A Comprehensively Optimized Diagram in (Ga,In) (As,Sb) Reciprocal System

ＡＣｏｍｐｒｅｈｅｎｓｉｖｅｌｙＯｐｔｉｍｉｚｅｄＤｉａｇｒａｍｉｎ（Ｇａ，Ｉｎ）（Ａｓ，Ｓｂ）ＲｅｃｉｐｒｏｃａｌＳｙｓｔｅｍＬｉＪｉｎｇｂｏ，ＺｈａｎｇＷｅｉｊｉｎｇ，ＬｉＣｈａｎｇｒｏｎｇａｎｄＤｕＺｈｅｎｍｉｎ（李静波）（张维敬）（李长荣）（...     

Ternary Phase Equilibria at 450 °C in the Zn-Fe-P System

The 450 °C isothermal section of the Zn-Fe-P ternary phase diagram has been determined experimentally using optical microscopy, scanning electron microscopy (SEM) coupled with energy dispersive x-ray spectroscopy (EDS), and x-ray diffraction (XRD). The research of the work has concentrated on the Zn-rich corner, which is relevant to galvanizing. Experimental results indicate that P solubility in liquid zinc and all four Fe-Zn compounds, including ζ, δ, Г₁, and Г, is limited at 450 °C. Fe₂P is found to be in equilibrium with the ζ and δ phases. Fe₃P is found to be in equilibrium with δ, Г₁, Г, and αFe, respectively. Liquid Zn is in equilibrium with the Fe₂P and FeP phases.     

Thermodynamic Analysis of Ga-As-Sb-C-H System and Design of MOVPE Process for Ga(As,Sb) Semiconductor

ＴｈｅｒｍｏｄｙｎａｍｉｃＡｎａｌｙｓｉｓｏｆＧａＡｓＳｂＣＨＳｙｓｔｅｍａｎｄＤｅｓｉｇｎｏｆＭＯＶＰＥＰｒｏｃｅｓｆｏｒＧａ（Ａｓ，Ｓｂ）ＳｅｍｉｃｏｎｄｕｃｔｏｒＬｉＪｉｎｇｂｏ，ＺｈａｎｇＷｅｉｊｉｎｇ，ＬｉＣｈａｎｇｒｏｎｇａｎｄＤ...     

Al-Cu-Mg合金相图的计算

应用Levenberg-Marquardt(LM)算法进行了Al-Cu-Mg三元合金相图的计算.计算所得的三元Al-Cu-Mg合金相图与实验相图吻合很好,而且其对初始值的选取不敏感.     

Thermodynamic Analysis of In As Sb C H System and Design of MOVPE Process for In(As,Sb) Semiconductor

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＩｎ（Ａｓ,Ｓｂ）ｓｅｍｉｃｏｎｄｕｃｔｏｒｓａｒｅｉｎｔｅｒｅｓｔｉｎｇｄｕｅｔｏｔｈｅｉｒｐｏｓｉｂｌｅｕｓｅｉｎｉｎｆｒａｒｅｄｌｉｇｈｔｓｏｕｒｃｅｓ,ｄｅｔｅｃｔｏｒｓａｎｄｍｉｃｒｏｗａｖｅｄｅｖｉｃｅ...     

Phase Equilibria of the Nd-Fe-B Ternary System

Nd-Fe-B-based alloys as sintered Nd₂Fe₁₄B-typed permanent magnets have been studied extensively due to their excellent magnetic properties. In this work, the experimental information on the corresponding phase equilibria of the Nd-Fe-B ternary system in the published literature is reviewed first. The key Nd-Fe-B alloys annealed at 873 and 1073 K were then investigated experimentally to determine the phase equilibria of the system using x-ray diffraction technique and scanning electron microscope (SEM) with energy dispersive spectrometry (EDS). The ternary intermetallic compound, Nd₂Fe₁₄B with space group P4₂/mnm as Nd₂Fe₁₄B structure type, NdFe₄B₄ with space group Pccn as RE_l.11Fe₄B₄ structure type and Nd₅Fe₂B₆ with space group R \( \overline{3} \) m as Pr₅Co₂B₆ structure type were confirmed at 873 and 1073 K. The binary intermetallic compound Nd₅Fe₁₇ is stable at 873 K, while it was not found at 1073 K. The phase equilibria of the Nd-Fe-B ternary system consists of 14 single-phase regions, 28 two-phase regions and 16 three-phase regions at 873 K, while there are 8 single-phase regions, 14 two-phase regions and 7 three-phase regions at 1073 K except for the B-rich part.     

