Thermodynamic Optimization of the Sc-X (X = La, Li, Ca, Cr) Systems

The Sc-X (X = La, Li, Ca, Cr) systems have been thermodynamically assessed by means of the CALPHAD (CALculation of PHAse Diagram) method. For each of the binary systems, a set of self-consistent thermodynamic parameters has been obtained. Comparisons between the calculated and measured phase diagrams show that the experimental data are satisfactorily accounted for by the present thermodynamic modeling.     

Thermodynamic Optimization and Calculation of the HoCl3-MCl (M = Na, K, Rb, Cs) Systems

According to measured experimental phase diagram data and thermodynamic data, the HoCl₃-MCl (M = Na, K, Rb, Cs) phase diagrams were determined by the CALPHAD technique. The Gibbs energies of liquid phases in these systems have been optimized and calculated by the modified quasi-chemical model in the pair-approximation for short-range ordering. A series of thermodynamic functions have been optimized and calculated on the basis of an interactive computer-assisted analysis. The results show that the thermodynamic properties and phase diagrams are self-consistent. The optimized results for the systems are discussed.     

Phase Relations in Si-Al-M-O-C (M = Zr,Mg) Systems

The present work determined the phase relations in Si-Al-M-O-C (M = Zr, Mg) systems, involving SiC-Al₂O₃-ZrO₂, SiC-Al₂O₃-MgO, SiC-SiO₂-Al₂O₃-ZrO₂ and SiC-SiO₂-Al₂O₃-MgO systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Al₂O₃, ZrO₂, MgO and SiO₂. Within these systems, SiC was respectively compatible with other neighboring phases, forming a set of four-phase compatibility tetrahedrons. The subsolidus phase diagrams of the SiC-SiO₂-Al₂O₃-ZrO₂ and SiC-SiO₂-Al₂O₃-MgO quaternary systems were presented.     

原位合成(Ti,V)C/Fe基复合材料

采用粉末冶金与原位合成相结合的方法制备了(Ti,V)C/Fe复合材料,用X射线衍射(XRD)、扫描电镜(SEM)研究了该复合材料的物相结构和显微组织,用MM-200磨损试验机对复合材料进行了耐磨性实验.结果表明,复合材料的相组成为(Ti,V)C和a-Fe;合成的硬质相(Ti,V)C颗粒细小,在珠光体基体中均匀分布;在重载干滑动磨损条件下,该复合材料显示了很好的耐磨性能.     

Fe0.85Mn0.15Ti0.9M0.1（M=Zr,V,Ca）合金的贮氢性能

系统地研究了Ｆｅ０．８５Ｍｎ０．１５Ｔｉ０．９Ｍ０．１（Ｍ＝Ｚｒ,Ｖ,Ｃａ）合金的贮氢性能。研究结果表明：Ｆｅ０．８５Ｍｎ０．１５Ｔｉ０．９Ｚｒ０．１合金在室温下经几分钟的孕育期就可吸氢,但合金在氢化过程中形成了氢含量很高的α相,导致合金的贮氢量降低,同时还使ｐ－ｃ－Ｔ曲线的平台特性变差;Ｆｅ０．８５Ｍｎ０１５Ｔｉ０．９Ｖ０．１合金的活化性能进上步得到改善,在室温下几乎不需要孕育期就可以吸氢,但同     

Structure and hydrogen sorption properties of (Ti,Zr)–Mn–V alloys

The present investigation is a part of the series of works on the development of new materials as highly efficient hydrogen accumulating media. Earlier we reported on the investigation of Ti–Mn–V alloys of Laves phase type. This work is the continuation of these studies. The work was aimed on the determination of concentration boundaries of Laves phase and investigation of hydrogen sorption properties of alloys. Using X-ray, EDXA and electron microscopy methods the phase compositions of over 50 alloys were studied. The Laves phase concentration boundaries were determined to extend up to 26 at.% of vanadium. Compared to ternary Ti–Mn–V system the region of λ₁-phase is about 2 at.% wider for Ti–Mn side of concentration triangle. Depending on metal concentrations lattice parameters were determined to increase proportionally with increasing titanium or vanadium concentration according to Vegard rule. The interaction of alloys with hydrogen was studied by PC-isotherm method. The isotherms were measured at three different temperatures and thermodynamic parameters of reaction were calculated using the vant Hoff equation. The hydrogen sorption properties were analysed in view of overall alloy composition. The enthalpy of desorption was found to depend proportionally on unit cell volume of alloy.     

