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STABILITY OF NANOCRYSTALLINE Ni-P RIBBONS

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Acta Metallurgica sinica(English Letters) 1993年第8期6卷 108-111页

作者： SHUI Jiapeng CHENG Lifang LIU Junmin CHU Zhaoqin institute of solid state physics,academia sinica,hefei,china associate professor,institute of solid state physics,academia sinica hefei 230031,china Inst of solid state physics Acad Sinica Hefei China

Stability of nanocrystalline Ni-P ribbons was investigated by DSC and internal friction *** nanocrystalline Ni-P ribbons seem to be unstable within range of 518 to 887 K owing to obvious exothermal phenomenon,decremen... 详细信息

关键词： nanocrystal Ni-P DSC internal friction stability

EXTENSION OF solid SOLUBILITY BY MECHANICAL ALLOYING IN Fe-Cu SYSTEM

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Acta Metallurgica sinica(English Letters) 1993年第2期6卷 92-95页

作者： YANG Yuanzheng MA Xueming DONG Yuanda institute of solid state physics,academia sinica,hefei,china Professor.institute of solid state physics Academic sinica,hefei 230031,china Inst of solid physics Acad Sinica Hefei China

Mechanical alloying was employed to produce super—saturated solution of Fe_1-xCu_x ,which is virtually immiscible under an equilibrium condition at ambient *** results show that the solutions formed in the concentration ranges of x≤O.15 and x≥0.40 are of bee structure of x-Fe and fee structure of Cu,*** the region in between (0.15solid solutions.

关键词： mechanical alloying Fe-Cu immiscible system super-saturated solid solution

MECHANICAL REDUCTION OF CuO BY Mg AT ROOM TEMPERATURE

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Acta Metallurgica sinica(English Letters) 1992年第3期5卷 218-220页

作者： MA Xueming YUE Lanping DONG Yuanda institute of solid state physics,academia sinica,hefei,china Inst of solid state physics Acad Sinica Hefei China

The mechanical reduction of CuO by pure metallic Mg has been investigated during pulver- izing in ball mill at room *** reduction was towards its completion of an average particle size down to 20 nm after milling for 32 *** mechanism of the mechanical reduction of oxides seems to be the surface activation of nano-metre sized particles driven by mechani- cal force.

关键词： CuO Cu mechanical reduction Mg

CHARACTERISTICS OF INTERNAL FRICTION AND MODULUS ASSOCIATED WITH NON-EQUILIBRIUM DIFFUSION-TYPE PHASE TRANSFORMATION IN EUTECTOID Al-Zn ALLOY

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Acta Metallurgica sinica(English Letters) 1989年第5期2卷 315-319页

作者： zhu xianfang ZHANG Lide institute of solid state physics,academia sinica,hefei,china Research Assistant,institute of solid state physics,academia sinica,hefei,china

The characteristics of the low frequency internal friction and the modulus effect associated with the non-equilibrium spinodal pretransformation and the following discontinuous trans- formation was investigated in an as-quenched eutectiod Al-Zn *** was observed that the loss of the stability in the lattice,which corresponded to the large-amplitude long-wavelength static concentration wave in the non-equilibrium spinodal pretransformation,did not induce any effect of localized soft *** there are two aging internal friction peaks in phase transformation which correspond to the appearance and disappearance of the coherency in spinodal pretransformation and the maximum of the interface area in the discontinuous transformation respectively,the effect of localized soft modulus did not take place yet.

关键词： spinodal pretransformation soft modulus discontinuous transformation internal friction

Structural Characteristics of Rapidly Quenched Al-Si Alloys

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Journal of Materials Science & Technology 1994年第3期10卷 232-234页

作者： Lin LIU(institute of solid state physics, academia sinica, hefei, 230031, china)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, china) Inst of solid state physics Academia Sinica Hefei China

The structure of rapldly quenched Al-Si alloys (1 and 4 wt-%Si) was systematically studied by optical and transmission electron microscopy (TEM ) as welI as X-ray djffractjon (XRD). ExperimentaIresults show that rapid solidification refines the grain size. extends the solid solubility of Si in Al and Introduces a high density ot defects which exist in the forms of vacancies, dislocations and dislocation loops. etc.. The decomposition process of the alloys was fol lowed by using differential scanning calorimeter (DSC) and the activation energy for precipitation of Si was obtained through Kissinger analysis. The precipitation behaviour of Supersaturated Si in both samples was further examined by TEM. It was found that Si mainly precipitated inside the grains in Al-1 wt-%Si alloy. while in Al-4 wt-%Si alloy. nearly all the Si precipitates distributed along the grain boundaries. This may be due to the structure difference between the alloys in as-quenched state

