STATISTICAL THEORY OF MOLTEN SALT SOLUTIONS Ⅳ. PHASE EQUILIBRIUM OF A_2B-AC-AD-AE SYSTEMS

根据我们以前提出的熔盐溶液的统计模型和零级近似规则溶液理论,导出了A_2B-AC-AD-AE型四元同离子系相图中A_2B初晶温度的计算方法.计算结果与若干实测数据符合较好。     

STATISTICAL THEORY OF MOLTEN SALT SOLUTIONS Ⅰ. ENERGY OF MIXING OF BINARY SYSTEMS

本文根据熔盐的径向分布函数理論,对于含一价离子的二元熔盐溶液,提出了三度空間的熔盐溶液統計模型。根据这一模型导出了計算二元熔盐系混合热、混合过剩自由能和某些二元相图液相线的公式,并利用这些公式对各种碱金属硝酸盐和卤化物的二元溶液作了計算,計算結果与实測值颇为符合。     

STATISTICAL THEORY OF MOLTEN SALT SOLUTIONS Ⅱ. ENERGETIC PARAMETER OF SOLUTION OF BINARY SYSTEMS

提出了熔盐溶液的溶解能参数的概念,熔盐系A_nB_m-A_(n′)C_(m′)(A离子之价数为Z)的溶解能参数为: f(r)=Z~2nn′/m(r_A+r_B)+Z~2n′~2/m′(r_A+r_C)-2Z~2nn′/(2r_A+r_B+r_C)(n′/nm′+1/m) 熔盐系A_nB_m-C_(n′)D_(m′)(C离子之价数为Z′)的溶解能参数为: f(r)=n′Z′Z(n+(nZ/n′Z′)m′/m′(r_A+r_D)+nZZ′(m+nZ/Z′)/m(r_B+r_C)-nZ~2(n+m)/m(r_A+r_B)-n′Z′Z(n′+m′)/m′(r_C+r_D)。 溶解能参数是熔盐静电混合能的近似函数,当f(r)为正值时,溶液呈现负偏差,当f(r)为负值时,溶液呈现正偏差,f(r)可作为估计熔盐溶液的热力学性质和二元熔盐相图的近似方法。     

FORMABILITY OF TERNARY INTERMEDIATE COMPOUNDS IN SOME MOLTEN SALT PHASE DIAGRAMS

ＦＯＲＭＡＢＩＬＩＴＹＯＦＴＥＲＮＡＲＹＩＮＴＥＲＭＥＤＩＡＴＥＣＯＭＰＯＵＮＤＳＩＮＳＯＭＥＭＯＬＴＥＮＳＡＬＴＰＨＡＳＥＤＩＡＧＲＡＭＳ￥Ｋａｎｇ，Ｄｅｓｈａｎ；Ｗａｎｇ，Ｘｕｅｙｅ；Ｙａｏ，Ｓｈｕｗｅｎ；Ｃｈｅｎ，Ｎｉａｎｙｉ（Ｓｈａｎｇｈａｉ...     

PHASE EQUILIBRIUM RELATIONSHIPS OF α_2(α)/γ IN THE Ti-Al-Cr TERNARY SYSTEM

采用扩散偶－电子探针法系统测定了Ｔｉ－Ａｌ－Ｃｒ三元系１０００－１３００℃的α２（α）／γ相平衡关系和相平衡成分,给给出Ｃｒ含量小于１０％（原子分数）范围的Ｔｉ－Ａｌ－Ｃｒ三元系局部等温截面和Ｔｉ－Ａｌ局部纵截面相图,明确了Ｃｒ在α２（α）和γ相中分配比的变化规律,研究结果支持Ｃｒ在γＴｉＡｌ相中取代Ａｌ的位置,降低γ－ＴｉＡｌ相中Ａｌ含量的观点。     

PREPARATION OF Pb-Ca-Na MASTER ALLOY USING MOLTEN CHLORIDE SALT ELECTROLYSIS

ＰＲＥＰＡＲＡＴＩＯＮＯＦＰｂ－Ｃａ－ＮａＭＡＳＴＥＲＡＬＬＯＹＵＳＩＮＧＭＯＬＴＥＮＣＨＬＯＲＩＤＥＳＡＬＴＥＬＥＣＴＲＯＬＹＳＩＳＳｏｎｇＲｅｎｙｉｎｇ；ＷａｎｇＸｉｎｇｊｉｅ；ＬｕｏＳｈｕｍｅｉ；ＪｉａｎｇＣｈａｎ；ＴａｎｇＤｉｎｇｘｉａｎｇ（...     