纳米(Ti,Ni,Fe)-Al金属间化合物及其复合材料研究进展

(Ti，Ni，Fe)-Al金属间化合物具有优良的性能，在航空材料和中高温结构材料等领域内具有重要的应用价值。采用机械合金化制备、合成纳米金属间化合物及其复合材料有望克服金属间化合物固有的室温脆性及高温蠕变强度低的缺陷。本文综合评述了国内外在纳米(Ti，Ni，Fe)-Al金属间化合物及其复合材料的机械合金化合成及其烧结固化与力学性能等方面所取得的主要研究成果，并就该研究领域的不足之处及其今后的发展方向提出了一些看法。     

THERMODYNAMICS OF Cu-Y-M(M=Al,Si,Ti,Fe)LIQUID SOLUTIONS

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｙ－Ｍ（Ｍ＝Ａｌ，Ｓｉ，Ｔｉ，Ｆｅ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｂｅｉｊｉｎｇ１０００８１）Ａｂ...     

Structure of martensite in sputter-deposited (Ni,Cu)-rich Ti–Ni–Cu thin films containing Ti(Ni,Cu)2 precipitates

The martensite structure in sputter-deposited thin films of Ti_48.6Ni_35.9Cu_15.5 was studied. The Ti(Ni,Cu)₂ phase precipitates during the annealing process. Fine Ti(Ni,Cu)₂ precipitates can be deformed by the shear deformation of martensitic transformation, but they obstruct the movement of the twin boundaries to some extent. Coarse Ti(Ni,Cu)₂ precipitates seriously impede the growth of martensite plates and lead to a rectangular-cell-like structure of martensite in the film annealed at 873 K. The resistance of Ti(Ni,Cu)₂ precipitates to the growth of the martensite plates enhances with the coarsening of Ti(Ni,Cu)₂ precipitates, which is one of the reasons for the decrease in the maximum recoverable strain with increasing annealing temperature. B19′ martensite with (0 0 1) compound twinning is frequently observed near coarse Ti(Ni,Cu)₂ precipitates and grain boundaries in films annealed at 873 and 973 K. The local stress concentration should be responsible for the presence of B19′ martensite.     

（Zr,Ti）（V,Mn,Pd,Ni,Fe）2系贮氢电极合金的循环稳定性

（Ｚｒ，Ｔｉ（Ｖ，Ｍｎ，Ｐｄ，Ｎｉ，Ｆｅ）２系贮氢电极合金具有较高的电化学容量。在充放电循环过程中，发生合金组元有选择地溶了，致使合金Ｃ１４７主相结构严重畸变，逐渐丧失了可逆贮氢能力。     

Thermodynamic Assessments of Ternary Ga-As-P,Ga-P-Sb,In-As-P and In-P-Sb Systems

1 ＩｎｔｒｏｄｕｃｔｉｏｎＭｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏⅢ Ⅴｓｅｍｉｃｏｎｄｕｃｔｏｒｃｏｍｐｏｕｎｄｓｆｏｒｄｅｃａｄｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｉｍｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｓｉｎｏｐｔｏｅｌｅｃｔｒｏｎｉｃａｎｄｈｉｇｈｓｐｅｅｄｅｌｅｃｔｒｏｎｉｃｄｅ ｖｉｃｅｓ .Ｔｈｅｍａｔｅｒｉａｌｓｏｒｄｅｖｉｃｅｓｃａｎｂｅｇｒｏｗｎｂｙｌｉｑｕｉｄｐｈａｓｅｅｐｉｔａｘｙ (ＬＰＥ ) ,ｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔｉｏｎ(ＣＶＤ) ,ｍｏｌｅｃｕ ｌａｒ…     

