材料期刊网

可控热氛围下丙烷柴油混合燃料喷雾特性试验研究

张青 , 吴志军 , 赵文伯 , 包堂堂 , 邓俊 , R W Dibble

工程热物理学报

利用可控热氛围燃烧系统提供的稳定均匀温度场,使用高速摄像机研究丙烷/柴油混合燃料的稳态喷雾特性.研究了不同混合比例、背景温度和喷射压力下混合燃料的喷雾发展过程和相关喷雾特性参数的变化规律.结果表明,相对于纯柴油燃料,丙烷/柴油混合燃料喷雾在形态上有明显差别,丙烷含量增加,喷雾的最大贯穿距离减小,喷雾锥角变大,少量的丙烷添加,变化就极为明显.背景温度对纯柴油和混合燃料的喷雾参数的影响趋势相同,最大贯穿距离和喷雾锥角随背景温度的升高而减小,其中丙烷/柴油混合燃料对背景温度的变化更为敏感.

关键词: 丙烷 , 柴油 , 混合燃料 , 喷雾

METASTABLE R-PHASE IN Fe-Cr-Mo AND Fe-Cr-W ALLOYS

LIU Shicheng Dalian Railway Institute , Dalian , ChinaHAMAGOCHI Yoshikazu KUWANO Hisashi Muroran Institute of Technology , Muroran , Japan

金属学报(英文版)

The precipitation behaviour of Fe-Cr-Mo and Fe-Cr-W alloys during aging has been ex- perimentally studied.It was found that in the early stage of aging,a metastable R phase pre- cipitated in both alloys,it was transformed into stable μ-phase,Laves-phase,X-phase or σ-phase in the later stages.The crystallographic structure of metastable R-phase is rhombohedral with lattice parameters of a=0.9075 nm and α=74.45°.The chemical compo- sition of R-phase is Fe-(27.5—34.9)Mo-(0—25.5)Cr and Fe-(28.9—33.0)W-(9.36— 21.0)Cr in at.-% in Fe-Cr-Mo and Fe-Cr-W system,respectively.

关键词: Fe-Cr-Mo alloy , null , null , null

Fe-Cr-Mo,Fe-Cr-W合金中的过渡R相

刘世程 , 浜口由和 , 桑野寿

金属学报

研究了Fe-Cr-Mo、Fe-Cr-W合金的时效析出过程,发现在时效初期、两合金系中均有过渡R相析出,过渡R相为菱形点阵,α=0.9075nm,α=74.45°,其成分在Fe-Cr-Mo合金中为Pe-(27.5—34.9)Mo-(0—25.5)Cr,在Fe-Cr-W合金中为Fe-(28.9—33.0)W-(9.36—21.0)Cr(at.-％),时效后期,过渡R相分别向平衡相μ相、Laves相、χ相及σ相转变。

关键词: Fe-Cr-Mo合金 , Fe-Cr-W alloy , precipitation

新型氧离子导体La1.84R0.16Mo1.7W0.3O8.92(R=Ca2+、Sr2+、Ba2+)的制备及其电性能

周德凤 , 叶俊峰 , 朱建新 , 孟健

功能材料

以La2Mo1.7W0.3O9为本体,在La位进行碱土金属掺杂,采用溶胶-凝胶方法合成新型氧离子导体La1.84R0.16Mo1.7 W0.3O8.92(R=Ca2+、Sr2+、Ba2+).应用示差热分析(DTA)、X射线衍射(XRD)、拉曼光谱(Raman)等手段对氧化物进行结构表征,交流阻抗谱测试电性能.结果表明:掺杂改善了本体导电性能的同时,保持了La2Mo1.7W0.3O9抑制La2Mo2O9相变的功能;碱土离子的掺杂,在体系中引入了氧空位,有利于氧离子扩散,提高氧离子导电性,773K时Ba2+掺杂体系的电导率为1.0×10-4S/cm,高于本体的电导率(5.0×10-5/cm).

关键词: 固体电解质 , 氧离子导体 , 掺杂 , La2Mo2O9

R-line thermal shift and thermal broadenings of R, R' and B lines for ruby

Communications in Theoretical Physics

The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.

