材料期刊网

STUDY ON THE VARIATION MECHANISM OF CARBON CONTENT OF LIQUID IRON IN MELTING GASIFIER

Q.Lu , L.Y.Sun , Y.Xu , Q.F.Chai

金属学报(英文版)

This paper studied the changing principles of carbon content in direct reduction iron (DIR) and liquid iron in the COREX melting gasifier.Under the normal working conditions of experimental equipment,liquid nitrogen was poured into the meling gasifier from its tuyere to cool down quickly.And then seven cross sections were made to study the carburization reaction and its characteristics of the solid iron and the liquid iron,and also the reaction of carbon between the slag and the metal.According to the results,the influences of the thickness of the semi-coke layer and the temperuture on the carbon content of liquid iron in the COREX meltion gasifier were confirmed.

关键词: melting gasifier , null , null

Improving glass-forming ability of Mg-Cu-Y via substitutional alloying: Effects of Ag versus Ni

Journal of Materials Research

Based on the best bulk metallic glass (BMG) forming alloy in the Mg-Cu-Y ternary system, we introduced Ag (or Ni) to partially substitute for Cu to improve the glass-forming ability (GFA). The objective of this paper is twofold. First, we illustrate in detail a recently developed search strategy, which was proposed but only briefly outlined in our previous publication [H. Ma, L.L. Shi, J. Xu, Y. Li, and E. Ma: Discovering inch-diameter metallic glasses in three-dimensional composition space. Appl. Phys. Lett. 87, 181915 (2005)]. The protocol to navigate in three-dimensional composition space to land large BMGs is spelled out step-by-step using the pseudo-ternary Mg-(Cu,Ag)-Y as the model system. Second, our ability to locate the best BMG former in the composition tetrahedron allows us to systematically examine, and conclude on, the effects of a given alloying element. The large improvement in glass-forming ability in the Mg-(Cu,Ag)-Y system relative to the based ternary will be contrasted with the reduced glass-forming ability in the Mg-(Cu,Ni)-Y pseudo ternary system. It is demonstrated that the improvement of glass-forming ability requires judicious choice of substitutional alloying elements and concentrations, rather than simple additions of multiple elements assuming the "confusion principle."

关键词: bulk metallic-glass;shaped copper mold;amorphous-alloys;thermal-stability;ternary-system;casting method;p system;diameter;zr;mm

Professor XU Zhong-yu and his research activities

新型炭材料

关键词:

ELECTRONIC STRUCTURE OF Pd-Y-Si GLASSES

LUO Meiqing CHEN Nianyi Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , ChinaYU Zhizhong Shanghai Institute of Testing Technics , Shanghai , ChianNING Yuantao ZHOU Xinming Kunming Institute of Precious Metals , Kunming , China CHEN Nianyi , Professor , Shanghai Institute of Metallurgy , Academia Sinica , Shanghai 200050 , China

金属学报(英文版)

The electronic structure of Pd-Y-Si glass has been investigated by ESCA and quantum chem- ical calculation.It was found that the valence electrons of Y transferred to Si atoms in this metallic glass,forming polar covalent bonds.Perhaps these strong covalent bonds link Si and Y atoms to form clusters that hinder the process of crystallization.

关键词: Pd-Y-Si glass , null , null , null

SOLUBILITIES OF Ce,Nd AND Y IN α-Fe

LI Laifeng XING Zhongshu Institute of Metal Research , Academia Sinica , Shenyang , China XING Zhongshu , professor , Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The solubilities of Ce,Nd and Y in α-Fe at 873 to 1153 K have been deter mined by means of electron microprobe quantitative analyses.The temperature dependences of the solubilities were obtained from the experimental data.The results have been compared with those deter- mined by three other technigues,very good agreement was obtained between the results of all these techniques.

关键词: α-Fe , null , null , null , null

沸石Y用于组装纳米CdS

翟庆洲 , 蔡建岩 , 于淼

稀有金属材料与工程

以沸石Y及以甲基三甲氧基硅烷对沸石Y进行表面改性后的Y(m)沸石作主体,用离子交换法制备Cd-Y及Cd-Y(m)样品,然后以硫代乙酰胺取代有毒的硫化氢作硫源,水热法制备Y-CdS及Y(m)-CdS主-客体纳米复合材料.利用粉末XRD、化学分析、红外光谱、固体扩散漫反射吸收光谱、发光研究对制备的样品进行了表征.化学分析表明,CdS已进入沸石Y(Ym)主体中;XRD结果表明,CdS进入沸石Y(Ym)后,制得的复合材料沸石骨架仍然存在,且保持高度有序性,不改变骨架的长程有序性;红外光谱结果表明,在所制备的Y-CdS及Y(m)-CdS样品中,有Si-O-Cd新键生成;固体扩散漫反射吸收光谱结果表明,沸石Y和Y(m)对可见光基本无吸收,Y-CdS和Y(m)-CdS吸收无明显差别;组装CdS后,Y-CdS及Y(m)-CdS产生发光现象.所制得的Y-CdS及Y(m)-CdS主-客体纳米复合材料具有作为发光材料的潜在性.