Effect of electrospark dispersion on the martensitic transformation in Co—Fe—Ni—Ti—(Cu) alloys

The effect of electrospark dispersion on the γ ai α matensitic transformation in Co-Fe-Ni-Ti-(Cu) alloyshas been studied. A relationship between the lattice parameters of the initial γ phase (austenite), the structure of the arising α martensite, the temperature of the onset of the martensitic transformation M _s , and the temperature hysteresis of the martensitic transformation ΔT has been established.     

Mg1.7M0.3(M＝Mg,Ti,Al)Ni贮氢合金结构及性能研究

采用固态烧结法制备了Mg1 7M0 3(M =Mg、Ti、Al)Ni贮氢合金 ,X射线衍射分析结果表明 ,适当提高烧结温度有利于Mg2 Ni相的形成 ;Ti对Mg的取代未引起合金相结构的明显变化 ,而Al取代Mg除有Mg2 Ni相外 ,还有一呈立方晶体结构的新相生成。Ti、Al对Mg的取代 ,不仅提高了Mg2 Ni合金的放电容量 ,同时也提高了合金的循环寿命。     

Thermodynamic properties of the Al–Fe–Ni system acquired via a hybrid approach combining calorimetry,first-principles and CALPHAD

A reaction calorimeter coupled with first-principles calculations was employed to obtain enthalpies of formation for τ₁ (Al₉FeNi) and τ₂ (Al₁₀Fe₃Ni) compounds. The previous thermodynamic model for describing the disorder/order transition (fcc_A1/L1₂) in the Al–Fe–Ni system was modified to extrapolate this model to quaternary and higher-order systems. The first-principles energy calculations for the end-members of sub-lattice models in ternary compounds and L1₂ phase were performed to facilitate subsequent modeling. The existence of the experimentally observed miscibility gap for ternary B2-ordered phase is detected by the present calculation. Such a feature cannot be identified with available thermodynamic software due to the tiny difference between the Gibbs energies associated with different phase assemblages. A set of thermodynamic parameters for the Al–Fe–Ni system was obtained via thermodynamic modeling. Numerous experimental data including phase diagram, thermodynamic properties and site occupation of Fe in B2 phase are well accounted for by the present modeling.     

BaZrO3耐火材料与TiM(M=Fe,Ni)熔体的界面反应

以TiO2作为助熔剂,采用等静压成型技术配合固相烧结技术制备了BaZrO3坩埚,并用制备的BaZrO3坩埚采用真空感应熔炼技术进行了TiM(M=Fe,Ni)熔炼试验.通过对熔炼后的合金铸锭与坩埚的界面区域进行的宏观分析、SEM微观形貌观察、EDS分析,发现熔体对坩埚不造成侵蚀,坩埚材料也不污染熔体,熔体与坩埚内壁之间无明显反应层存在.这将给BaZrO3耐火材料用作坩埚材料的TiFe和TiNi合金的真空感应熔炼工艺提供理论支持.     

Critical Systematic Evaluation and Thermodynamic Optimization of the Mn-RE System (RE = Tb,Dy, Ho,Er, Tm and Lu) with Key Experiments for the Mn-Dy System

Critical evaluation and optimization of all available phase diagrams and thermodynamic data for the Mn-RE (RE = Tb, Dy, Ho, Er, Tm, and Lu) systems has been conducted to obtain reliable thermodynamic functions of all the phases in the systems. Key experiments for the Mn-Dy system were performed using DSC and solution calorimeter. In the thermodynamic modeling, it is found that the Mn-RE systems show systematic changes in the phase diagrams and thermodynamic properties such as enthalpy of mixing in liquid state in the order of periodic number in the lanthanide series. The systematic thermodynamic modeling approach for RE elements allow to resolve inconsistencies in the experimental data and estimate unknown thermodynamic properties and phase equilibria of Mn-RE system.