Phase Equilibria of the Cu-Sn-Bi Ternary System

Phase equilibria of the Cu-Sn-Bi ternary system have been investigated by means of x-ray diffraction, scanning electron microscopy and energy-dispersive spectrometry analysis. Cu-Sn-Bi alloys were prepared and equilibrated at 250, 450 and 700 °C, and the equilibrium phases were experimentally identified. Isothermal sections at these three temperatures were proposed based on the experimental results and the information on the three constituent binary systems. Moreover, the solubility of the Bi in the Cu-Sn compounds is less than 0.8 at%. No ternary compound was found. The phase equilibria between the liquid and the solid phases appears to be inclined towards the Bi-corner at all temperatures.     

Phase Equilibria in the Cu-Sn-Sb Ternary System

The phase equilibria in the Cu-Sn-Sb ternary system were investigated by means of electron-probe microanalysis and x-ray diffraction. Firstly, ternary solubilities of η-Cu₆Sn₅, δ-Cu₄₁Sn₁₁, Cu₁₁Sb₃, ε-Cu₃Sb and η-Cu₂Sb, were less than 7 at.% Sb or Sn at 400 °C. Besides, an re-stabilized ternary solubility, Cu₆(Sn,Sb)₅, was detected with a homogeneity range of Cu: 52.9-53.3 at.%, Sn: 28.4-30.9 at.%, and Sb: 15.8-18.7 at.%. Its origin was traced back to high-temperature stabilization of the binary η-Cu₆Sn₅ phase. Thirdly, the metastable phase, Cu₁₁Sb₃, was observed at 400 °C in the Cu-Sn-Sb ternary system; On raising the temperature to 500 °C, the ε-Cu₃Sn phase still retained a large solubility for Sb, at?~?16 at.%, while the ε-Cu₃Sb was replaced by β-Cu₃Sb with a dual-cornered large homogeneity range. Similarly, a ternary homogeneity range of Cu: 83.8-84.9 at.%, Sn: 2.6-6.2 at.%, and Sb: 9-12.5 at.%, was found and deduced to be the high temperature stabilization phase of γ-Cu₁₁(Sb,Sn)₂ at 500 °C.     

Experimental Investigation and Thermodynamic Calculation of Phase Equilibria in the Mg-Pb-Sn Ternary System

The phase equilibria of the Mg-Pb-Sn ternary system were investigated using a combined method of electron probe microanalyzer and x-ray diffraction. Three isothermal sections of the Mg-Pb-Sn ternary system at 200, 300 and 400 °C were experimentally established. The phase equilibria of Mg-Pb-Sn ternary system were thermodynamically assessed by using CALPHAD (Calculation of Phase Diagrams) method on the basis of the presently determined experimental data. A consistent set of thermodynamic parameters has been derived for describing the Gibbs free energies of each solution phase and intermetallic compound in the Mg-Pb-Sn ternary system. The calculated phase diagrams and thermodynamic properties in the Mg-Pb-Sn ternary system are in good agreement with experimental data.     

Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Cu-Nb-Zr Ternary System

The phase equilibria of the Cu-Nb-Zr ternary system at 900, 1000 and 1100 °C were experimentally investigated by optical microscopy and electron probe microanalysis on the equilibrated alloys. Combined with the obtained experimental results, the phase equilibria of Cu-Nb-Zr ternary system were thermodynamically optimized using the CALPHAD (calculation of phase diagrams) method. The Gibbs free energies of the phases in the present work were described by appropriate models. A consistent set of the thermodynamic parameters leading to reasonable agreement between the calculated data and experimental results was obtained in the Cu-Nb-Zr ternary system.     

Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Al-Bi-Sn Ternary System

This work first deals with the experimental investigation and thermodynamic calculation in the Al-Bi-Sn ternary system. The phase equilibria at 400 and 500 °C in the Al-Bi-Sn ternary system have been experimentally determined by electron probe microanalysis (EPMA) on the equilibrated alloys. Based on the experimental data determined in the present work, the phase equilibria in the Al-Bi-Sn ternary system have been thermodynamically assessed by using the CALPHAD (CALculation of PHAse Diagrams) method, and a consistent set of thermodynamic parameters leading to reasonable agreement between the calculated results and experimental data was obtained. The additions of Sn can effectively reduce the stable liquid miscibility gap in the Al-Bi binary system and gradually decrease its critical temperature. And the additions of Bi can significantly stabilize the metastable liquid miscibility gap in the Al-Sn binary system. This is shown by an initial decrease in critical temperature with increasing Bi additions.     

Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Cr-Hf-Ti Ternary System

The phase equilibria of the Cr-Hf-Ti ternary system has been firstly investigated by electron probe micro-analyzer, x-ray diffraction and differential scanning calorimetry on equilibrated alloys. Three isothermal sections of the Cr-Hf-Ti ternary system at 1100, 1200 and 1300 °C were determined. Meanwhile, this ternary system was also thermodynamically optimized using the calculation of phase diagrams method. The calculated result replies that the existing temperature range of the C15 (Cr₂Hf) increased due to addition of the third element Ti.     

Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Bi-Cu-Zn Ternary System

The phase equilibria of the Bi-Cu-Zn ternary system has been firstly and comprehensively investigated by electron probe microanalyzer (EPMA) with equilibrated alloys. Two isothermal sections of the Bi-Cu-Zn ternary system at 500 and 650 °C were determined. Based on the experimental data of phase equilibria, the Bi-Cu-Zn ternary system was also thermodynamically optimized using the Calculation of Phase Diagrams (CALPHAD) method. The experimental result shows that Bi is almost insoluble in the Cu-Zn binary compounds and (Cu) phase. It is found that the critical temperatures of the miscibility gaps in the Bi-Cu and Bi-Zn binary systems gradually increase with the increasing of the third element Zn or Cu additions. Moreover, the composition range of the liquid miscibility gap gradually reduces with the temperature increasing.     

Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Co-Cu-V Ternary System

The phase equilibria of the Co-Cu-V ternary system at 900, 1000, 1100 and 1200 °C have been experimentally determined by optical microscopy and electron probe micro-analysis of the equilibrated alloys. The phase transformations were investigated by means of the differential scanning calorimetry. Based on the experimental data of phase equilibria and thermodynamic properties, the thermodynamic assessment of the Co-Cu-V ternary system was carried out by using the calculation of phase diagrams method. A consistent set of the thermodynamic parameters leading to reasonable agreement between the calculated results and experimental data was obtained in the Co-Cu-V ternary system. Meanwhile, the calculated results show that the critical temperature of metastable magnetically induced miscibility gap of (α _f Co) and (α _p Co) phases in the Co-V system gradually decreases with increasing Cu composition in the range of 0-3 wt.% additions.     

Experimental Investigation of Phase Equilibria in the Fe-Si-Ti Ternary System

The phase equilibria of the Fe-Si-Ti ternary system were investigated by electron probe microanalyzer (EPMA), back scattered electron (BSE) and X-ray diffraction (XRD) on the equilibrated alloys. Twenty-four alloys of the Fe-Si-Ti ternary system were prepared. In this study, three isothermal sections of the Fe-Si-Ti ternary system at 1000, 1100 and 1200 °C were respectively determined and seven ternary compounds were confirmed. The ηFe₅Si₃ phase is discovered at 1100 and disappeared at 1200 °C. The obtained experimental results show that there is large solubilities of Si in the TiFe₂ phase. The newly determined phase equilibria of the Fe-Si-Ti system will provide useful information for the development of silicon steels.     

