , Academia Sinica , Beijing , ChinaYAO Mei Harbin Institute of Technology , Harbin , China Institute of Physics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

On the basis of analysis of low carbon steel fracture macro-features and micro-processes at low temperature,the definition was given of the characteristic transition temperature of brittleness,T_(pm),and its physical meaning was expounded.Discussion was carried out of phys- ical characteristic of variation at T_(pm) in respect of the fracture toughness and property of crack arrest.In addition,research was made on the application of T_(pm),which can give infor- mation about the transition of the fracture toughness,the property of crack arrest and critical crack size,to estimation the brittleness of low carbon steel at low temperatures.

关键词: low carbon steel , null , null , null , null

EFFECT OF EXPLOSIVE CONSOLIDATION PARAMETERS ON CONSOLIDATION QUALITY

GAO Juxian ZHANG Ke ZHENG Zhemin Institute of Mechanics , Academia Sinica , Beijing , China GAO Juxian Associate Professor , Institute of Mechanics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

Two-dimension consolidation under the cylindrical converging shock wave has been studied. The major parameters influenced on the explosive consolidation quality are the specific energy,detonation pressure and specific impulse.It seems to be favourable to improving con- solidation quality by a lower but slightly higher than critical detonation pressure and a high specific impulse.

关键词: explosive consolidation , null , null

DESIGN OF A/AD_m-BC_n DIRECTIONAL EUTECTIC COMPOSITES

S.P.Li.S.X. Zhao , X.H Yu , M .X. Pan , D.Q.Zhao and X.C.Chen (Institute of Physics Chinese Academy of Sciences , Beijing 100080 , China)O.M Barabash(Institute of Metal Physics , Kiev 252142 , Ukraine)(Manuscript received 9 February 1996)

金属学报(英文版)

Design process of A/ADm-BCn type directional eutectic composites was instanced by investigating Al-Mg-Si-Li and Ni-Mo-C-Al systems in this study by thermoanalysis and directional solidification techniques. It was demonstrated that A(D)-BCn eutectic alloys could be obtained more conveniently by using Smith′s thermoanalysis method to trace change of the eutectic Points of A-BCn induced by addition of components D. A/ADm-BCn directional eutectic composites could be produced from directionally solidified A/ADm-BCn alloys after proper heat treatments if components D have higher solid solubility in components A at high temperature and stable of metastable phases ADm could be formed at room temperature.

关键词: :solidification temperature scale , null , null

SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS

HOGN Youshi LU Yonghua ZHENG Zhemin Institute of Mechanics , Academia Sinica , Beijing , China Institute of Mechanics , Academia Sinica , Beijing 100080 , China

金属学报(英文版)

Fatigue tests were made on a vibration machine using specially designed specimens to investi- gate the initiation and propagation features of short fatigue cracks in a weld metal.The spec- imens were triangular in shape so that when loaded as a cantilever beam the surface tensile stress is constant.Test results show that short fatigue cracks mainly originate from slip bands within ferrite grains.The development of short fatigue cracks is marked by a gradual increase in crack density with fatigue cycles.Coalescence of short cracks leads to crack propagation and the crack path is predominantly transgranular.

关键词: iso—stress specimen , null , null

材料期刊网

MAGNETIC PHASE DIAGRAM OF SmMn_2(Ge_(1-x)Si_x)_2 SYSTEM

A Preliminary Raman Investigation of the Lead Titanate Thin Films via Sol-Gel Process

EFFECT OF OXIDE LAYER THICKNESS OVER Al AND Al ALLOY POWDERS ON QUALITY OF THEIR EXPLOSIVE COMPACTS

EFFECT OF CRACK CLOSURE ON SLOW PROPAGATION IN DUAL-PHASE STEEL

EFFECT OF FINE GRINDING ACTIVATION ON LEACHING BEHAVIOUR OF SCHEELITE CONCENTRATE

PHASE DIAGRAM OF Bi-Pb-T1 TERNARY SYSTEM

CHARACTERISTIC TRANSITION TEMPERATURE OF BRITTLENESS OF LOW CARBON STEEL

EFFECT OF EXPLOSIVE CONSOLIDATION PARAMETERS ON CONSOLIDATION QUALITY

DESIGN OF A/AD_m-BC_n DIRECTIONAL EUTECTIC COMPOSITES

SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS

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