关键词: Y沸石 , Y改性沸石 , 甲基三甲氧基硅烷 , 纳米CdS , 主-客体纳米复合材料 , 表征

Microstructure Formation and Mechanical Property Involving Icosahedral Quasicrystal Phase of Y Rich Mg-Zn-Y Quasicrystal Alloy

D.Q. Wan , G.C. Yang

金属学报(英文版)

The microstructure formation and mechanical property involving icosahedral quasicrystal (I-phase) in the Y-rich Mg-Zn-Y alloy have been studied. The equilibrium formation of I-phase from the Y-rich Mg-Zn-Y melt is through a peritectic reaction between the Y-rich melt and the primary W-phase, which is discussed in detail. The independent nucleation and coupling growth mechanism between the W-phase and the I-phase, from the melt, are revealed, which is significant for understanding the peritectic reaction process involving icosahedral quasicrystal in the Mg-Zn-Y alloy. The mechanism of the quasicrystal phase strengthened magnesium alloys is also discussed here.

关键词: Mg-Zn-Y , null , null

EFFECT OF Y ON MECHANICAL PROPERTIES OF Fe-20Cr-4Al-Y ALLOY

LI Bei WU Shuangxia MENG Guang'en JIANG Liping PANG Wenjie Baotou Research Institute of Rare Earth , Baotou , China Baotou Research Institute of Rare Earth , P.O.Box 131 , Baotou 014010 , China

金属学报(英文版)

With the increase of Y content in the Fe-20Cr-4AI-Y alloy,the uniform deformability of tensile specimens was found to be slightly decreased,as well as,the fracture strength and re- duction after necking remarkably dropped.This seems to be dependent upon the brittle phase containing Y.The behaviour of Y-containing phase may be improved by adjusting the metallurgical technological process.

关键词: Fe-Cr-A1 alloy , null , null

THE　EFFECTS　OF　Y,Zr　AND　Si　ADDITIONS　ONCYCLICOXIDATIONBEHAVIOUROFFeAlINTERMETALLICS

腐蚀学报（英文）

研究了Y、Zr、Si对FeAl金属间化合物在1000～1200℃下循环氧化性能的影响,并用X射线衍射、扫描电镜及能谱分析等手段分析了氧化产物。结果表明,Y、Zr、Si的加入大大提高了FeAl金属间化合物表面氧化膜的抗剥落能力。从氧化动力学上看,Y和Zr或Y和Si的同时加入比单独加Zr效果好。

关键词: FeAl金属间化合物 , null , null

Au-Ag-Y三元系富Au-Ag区域(Y≤34at%)的700℃等温截面

张康侯 , 陈亮维 , 尹俊美 , 陈藜莉 , 谢明 , 符世继

贵金属 doi:10.3969/j.issn.1004-0676.2008.04.001

在Au-Ag、Au-Y和Ag-Y二元合金相图的基础上,采用X-射线衍射分析、电子探针等手段研究了Au-Ag-Y三元系中富金-银区域(Y≤34at%)的700℃等温截面.发现:在该截面的富金银侧沿着Au-Ag二元匀晶系存在一个单相区Au(Ag)或Ag(Au);在二元金属间化合物Au2Y和Ag2Y之间存在一个无限固溶体区域(Au2Y)或(Ag2Y).在该部分700℃等温截面上一共有6个单相区:Au(Ag) 或 Ag(Au)、Au6Y、Au51Y14、α(Au2Y) 或 (Ag2Y)、 Au3Y和 Ag51Y14;9个两相区:Au(Ag)+ Au6Y、 Au(Ag)+ Au51Y14、 Au(Ag)+ Au3Y、 Au(Ag)+ α(Au2Y)、 Au(Ag)+ Ag51Y14、Ag51Y14+α(Au2Y)、α(Au2Y)+ Au3Y、 Au3Y+ Au51Y14 和 Au51Y14+ Au6Y;4个三相区: Ag51Y14+α(Au2Y)+Au(Ag)、α(Au2Y)+ Au3Y+ Au(Ag)、 Au3Y+ Au51Y14+ Au(Ag) 和 Au51Y14+ Au6Y+ Au(Ag).在Au-Ag-Y三元系的该成分区域没有发现新的三元中间相.

关键词: 材料科学基础学科 , Au-Ag-Y三元系 , 合金 , 相图 , 等温截面