材料期刊网

Microstructural Characteristics and Stability in a Rapidly Solidified Al-Fe-Nb-Si Alloy

Shaokang GUAN and Ningfu SHEN(Dept. of Materials Science and Engineering , Zhengzhou University of Technology , Zhengzhou 450002 , China) Yulin GONG(Central China Petroleum and Natural Gas Development Corporation of Henan Province , Zhengzhou 450002 , China)Ha

材料科学技术（英）

The microstructure and stability in a rapidly solidified Al-Fe-Nb-Si alloy were studied by using transmission electron microscopy (TEM) with energy dispersive X-ray spectrometry (EDXS) and X-ray difFraction technique. It is shown that the addition of Nb to Al-Fe-Si alloy may increase undercooling of melt, and form the featureless zone structure, the size of the intercellular phases and the distance betWeen intercellulars of Al-Fe-Nb-Si alloy are two times smaller than that of Al-Fe-V-Si alloy under the same conditions. Further, the microstructure of the featureIess zone has the better thermal stability after annealing at 623 K for 24 h.

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Introduction to atmospheric corrosion research in China

Science and Technology of Advanced Materials

In this paper, we introduce the research on atmospheric corrosion in China. We describe the climate characteristics and the classification of atmospheric corrosivity across the whole country. We also describe the rusting evolution under simulated wet/dry cyclic conditions. (C) 2007 NIMS and Elsevier Ltd. All rights reserved.

关键词: atmospheric corrosion;corrosivity;rusting evolution;weathering steels;rust;mechanism;so2;o-3;no2

Recent Advances of Laser Coating Technology in China

LIANG Yong LI Ruiguo Institute of Metal Research , Academia Sinica , Shenyang 110015 , ChinaInstitute of Corrosion and Protection of Metals , Aademia Sinica , Shenyang , 110015 , China

材料科学技术（英）

Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.

关键词: laser , null , null , null , null

Development of Cast Superalloys for Gas Turbines in China

CHEN Rongzhang CHEN Wanhua Institute of Aeronautic Materials , Beijing 100095 , China.

材料科学技术（英）

As in other countries,significant achievements in the research of cast superalloys for many years have also been obtained in China.These results are important contribu- tion to the development of aero and land-based gas tur- bine engines.

关键词: cast superalloy , null

R&D STATUS ON INTERMETALLICS IN CHINA

CHEN Guoliang(State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 , China)SHI Changxu (Academia Sinica , Beijing 100864 , China)

金属学报(英文版)

This paper briefiy introduces the R&D of intermetallics in China. R&D on intermetallics in a national scale in China began near ten years ago. The investigation in past years focused on the fundamental research and materials development. A significant progress has been made. Various components that made of Ti3Al Ni3Al, TiAl and Fe3Al have been successfully manufactured Some of them have been evaluted. It is expected that some intermetallic alloys will be produced in an industrial scale in the near future.

关键词: :intermetallic alloys , null , null , null

Further development of NdFeB magnet industry in China

Yang LUO

材料科学技术（英）

Due to continued growth in key markets, a broadening of application base and performance improvements, the market demands of NdFeB magnet increased steadily in 1998, and the global output of sintered NdFeB magnet exceeded 10,000 t, in spite of the economic recession in Asia. In 1998 China produced 3,850 t sintered NdFeB block magnet, with an annual growth rate of +22% over the output in 1997.

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晶化处理对HA/(HA+TiO2)涂层组织结构的影响

王志刚 , 朱瑞富 , 吕宇鹏 , 李士同

材料热处理学报 doi:10.3969/j.issn.1009-6264.2005.03.030

用X射线衍射仪(XRD)、电子探针(EPMA)等检测手段,以晶化处理对大气等离子喷涂法在纯钛表面制备的HA/(HA+TiO2)复合涂层为研究对象,探讨了晶化处理对HA/(HA+TiO2)涂层组织结构和成分分布的影响.结果表明:晶化处理后HA/(HA+TiO2)涂层结晶度明显提高;(HA+TiO2)过渡层中交替分布的HA和TiO2结合致密;涂层表面裂纹比对应纯HA涂层细小,涂层内部结合致密,证实TiO2的加入具有缓和应力的作用.

关键词: 羟基磷灰石(HA) , 等离子喷涂 , 复合涂层 , 晶化

Development of rapidly quenched soft magnetic materials in China

Shaoxiong ZHOU

材料科学技术（英）

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in China is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

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Recent developments in high temperature intermetallics research in China

Intermetallics

A comprehensive survey was made of various advances of intermetallics research in China. The investigation focussed on the fundamental research and materials development. Charge density distribution and site occupancy of alloying elements, environmental embrittlement and chemical reaction, interface structures and phase transformation at the atomic scale, nanocrystalline intermetallics and its thermal stability, superplastic behavior and anomalous yield strength peak are reviewed. Several Ti-Al and Ni-Al based alloys have been manufactured, and show good mechanical properties. Diverse components have been fabricated successfully. (C) 2000 Elsevier Science Ltd. All rights reserved.

关键词: aluminides, miscellaneous;hydrogen embrittlement;mechanical properties;at high temperatures;superplastic behavior;phase interfaces;grain-boundary fracture;in-situ composites;environmental;embrittlement;hydrogen embrittlement;ni3al;compression;alloys;co3ti;boron;feal

微孔HA的制备及PLA/HA复合材料的性能研究

李海东 , 程凤梅 , 柳翱

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2007.01.026

采用模板聚合法合成了具有微孔结构的羟基磷灰石(HA),并用XRD和SEM对HA进行了结构和形貌分析,表明所合成的HA具有微孔结构;用熔融共混法制备了PLA/HA复合材料,测试了材料的弯曲强度并做了体外降解实验.HA含量为5%的样品弯曲强度最大,韧性最好,HA具有减缓PLA降解的作用,HA含量为15%的复合材料的分子量下降速度最慢.

关键词: 羟基磷灰石 , 聚乳酸 , 弯曲强度 , 降解 , 复合材料