材料期刊网

PREPARATION OF ULTRAFINE POWDER OF Fe AND ZrO_2 WITH METASTABLE PHASES BY HIGH POWER LASER BEAMS

XU Huibin TAN Shusong Technische Universitat Berlin , FRG XU Huibin Dipl.-Ing , FB9 , Physikalische Ingenieurwissenschaft , HF1 , TU Berlin , 1000 Berlin 12 , FRG

金属学报(英文版)

The radiation of material surface by high intensity laser beams is used to produce the uhrafine powder of pure Fe and ZrO_2.The morphology,size and phases of the powder were examined by X-ray diffraetometer,scanning electron microscopy as well as transmission electron microscopy.In pure Fe a considerable quantity of γ-phase was found in the powder.In ZrO_2 powder,instead of stable phase,two metastable phases appeared.

关键词: laser beam , null , null

Professor XU Zhong-yu and his research activities

新型炭材料

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On the Indeterminacy in Hardness of Shape Memory Alloys

F.T.Cheng

材料科学技术（英文）

The present communication addresses an interesting problem related to the indeterminacy in hardness of superelastic NiTi reported by Xu et al. The origin of the indeterminacy is attributed to the inadequacy of the conventional Vickers hardness testing measurement which does not record elastic deformation, and thus the indeterminacy may be removed with suitable techniques. Concepts of hardness in relation to deformation are clarified. Recommendations for measuring the hardness of NiTi and other elastic-plastic materials are suggested, together with comments on the advantages and disadvantages of each of these methods.

关键词: Hardness , null , null , null , null , null

Broer-Kaup-Kupershmidt方程的新精确解

杨立娟 , 杨琼芬 , 杜先云

量子电子学报 doi:10.3969/j.issn.1007-5461.2012.02.003

CK方法是求解非线性发展方程的一种有效的直接方法.利用推广的CK方法,求得(2+1)维Broer-Kaup-Kupershmidt方程的Backlund公式,从而获得方程的大量新的精确解,推广了Xu和Zhang的结果.

关键词: 非线性发展方程 , Broer-Kaup-Kupershmidt方程 , 精确解 , CK方法 , Backlund变换

Thermodynamic analyses of strain-induced martensite transformation in Fe-7Mn-1.2C alloy

Jingpei XIE , Yaomin ZHU , Xiaoping WANG

材料科学技术（英文）

The M-s temperature, Delta G(gamma-->alpha), Delta G(gamma-->M) and mechanical energy under a non-severe impact loading in a medium manganese steel (Fe-7Mn-1.2C) have been calculated by means of Xu's Fe-X-C model. The relation between the yield strength of austenite and the driving force for martensite transformation has been established. It is proved that the martensite transformation can take place in a medium manganese steel (Fe-7Mn-1.2C alloy) under a non-severe impact loading.

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磷在12Cr1MoV钢中非平衡晶界偏聚动力学的实验研究

李莉 , 李庆芬 , 郑磊 , 徐庭栋 , 杜善义

钢铁研究学报

以工业用12Cr1MoV钢为研究对象,通过俄歇电子能谱分析方法(AES),对磷在恒温过程中的非平衡晶界偏聚浓度进行了测定.获得的磷在钢中的非平衡晶界偏聚动力学曲线直接验证了非平衡晶界偏聚动力学理论中的Xu-Song模型.

关键词: 晶界偏聚 , 临界时间 , 扩散 , 钢

Nucleation and Formation of Stable and Metastable Phases in Undercooled AI-Li Melts

Shenglong DAI Guifu YU Minggao YAN Institute of Aeronautical Materials , Beijing , 100095 , China

材料科学技术（英文）

A modified nucleation and competitive growth kinetic theory considering unsteady nucleation and effect of composition in dilute binary alloys was suggested,based on which the selections of δ.δ' and α phases in undercooled Al-Li melts were summarized by both isothermal and continuous cool- ing treatment methods.

关键词: undercooling , null , null

HIGH-TEMPERATURE ISOPIESTIC STUDIES ON Hg-Pb BINARY AMALGAM

ZHANG Xinhua HE Yuzhi BAO Yuhong WANG Zhichang Shanghai Institute of Nuclear Research , Academia Sinica , Shanghai , China ZHANG Xinhua , Shanghai Institute of Nuclear Research , Academia Sinica , Shanghai , China

金属学报(英文版)

The activities of mercury in the Hg-Pb binary amalgam were measured at 600 K using a high-temperature isopiestic method.The activities of lead in the amalgam were calculated us- ing Gibbs-Duhem integration.

关键词: Hg-Pb , null

CHARACTERIZATION OF Sil-x-yGexCy FILMS GROWN BY ION IMPLANTATION AND SUBSEQUENT SOLID PHASE EPITAXY

X.Q.Liu , Y.Y.Wang , W.J.Cheng

金属学报(英文版)

Si1-y-GexCy ternary alloy films were grown on monocrystalline silicon substratesby C+ ion implantation and subsequent solid phase epitaxy (SPE). Two-step anneal-ing technique was employed in the SPE. The structure and electrical properties of thealloy films were determined using Fourier transform infrared spectroscopy and vander Pauw Hall measurements, respectively. With the optimization of two-step anneal-ing technique for the implanted Si1-x-y GexCy layers, a certain amount of C atomsoccupied substitutional sites and no SiC was formed.

关键词: Si1-x-yGex Cy film , null , null

EUTECTIC GROWTH OF CAST IRON UNDER RAPID SOLIDIFICATION

GUO Jingjie JIA Jun LI Qingchun LI Bangsheng Harbin Institute of Technology , Harbin , China

金属学报(英文版)

The eutectic growth of cast iron during rapid solidification has been studied with laser remelt- ing and deep etching technology.A new mode of mushroom eutectic growth was observed oth- er than the usual honeycomb and lamellar ones.The mushroom eutectic growth may finally form the lamellar dendritic structure.

关键词: cast iron , null , null