材料期刊网

EFFECT OF GRAIN BOUNDARY CARBIDE ON CREEP CRACK GROWTH IN Fe-Cr15-Ni25 ALLOY

WANG Fugang ZHU Suming ZHU Shijie REN Xiaomin TAN Yi ZHANG Junshan Dalian University of Technology , Dalian , China

金属学报(英文版)

Creep crack growth behavior of Fe-Cr15-Ni25 alloys with different grain boundary features has been studied.Cavities nucleate at triple junctions of grain boundaries for the single phase alloy and at grain boundary carbide for the alloy with grain boundary carbide.Grain bounda- ry carbide particles are obstacles to cavity growth and coalescence,and therefore increase the creep crack growth resistance greatly.

关键词: creep , null , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

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Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

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Huazhong University of Science and Technology(H.U.S.T)

材料科学技术（英文）

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立方 TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3724/SP.J.1077.2007.00400

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉．利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征．结果表明: 所制备的纳米粉为单一的立方相TaN, 纳米颗粒的平均粒度为5~10nm．实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用, 并讨论了立方相TaN的形成机理．

关键词: 立方相TaN , nanocrystallites , dc arc discharge method

立方TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3321/j.issn:1000-324X.2007.03.004

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉.利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征.结果表明:所制备的纳米粉为单一的立方相TaN,纳米颗粒的平均粒度为5～10nm.实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用,并讨论了立方相TaN的形成机理.

关键词: 立方相TaN , 纳米粉 , 直流电弧法

两种组织的Ren80高温合金的蠕变裂纹扩展行为

孙坚 , 张源虎 , 胡赓祥

金属学报

研究了定向凝固和普通铸造的Ren80合金在1123K静载荷下的蠕变裂纹扩展行为结果表明,Ren80合金蠕变裂纹扩展速率,可用应力强度因子较好地关联定向凝固合金蠕变裂纹与扩展速率较低,其应力强度因子指数约为普通铸造合金的1/2

关键词: 高温合金 , directional solidification , stress intensity factor , creep crack propagation , null

0℃时YI3-C6H12N4·HI-H2O的相图及YI3·C6H12N4·HI·14H2O的合成与表征

王丽 , 吴希文 , 张晨鼎 , 张通 , 简丽 , 武朝军 , 周涛

稀土 doi:10.3969/j.issn.1004-0277.1999.02.003

采用湿渣法研究了0℃时碘化钇(YI3)-乌洛托品氢碘酸盐(C6H12N4.HI)-水(H2O)的三元体系相平衡,绘制了该体系的等温溶解度相图,相图分析结果表明,该体系中有组成为YI3.C6H12N4.HI.14H2O的配合物生成,对所得配合物进行了化学分析、X-射线粉末衍射、红外光谱、差热-热重分析,测定了其密度、晶体轴性,确定了配合物结构中的配位关系.

关键词: 相平衡 , 碘化钇 , 乌洛托品氢碘酸盐 , 配合物

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

Microstructural study on multilayer FeTaN/TaN (5) films

Materials Letters

The microstructure of [FeTaN/TaN](5) multilayer films has been investigated by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) in cross section and plan view. Each layer shows a small surface roughening less than 1 nm. The FeTaN layers are composed of b.c.c. Fe with Ta incorporated substitutionally and N interstitially, denoted as Fe(Ta,N); while the TaN layers mainly consist of f.c.c. TaN phase. A [110] texture of Fe(Ta,N) has been formed in the FeTaN layers. The columnar grain structure is a typical feature in FeTaN layers. (C) 2003 Elsevier Science B.V. All rights reserved.

关键词: microstructure;thin films;magnetic materials;transmission electron;microscopy (TEM);sputtering;fetan thin-films;magnetic-properties;recording-heads;tantalum;nitride;temperature