PHASE EQUILIBRIUM OF SBCL_3-HCL-H_2O SYSTEM

ＰＨＡＳＥＥＱＵＩＬＩＢＲＩＵＭＯＦＳｂＣｌ３－ＨＣｌ－Ｈ２ＯＳＹＳＴＥＭＤｕａｎ，Ｘｕｅｃｈｅｎ；Ｚｈａｎｇ，Ｄｕｏｍｏ；Ｚｈａｏ，Ｔｉａｎｃｈｏｎｇ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｃｈａｎｇｓｈａ４１００８...     

410℃ ISOTHERMAL SECTION OF Al-Cu-Sb TERNARY SYSTEM PHASE DIAGRAM

本文用X射线粉末衍射法和电子探针法测定了Al-Cu-Sb三元系相图的410℃等温截面。该截面由12个单相区、21个两相区和10个三相区构成。     

PHASE BOUNDARY OF α_2 PRECIPITATION IN Ti-Al-La TERNARY SYSTEM

用透射电镜相分析方法测定了Ti-Al-La三元系在600℃等温截面上α_2相析出相界.结果表明,相界曲线上存在一个Al含量的极大点.根据α_2相形成的电子浓度规律和La的内氧化反应过程,定性地解释了实测相界的走向和Al含量极大点的出现.     

PHASE BOUNDARY OF α_2 PRECIPITATION IN Ti-Al-La TERNARY SYSTEM

The phase boundary,of α_2 precipitation at 600℃ in Ti-AI-La ternary system has been de-termined by TEM examination,which shows three kinds of phase regions,namely thesingle α phase region,the transitional phase region where there is superlattice reflection butno α_2 precipitation,and the α+α_2 region.A point of maximum aluminium content was foundto exist on the α/(α+α_2)boundary and the track of the boundary was explained in terms ofthe internal oxidation of lanthanum and the electron concentration rule for α_2 formation.     

PHASE DIAGRAM OF Nd-Fe-B TERNARY SYSTEM——I.Isothermal Section at Room Temperature

The microstructures of both as-cast and homogenized Nd-Fe-B ternary alloys have beenstudied. The stable phase regions existing in Nd-Fe-B ternary system at room temperaturehave been established by the microzone composition analysis and the phase identification.Based on the obtained results, an isothermal section of Nd-Fe-B ternary system at roomtemperature was drawn.     

α(α2)/γ PHASE EQUILIBRIA IN Ti-Al-C AND Ti-Al-B TERNARY SYSTEMS

α（α２）／γＰＨＡＳＥＥＱＵＩＬＩＢＲＩＡＩＮＴｉＡｌＣＡＮＤＴｉＡｌＢＴＥＲＮＡＲＹＳＹＳＴＥＭＳ①ＬｉＪｕｎｔａｏ，ＨａｏＳｈｉｍｉｎｇＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒｉｎｇ，Ｎｏｒｔｈｅａｓ...     

ISOTHERMAL SECTION OF PHASE DIAGRAM IN Ti-Al-Cr TERNARY SYSTEM AT 1000℃

应用多元扩散偶－电子探针微区分析技术及Ｘ射线衍射分析方法,测定了Ｔｉ－Ａｌ－Ｃｒ三元系相图１０００℃等温截面的含Ａｌ量达７５ａｔ．－％,含Ｃｒ量达７０ａｔ．－％的大部分区域。确定了Ｌｌ２结构的三元化合物相及其成分范围,完整地测定了ＴｉＡｌ,Ｔｉ３Ａｌ,ＴｉＡｌ２及ＴｉＡｌ３的相区范围及相平衡关系,明确了β－Ｔｉ相与ＴｉＣｒ２相的平衡关系及ＴｉＣｒ２相的成分范围     

ROOM TEMPERATURE SECTION OF Cu-Dy(≤wt-%)-Ni TERNARY PHASE DIAGRAM

The room temperature section of Cu-Dy(≤35wt-%)-Ni phase diagram has been determinedby means of X-ray diffraction technique.The results are as follows.four single-phase regions(α,Dy_2Ni_(17),DyNi_5 and DyCu_5),five two-phase regions(α+Dy_2N_(17),Dy_2Ni_(17)+DyNi_5,DyCu_5+DyNi_5,α+DyNi_5 and DyCu_5+α)and two three-phase regions(α+Dy_2Ni_(17)+DyNi_5 and α+DyNi_5+DyCu_5)exist in the seetion.No any new phase was ob-servered.The solubility of Dy in α-phase is up to 2 wt-%.     