关键词: diamond anvil cell;pressure measurement;spectroscopy;temperatures

METASTABLE CHARACTERISTICS OF β-W

HUANG Huimin CHEN Xinmin Central South University of Technology , Changsha , China HUANG Huimin Associate Professor , Department of Chemistry , Central South University of Technology , Changsha , China

金属学报(英文版)

The nature of the oxygen contained in β-W was investigated with DSC,X-ray analysis on quenched samples and Auger spectroscope.It was shown that the oxygen contained in nonpyrophoric β-W consists of the reversibly chemisorbed oxygen and the interstitial oxygen which could form an interstitial solid solution with β-W.It seems better to consider β-W to be a metastable phase of tungsten with the interstitial oxygen as stabilizer.

关键词: tungsten , null , null , null

含磷深冲钢板的△r值与织构的关系

黄丽明 , 张魁 , 赵骧 , 梁志德

材料研究学报

本文介绍了含磷深冲钢板的△r 值与织构的关系,指出△r 值主要由平行于轧向的晶向{111}决定。分别由体积百分含量的差值(△V/V_({111}<112>)-△V/V_({111}<110>)和W_(lmn)对△r 值进行回归,得出了△r 值与织构之间的定量关系。

关键词: △r 值 , texture , ODF , volume percent fraction , Wlmn

EFFECT OF W ON MECHANICAL PROPERTIES OF 12%Cr HEAT-RESISTANT STEEL

LIU Xingyang Northeast University of Technology , Shenyang , China FUJITA Toshio The University of Tokyo , Tokyo , Japan

金属学报(英文版)

The effect of W on mechanical properties of 12% Cr-W-V-Nb heat resistant steel at high temperatures and room temperature is reported.The experimental results indicated that if the W content was about 2.2—3.0 wt-%,there was no obviously change of R.T.tensile strength, but impact toughness decreased with the rise of W content.On the other hand,the increase of W content enhanced the short time stress rupture strength,but did not for the long time one. The increase of W have two effects on the precipitation behavior,promoting Laves formation of type Fe_2W,increasing the precipitated phase amount and speeding up the coarsening pro- cess of precipitated phase at high temperatures.The effect of W on the mechanical properties is closely associated with precipitation behaviors.When the rupture life is short,there has no enough time to coarsen the precipitated phases,so the increase of precipitated phases results in strengthening effect,i.e.the W increases the high temperature strength.After prolonged expo- sure,the evident coarsening took plaee,that decreased the effect of precipitation.

关键词: 12%Cr-W-V-Nb steel , null , null , null

Theoretical calculations of thermal broadenings and transition probabilities of R, R ' and B line-groups for ruby

Communications in Theoretical Physics

On the basis of the unified calculation of the thermal shifts of R-1 line, R-2 line and ground-state-splitting as well as the thermal broadenings of R, R' and B line-groups for ruby, by taking into account all the levels and admixtures of wavefunctions within d(3) electronic configuration and all the GammaM in electron-phonon interaction, the transition probabilities of direct and Raman processes have theoretically been calculated. The thermal broadenings, of R, R' and B line-groups have successfully been interpreted in terms of the direct and Raman processes of acoustic phonons. The theoretically predicted transition probabilities are in good agreement with the experimental ones.

关键词: crystal fields;electron-phonon interaction;thermal broadening;transition probability;direct and Raman processes;shifts

Phase diagram of R-Fe-Co pseudoternary system with R <= 33.3% (mole fraction, R = Sm0.5Dy0.5)

Transactions of Nonferrous Metals Society of China

Phase equilibria of the R-Fe-Co pseudoternary system with R less than or equal to 33.3% ( mole fraction, R = Sm0.5Dy0.5) were determined in an isothermal section at 1073 K and a vertical section of RFe2-RCo2 by using OM, X-ray diffractometer, EP-MA DTA techniques. There are seven intermetallic phases: (Sm, Dy) (Fe, Co)(2), (Sm, Dy) (Fe, Co)(3), (Sm, Dy)(6) (Fe, Co)(23), (Sm, Dy)(2) (Fe, Co)(7), (Sm, Dy) (Fe, Co)(5), Th2Ni17-type and Th2Zn17-type (Sm, Dy)(2)(Fe, Co)(17). The (Sm, Dy)(6)(Fe, Co)(23) phase dissolves 36% Co(mole fraction) at 1073 K. However, the (Sm, Dy)(2)(Fe, Co)(7) phase in R-2(Fe1-xCox)(7) alloys dissolves about 19% Fe(mole fraction) at 1073 K.

关键词: rare earth-iron-cobalt;phase diagram;structure;compounds;sm-co;magnetic-properties;binary-system;magnetostriction