关键词： Al Si Structural Characteristics of Rapidly Quenched Al-Si Alloys

Crystal Structure during Film Formation

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Journal of Materials Science & Technology 1994年第2期10卷 117-120页

作者： Guoping DU Hui SHEN Lanping YUE Weiguo YAO Zongquan LI and Zhenzhong QI (institute of solid state physics, academia sinica, hefei, 230031, china)(To whom correspondence should be addressed) Acad sinica Hefei China

For evaporation-deposited Ti films, face-centred cubic structure was observed at the initial stage of film growth, then transited to the hexagonal close-packed structure during film growing (less than 50 nm thick). While. for ion-beam sputter-deposited films. the structure of films always kept the fcc structure during all stages of film formation. The structure of film at initial growth stages relates with the substrate. It is discussed that different film processes and different growth stages provide different thermodynamic condition of film formation and result in the different crystal structures of films during the film formation

关键词： NaCl Crystal Structure during Film Formation nm

Grain Growth Kinetics and Debye Temperature of Nanometer TiO_2 Powders Prepared by a Sol-gel Process

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Journal of Materials Science & Technology 1994年第3期10卷 213-216页

作者： Ju LUO Xingzhao DING Benpei CHEN and Jie KONG(institute of solid state physics, academia sinica, hefei, 230031, china)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, china) Inst of solid state physics Academia Sinica Hefei China

The development of microstructure of nanometer TiO2 powders prepared by a sol-gel process was systematically studied. Grain growth was mon itored using X-ray diffraction (XRD) and transmission electron microscopy (TEM). and the Debye temperature of anatase crystallites was determined. It was found that the grain size of the powders increased slowly with annealing temperature up to 773 K. but grew rapidly in the temperature range of 773-1273K. The activation energies (Ea) for the growth of anatase crystallites in the two temperature regions were calculated to be 16 and 90 kJ / mol, respectively. The Debye temperatures of nanocrystalline anatase powders were all lower than that of microcrystalline anatase. which implies that the bonding force between Ti and O atoms in nanocrystalline TiO2 shourd be smaller than that in microcrystalline state. However. it was noted that the Debye temperature of nanocrystalline anatase increased with the decrease of grain size. This may be attributed to the enhancement in atomic bonding force due to the existence of high surface tension in nanocrystalline powders

关键词： Powders

EFFECT OF SLIP ORIENTATION ON STRESS RESPONSE,INTERNAL FRICTION AND ULTRASONIC ATTENUATION DURING CYCLIC DEFORMATION IN Al SINGLE CRYSTALS

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Acta Metallurgica sinica(English Letters) 1992年第6期5卷 471-476页

作者： XIA Yuebo ZHANG Tianyi state Key Laboratory for Fatigue and Fracture of Materials,institute of Metal Research,academia sinica,Shenyang,chinaFEI Guangtao ZHOU Xing Laboratory of Internal Friction and Defects in solids,institute of solid state physics,academia sinica,hefei,china Associate Professor,institute of Metal Research,academia sinica,Shenyang 110015,china Inst of Metal Research Acad Sinica Shenyang China

The variation of cyclic stress,internal friction and ultrasonic attenuation during cyclic deformation and relations among them have been investigated with different slip orientation Al single *** results indicate that the value of cyclic stress σ,internal friction Q^(-1)and ultrasonic attenuation △α depend obviously on the slip *** are large differences in above three parameters for different slip orientation Al *** early stage of fatigue life,σ and △α increase and Q^(-1)decreases with cycles N,and △α reached maxi- mum before σ,while Q^(-1)and σ get the valley and the peak,respectively,at same cycles.

关键词： crystal orientation cyclic deformation stress response internal friction ultrasonic attenuation Al

HARDENING BEHAVIOUR OF STAINLESS STEEL 316 DURING FATIGUE WITH THERMAL PULSE

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Acta Metallurgica sinica(English Letters) 1992年第4期5卷 301-304页

作者： YAN Shichun institute of solid state physics,academia sinica,hefei,chinaOKUDA Shigeo MIZUBA YASHI Haka institute of Materials Science,University of Tsukuba,Japan Inst of solid state physics Acad Sinica Hefei China

The softening of stainless steel 316 of non-detectable difference in magnitude induced by thermal pulse was found during fatigue with strain amplitude of 1.17×10^(-4) in temperature range of 333—*** it occurred if the measurements of fatigue with thermal pulse were performed in range of 333—***,it will become of the hardening in range of 503 —*** temperature,at which hardening of the steel induced by thermal pulse emerges in fatigue process,increases with the increasing in strain amplitudes.

关键词： fatigue hardening softening thermal pulse stainless steel