CALCULATION OF α/γ EQUILIBRIUM PHASE BOUNDARY IN LOW ALLOY STEELS

本文根据现有文献中的数据,将Sharma等的规则溶液模型推广到多元系,计算了含Cr,Mn,Si的20Cr,30Cr,40Cr,40Mn2,20CrMn,35CrMn2,38Crsi以及30CrMnSi等低碳低合金钢在其两相区各温度下α和γ两相的平衡浓度、两相的相对量及A_(e3)温度。计算得到的一系列合金的A_(e3)温度与实验值A_(c3)吻合较好。     

STUDY ON THE STABILITY OF T’PHASE IN THE Al-Zn-Cu TERNARY SYSTEM

The phase constitutes and phase compositions in the eight alloys designed with dif-ferent compositions of Al--Zn--Cu system have been determined after the homogenoustreatment and then equilibrium cooling to 20℃ by use of optical microscope, electronprobe microanalysis and X--ray diffraction. It has been found that there existed the T'phase in the seven alloys. Consequently, it was testified that the T' phase was stableat room temperature. At the same time, the phase relationship was not locally rightfor the isothermal section of 20℃ of Al--Zn--Cu system of the ASM published in 1997.     

A THERMODYNAMIC STUDY OF THE Fe-C SYSTEM Ⅲ.THE METASTABLE IRON-CEMENTITE EQUILIBRIUM

在本文中,作者首先计算了铁、碳化铁的共晶平衡,得出共晶温度为1148°;这在以前因为缺乏液态铁碳合金内的活度数据是不可能计算的。其次作者综合分析了前人数据,主要根据1148°的介稳共晶温度及723°的介稳共析温度,算出碳化铁的热力学函数。根据这样算出的碳化铁热力学函数及有关热力学数据,作者(i)复核了碳化铁的共析温度及共析点成分;(ii)计算了碳化铁在奥氏体内的溶解度;(iii)计算了碳化铁在铁液内的溶解度及碳化铁液相线与石墨液相线的相交温度。最后,根据本文及稳定平衡部分的计算结果,作者将现行铁碳相图加以修正,俾合于热力学的要求。但关于碳化铁在铁液内溶解度的计算仅属于初步近似性质,有待将来研究。     

STUDY ON THE STABILITY OF T＇ PHASE IN THE Al-Zn-Cu TERNARY SYSTEM

The phase constitutes and phase compositions in the eight alloys designed with different compositions of Al-Zn-Cu system have been determined after the homogenous treatment and then equilibrium cooling to 20~C by use of optical microscope, electron probe microanalysis and X-ray diffraction. It has been found that there existed the T‘phase in the seven alloys. Consequently, it was testified that the T‘ phase was stable at room temperature. At the same time, the phase relationship was not locally right for the isothermal section of 20℃ of Al-Zn-Cu system of the ASM published in 1997.     

AN INVESTIGATION ON PHASE DIAGRM OF TERNARY SYSTEM CeCl_3-BaCl_2-LiCl

ＡＮＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＰＨＡＳＥＤＩＡＧＲＭＯＦＴＥＲＮＡＲＹＳＹＳＴＥＭＣｅＣｌ＿３－ＢａＣｌ＿２－ＬｉＣｌＡＮＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＰＨＡＳＥＤＩＡＧＲＭＯＦＴＥＲＮＡＲＹＳＹＳＴＥＭＣｅＣｌ＿３－ＢａＣｌ＿２－ＬｉＣｌ￥Ｚｈ...     

THE ISOTHERMAL SECTIONS AT 1200℃ OF THE EQUILIBRIUM DIAGRAMS OF THE SYSTEMS Mo-Ti-Zr AND Mo-Nb-Zr

应用金相及X射线衍射方法,并辅之以硬度测量研究了Mo-Ti-Zr,Mo-Nb-Zr两三元系的1200℃恒温截面。两合金系统的1200℃恒温截面很相似,包括一个单相区α及一个两相区(α+ε)。在Mo-Ti-Zr系中α为体心立方Mo-Ti-Zr三元固溶体,其点阵常数随固溶体中钛、铅含量的增加而增大,ε为三元Laves相(Ti,Zr)Mo_2,其结构与ZrMo_2相同。在Mo-Nb-Zr系中α为体心立方Mo-Nb-Zr三元固溶体,其点阵常数也随固溶体中铌、锆含量增加而增加,ε为具有MgCu_2型结构的三元Laves相Zr(Mo,Nb)_2。在Mo-Ti-Zr三元系中,随着钛含量的增加,合金的等硬度曲线呈半环状向钛角扩展,在Mo-Nb-Zr三元系中,随着铌含量的增加,合金的等硬度曲线也呈半环状向铌角扩展。