材料期刊网

A STUDY OF CARBIDE GROWTH IN MAR-M247 LC ALLOY BY DIRECTIONAL SOLIDIFICATION METHOD

J.H Lee , J. Chen , S.J. Choe , Y.T. Lee and H.M. Kim(High Temperature Materials Laboratory , Korea Institute of Machinery & Materials , 66 Sangnam Dong , Changwon , Kyungnam , 641010 , Korea Manuscript received 26 August 1996)

金属学报(英文版)

The carbide growth behavior of MAR-M247 LC alloy was investigated by directional solidification and quench method. The carbide volume fraction, trapping and growth behavior were correlated with the growth rate.It was found that the carbide volume fraction decreased at slower growth rate.This decreasing was caused by lower solidliquid interface trapping ability at slower growth rate.

关键词: :carbide , null , null , null

DEPOSITION OF c-BN FILMS AND ADHESION IMPROVEMENT

S.R. Lee , E.S.Byon and Y.-W. Seo 1)Korea Institnte of Machinery and Materials , Changwon 641-010 , Korea 2)V & P International Co. , Ltd , 705-9 , Gozandong , Inchon 405-310 , Korea Manuscript received 26 August 1996)

金属学报(英文版)

Cubic boron nitride (c-BN) films were successfully grown on Si(100)substrates by a helicon wave plasma-assisted chemical vapor deposition technique.The lower limits of rf substrated bias voltage and plasma density for formation of a single phase c-BN film were 350V and 4.5×10~(10) cm~(3),respectively. The grown c-BN films demonstrated a poor adhesion to the substrates. A postannealing treatment at 800℃ C in N_2 atmosphere was found very effective in relieving the compressive stress in the films which were thereby stabilized to improve the adhesion.

关键词: :cubic boron nitride , null , null , null

DEVELOPMENT OF BRAIDED-PULTRUSION PROCESS AND STRUCTURE-PROPERTY RELATIONSHIPS FOR TUBULAR COMPOSITES

J.H. Byun , S.-K.Lee and B.S. Kim (Korea Institute of Machinery and Materials , P.O. Box 41 , Changwon , Korea Manuscript received 26 August 1996)

金属学报(英文版)

In order to realize the potential of composite materials, it is imperative to develop a manufacturing process, to understand the microstructures, and to assess the structural performance of the composite. The braided-pultrusion process, which combines the pultrusion process with the braiding technology, has been developed by utilizing a novel resin impregnation device. The goal of the development is to achieve both costeffectiveness and performance of the composite. The tubular composites of diameter 5.3 mm have been produced using Kevlar 49 fiber and polyester resin. In order to assess the mechanical performance of the composites, an analytical method for predicting the elastic constants has been developed. The analysis includes the geometric model of a unit cell, coordinate transformation, and averaging of stiffness and compliance constants of the constituent materials. The analytic predictions compared favorably with experimental results.

关键词: : braided pultrusion , null , null

R & D ACTIVITIES ON AEROSPACE MATERIALS IN KOREA

H.M. Kim(Korea Institute of Machinery and Materials , Korea Manuscript received 26 August 1996)

金属学报(英文版)

This paper briefly reviews research and development programs in Korean aerospace industry,with an emphasis on aircraft materials technology. International collaborations in these areas are outlined and the R & D activities are highlighted against the　background of the national economy.It is shown that the investment from government agencies and large enterprises has led to healthy development of aerospace materials industries in Korea.

关键词: :R & D , null , null , null

Manuscript Requirements

新型炭材料

关键词:

《中国腐蚀与防护学报》1996-2000年引文统计分析

张冬梅 , 赵美娣

中国腐蚀与防护学报

对《中国腐蚀与防护学报》在1996～2000年5年间出版的所 有论文的参考文献进行了统计，分析了引文量、引文类型、引文语种、高频被引的中外文期 刊、刊自引率、基金论文比、引文文献的半衰期、普赖斯指数等各个指标及从中所反映的论 文情况和刊物情况，并对刊物的今后发展提出了建议.

关键词: 中国腐蚀与防护学报 , citation statistics , citation analysis

含金三元合金系的研究进展(1996～2007年)

张康侯

贵金属 doi:10.3969/j.issn.1004-0676.2008.02.011

评述了1996～2007年国际上对含金三元合金系相图、相变的研究进展.1996年以来,在主要国际专业刊物上发表了30多个三元金合金系相图的部分等温截面或纵截面,采用实验方法研究相图的工作占了绝大部分.在所研究的上述三元金合金系中,Au-Sn基合金系有11个,Au-Ag基合金系有6个,Au-Cu和Au-Sb基合金系各有4个,Au-Mn和Au-Si基合金系各有2个.这些合金系目前涉及到的主要应用领域为:钎焊材料、电触头材料、电子材料、磁性材料、形状记忆合金材料、金属离子源材料和喷丝头材料等.含金三元合金系的研究反映了当前对新型金合金功能材料的需求动向, 对指导促进相关新合金材料的开发有重要意义.

关键词: 金属材料 , 金合金 , 三元合金系 , 相图 , 进展

Research on superplasticity and superplastic extrusion of MB26 magnesium alloy

Fuxiao CHEN , Juanhua SU , Yunlin YANG , Hongtao MA

材料科学技术（英）

The superplastic flow characteristics of hot extruded MB26 Mg alloy under the conditions of tension are studied. The effects of deformation temperature and strain rate on superplasticity are analyzed. On the other hand, the superplastic extrusion of MB26 Mg alloy is also studied.

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星际26Al核合成的研究进展

刘宏林 , 罗志全

原子核物理评论

介绍了星际 26Al衰变所发射1 809 keV γ射线的最新空间探测结果,综述了目前关于星际26Al起源的各种天体模型的研究进展.最后,简要阐述了14N(p,γ)15O反应截面的最新测量结果及其对26Al起源研究的影响,探讨了一种星际 26Al合成的可能新途径.

关键词: 星际介质 , 大质量主序星 , 新星 , 超新星 , WR星 , AGB星

淬火对V40Ti26Cr26Fe8贮氢合金的影响

郑欣 , 陈云贵 , 吴朝玲 , 童桂蓉 , 周晶晶

功能材料

淬火工艺被广泛应用于钒基固溶体贮氢合金的热处理过程中,并被认为能够有效改善合金成份均匀性,提高合金的有效放氢量.考察了淬火对V40Ti26Cr26Fe8贮氢合金放氢PCT性能的影响.合金微观结构变化的分析表明,合金在退火态时存在C14 Laves相,淬火后Laves相固溶于BCC主相中,含量下降.成分分析表明,合金BCC主相淬火后Ti含量上升.与退火处理相比,合金放氢量和平台压在淬火后均出现下降.而合金在淬火过程中产生的缺陷及应力,导致了放氢平台倾斜,滞后增大且放氢量下降.

关键词: 贮氢材料 , 淬火 , 微观结构