Experimental Investigation of Phase Equilibria in the Cu-Fe-Zr Ternary System

The phase equilibria in the Cu-Fe-Zr ternary system was experimentally investigated by optical microscopy, electron probe micro-analyzer and x-ray diffraction on the equilibriated alloys. Three isothermal sections of the Cu-Fe-Zr ternary system at 1000, 1100 and 1200 °C were experimentally determined, and no ternary compound was found in this system. The further result in the present work shows that the Fe₂₃Zr₆ phase in the Cu-Fe-Zr ternary system is an equilibrium phase rather than oxygen-stabilized phase.     

Experimental Determination of Phase Equilibria in the Co-Cr-V Ternary System

The phase equilibria in the Co-Cr-V ternary system were investigated by means of optical microscopy, electron probe microanalysis and x-ray diffraction. Four isothermal sections of the Co-Cr-V ternary system at 800, 1000, 1100 and 1200?°C were established. The experimental results show that: (1) no ternary compound was found in this system; (2) the ?? and (V, Cr) phases form the continuous solid solutions from the Co-Cr side to Co-V side in the isothermal sections at 800-1200?°C.     

Experimental Investigation of Phase Equilibria in the Ni-Cr-Si Ternary System

Phase equilibria of the Ni-Cr-Si ternary system at 1000 and 1100 °C have been experimentally investigated by means of electron probe microanalyzer (EPMA) and x-ray diffraction (XRD) analysis on the equilibrated alloys. In the present work, the existence of the ternary compounds of σ (Cr₁₃Ni₅Si₂), π (Cr₃Ni₅Si₂), τ₁ (Cr₂Ni₂Si) and τ₂ (Cr₃Ni₃Si₄), at both 1000 and 1100 °C is confirmed. The binary γ (Ni₃₁Si₁₂), δ (Ni₂Si), and CrSi phases exhibit a considerable solubility of a third element. Additionally, a liquid phase region is found at 1100 °C in the ranges of 15.5-21.3 at.% Cr and 22.1-25.1 at.% Si.     

Experimental Investigation of Phase Equilibria in the Fe-Si-Zr Ternary System

The phase equilibria of the Fe-Si-Zr ternary system at 1273 and 1373 K have been experimentally investigated using scanning electron microscopy, electron probe microanalyzer and x-ray diffraction. In the present study, the established isothermal sections are characterized by a series of binary phases, ternary compounds and solid solutions. FeZr₂ and SiZr₂ do not form a continuous solid solution at 1273 and 1373 K. A new phase denoted here as τ₉ (29Fe42Si29Zr) was found at both temperatures. The measured composition of the τ₈ phase agrees with the formula Fe₄Si₂Zr found in the previous structural investigations. The newly determined phase equilibria of the Fe-Si-Zr system will provide important information for the development of silicon steels.     

Mo-Ti-Ru三元系相平衡的实验研究

本研究利用电子探针成分分析和X射线衍射分析等技术建立Mo-Ti-Ru三元系的1100°C和1300°C等温截面相图,实验结果表明：(1)在1100℃等温截面相图中存在三个三相区,而1300℃等温截面相图中存在两个三相区;(2)在1100℃等温截面中,由于Ti的加入,σ-Mo₅Ru₃相被稳定化并形成一个小单相区;(3)在1100℃和1300℃等温截面相图中,(βTi, Mo)相均从富Mo侧一直延伸至富Ti侧,并且具有较大的固溶度。Mo-Ti-Ru三元系相平衡的测定为Ti基合金热力学数据库的建立提供基础理论信息。