材料期刊网

Physical Simulation of Thermally Induced Martensite Formation from Retained Austenite in TRIP Steels

Lie ZHAO , Fred J. VERMOLEN , Jilt SIETSMA , Sybr , van der ZWAAG

材料科学技术（英文）

The present work analyses the total free energy of the material during the martensitic transformation. A general expression for the martensite fraction as a function of temperature is derived, assuming that the nonchemical free energy is proportional to the volume of martensite. This expression indicates that the temperature-dependent martensite fraction can be predicted once the characteristic transformation temperatures and the relation between the chemical free energy and temperature of the martensite and austenite are known. An advantage of this development is that the proposed equation is valid for all types of relations between the chemical free energy and temperature. This simulation is successfully applied to the martensitic transformation upon further cooling of retained austenite in a low-alloyed TRIP steel, in which the relation between chemical free energy and temperature is quadratic and the fraction is determined from a thermo-magnetic measurement.

关键词: Thermodynamics , null , null , null

非线型三原子分子势能面的Lie代数方法

丁世良 , 冯东太 , 郑雨军

原子核物理评论 doi:10.3969/j.issn.1007-4627.2002.02.006

利用Lie代数方法得到三原子分子的代数Hamiltonian, 通过对光谱数据的拟合确定其展开系数, 再用相干态得到代数Hamiltonian的经典极限, 从而得到三原子分子的势能面. 以H2O分子为例进行了计算, 其理论值与实验结果一致.

关键词: 三原子分子 , 势能面(PES) , 高激发振动态 , Lie代数

Lie algebraic analysis for the nonlinear transport of intense bunched beam in electrostatic quadrupoles

中国物理C

关键词:

Comparison of the PIC model and the Lie algebraic metnod in the simulation of intense continuous beam transport

中国物理C

关键词:

SCANNING TUNNELING MICROSCOPY OF (CrFe)_7C_3

WANG Jia jun , YANG Zhigang , LI Chunming , FANG Hongsheng (Tsinghua University , Beijing , China Manuscript received 1 December , 1994)

金属学报(英文版)

The microstructure of(CrFe)_7C_3 has been studied with scanning tunneling microscopy.It shows that a carbide consists of colonies which are full of stacking faults. The stacking faults in one colony are parallel while those in different colonies lie at angle with each other.

关键词: : scanning tunneling microscopy , null , null

1998 COMPREHENSIVE TABLE OF CONTENTS

中国腐蚀与防护学报

N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....

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Noncollinear magnetic ground state of PrFeAsO

Europhysics Letters

Noncollinear magnetic investigations of the ground state in PrFeAsO have been performed by the density-functional theory. We calculated the total energy and made structure optimization, and the electronic density of states of PrFeAsO was analyzed. There are three different magnetic structures in PrFeAsO defined by experiments. Based on these magnetic structures, we studied four collinear and four noncollinear cases. The ground state is found to take the ordering proposed by Zhao, in which the FeAs plane is of stripe antiferromagnetism and Pr spins are perpendicular to Fe spins. The electronic density of states indicates that for PrFeAsO the increase of the electron Coulomb interaction leads to a decrease in conductivity. Copyright (C) EPLA, 2011

关键词: high-temperature superconductivity;phase-diagram;oxypnictides;instability

Comparison of the Molecular Interaction Volume Model with the Wagner Formulae in the Zn-Pb-In and Zn-Sn-Cd-Pb Dilute Solutions

Dongping TAO , Zhuo CHEN , Dunfang LI , Yifeng GAO , Qianghua SHEN

材料科学技术（英文）

The coordination numbers in the molecular interaction volume model (MIVM) can be calculated from the common physical quantities of pure liquid metals. A notable feature of the model lie in its capability to predict the thermodynamic properties of solutes in the Zn-Pb-In and Zn-Sn-Cd-Pb dilute solutions using only the binary infinite dilute activity coefficients, and the predicted values are in good agreement with the experimental data of the dilute solutions.

关键词: Activity , null , null , null

两个非线性方程的势对称及其不变解

王晓民 , 苏道毕力格

连铸 doi:10.3969/j.issn.1007-5461.2016.05.004

通过计算非线性电报方程(NTT)和Burgers方程的势对称扩大了其古典对称,并获得了Burgers方程一系列新的精确解.基于微分特征列集算法确定了NTT方程和Burgers方程的古典对称和势对称,并计算了Burgers方程的2个势对称对应的单参数Lie变换群;利用推广的简单方程方法构造了Burgers方程的不变解,这些解分别以含任意2个参数的双曲函数、三角函数和有理函数表示;将势对称对应的Lie变换群(14)作用于Burgers方程的不变解获得了新的精确解,这些解都不能由方程的古典对称得到.

关键词: 非线性方程 , 势对称 , 微分特征列集算法 , 非线性电报方程 , Burgers方程 , 不变解

DIRECT OBSERVATION OF DOMAIN-STRUCTURES AND INTERFACE DISLOCATIONS IN M7C3 BY HIGH-RESOLUTION ELECTRON-MICROSCOPY

Philosophical Magazine a-Physics of Condensed Matter Structure Defects and Mechanical Properties

The domain and defect structures of M7C3 with a lattice parameter ratio b/a not-equal square-root 3 in a cast-iron based superalloy have been studied by transmission electron microscopy. High-resolution (HR) images viewed along the exact [001] beam direction have displayed domains with threefold rotational symmetry and interface dislocations which lie on the prismatic plane of the hexagonal sublattice. The antiphase boundaries on (110) planes have also been detected in the [111] HR images.

关键词: periodic defect structures;carbides