材料期刊网

EFFECT OF MAGNETIC FIELD ON MARTENSITIC TRANSFORMATION IN Fe-21Ni-4Mn ALLOY

SUN Enxi Dalian Railway College , Dalian , ChinaYANG Dazhi Dalian University of Technology , Dalian , ChinaXU Zuyao (T.Y.Hsu) Shanghai Jiaotong University , Shanghai , ChinaYANG Fuming ZHAO Ruwen Institute of Physics , Academia Sinica , Beijing , China YANG Dazhi , Professor , Dalian University of Technology , Dalian 116024 , China

金属学报(英文版)

The pulsed magnetic field induced martensitic transformation with isothermal and athermal kinetics in Fe-2Ni-4Mn(wt-%)alloy has been studied by means of magnetization measurements,optical microscopy and thermodymical analyses.It is shown that there exits a critical magnetic intensity for induing martensitic transformation at a given temperature above Ms.The critical magnetic field increases linearly with increasing ΔT= T-M_S.The magnetic field strongly promotes the athermal martensitic transforamtion and restrains the isothermal one.The entropy change ΔS for athermal transformation at Ms is 4.13 J/mol· K.The effect of magnetic field on martensitic transformation in Fe-21Ni-4Mn alloy is main- ly due to Zeeman effect.Lath,plate and butterfly martensities were observed under magnetic field.

关键词: magnetic field-induced martensitic transformation , null , null

EFFECT OF NITROGEN ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ALLOY HK50

YU Yongsi CAO Zhiben WANG Fugang , Dalian University of Technology , Dalian , ChinaGUO Xiaobing Jinzhou Institute of Technology , Jinzhou , China Associate Professor , Dept.of Materials Science , Dalian University of Technology , Dalian 116024 , China

金属学报(英文版)

The volume fraction of the lamellar carbide cell in HK50 alloy may be increased with the in- crease of nitrogen content over 0.065%.The habit plane of l(?)mellar carbide is {111}_γ.The distribution of nitrogen changes no more before or after the precipitation of lamellar structure. The diffusion activation energy of carbon reduces remarkably with the increase of nitrogen content.It is believed that the lamellar carbide cell is harmful to the high temperature creep and impact properties of the alloy.

关键词: alloy HK50 , null , null , null

FINE STRUCTURE VARIATION OF 18R MARTENSITE UNDER DEFORMATION IN POLYCRYSTALLINE CuZnAl AI JOY

ZHU Min LI Guobin YANG Dazhi Dilian University of Technology , Dalian , China Dept.of Materials Engineering , Dalian University of Technology , Dalian 116024 , China

金属学报(英文版)

The transmission electron microscopy has been used to investigate the fine structure variation of 18R martensite under deformation in a polycrvstalline CuZnAl shape memory alloys.It has been found that the strain is gabined by the reorientation of martensite variants in the ini- tial deformation stage.In addition to the result of optical microscopy studies,however,the reorientation is often incomplete and the interfaces among the prior variants still remain.A lot of twins will appear in martensite under enormous deformation,and the twin plane is(001) phane of martensite lattice.The dislocations has also been observed in some regions.In this case,the martensite will lose its thermoelasticitv and the shape memory effect will be damaged.

关键词: fine structure , null , null , null

Catalysis on nano-carbon materials: Going where to? Preface

Catalysis Today

This contribution to the special issue of Catalysis Today is dedicated to selected contributions presented at the Carbocat-IV (Carbon for Catalysis) Symposium held in Dalian (China) on November 7-10 (2010). The introduction first shortly overviews the main reasons for the interest on carbon materials for catalysis and the elements of novelty discussed on the contributions of this issue, and then provide a concise outline of the general trends and developments in this field to give a glimpse on the progresses in the field, and on the perspectives of this exciting area of catalysis. (C) 2012 Elsevier B. V. All rights reserved.

关键词: Nano-carbon;Catalysis on carbon;Nanostructured carbon-based materials;Carbon hierarchy;ordered mesoporous carbon;metal-free;nanostructured carbon;activated;carbon;oxidative dehydrogenation;heterogeneous catalysis;sustainable;energy;counter electrode;porous carbons;fuel-cells

等离子体改性1Cr18Ni9Ti不锈钢钝化膜的耐蚀性

雷明凯 , 袁力江 , 孔常静 , 张仲麟

中国腐蚀与防护学报

等离子体改性１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢钝化膜的耐蚀性雷明凯，袁力江，孔常静，张仲麟（大连理工大学大连１１６０２４）电子回族共振（ＥＣＲ）微波等离子体具有高电子密度和离化率，低放电粒子溅射率及无极放电设计等优点［１－２］，为金属钝化膜的改性提供了有效和便利的手段。本文报导利用ＥＣＲ微波氮等离子体轰击１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢钝化膜进行表面改性的技术和结果。其耐蚀性采用动电位阳极极化曲线评定；钝?...

关键词: null , Surface modification , Passive film