Isothermal Phase Diagrams of Binary Alloys and Two Oxidants

An example of an isothermal thermodynamic phase diagram of a quaternary system composed of a binary alloy and two oxidants has been calculated under appropriate values of the stability of the corresponding compounds, assuming that each metal forms only one compound with each oxidant. Initially, two-dimensional sections of the complete three-dimensional diagram made along planes corresponding to constant values of one of the variables involved were examined in detail. The actual structure of this type of three-dimensional diagram was then discussed by analyzing the shape and the boundaries of the various regions corresponding to the conditions of stability of each phase taken separately or in combination with other phases.     

Structural and Phase Transformations in Titanium Alloys

Metal Science and Heat Treatment -     

An Ultrasonic Study of Phase Transformations in Titanium and Titanium Alloys

Metal Science and Heat Treatment -     

Phase Diagrams of Commercial Aluminum Alloys

Metal Science and Heat Treatment -     

钛合金等温锻造技术研究进展

等温锻造技术是国际上一种先进的近成形／近净成形工艺，本文重点介绍了钛合金等温锻造技术的特点、工艺设计、模具设计与制造以及钛合金等温锻造技术的应用现状和发展前景。     

Au-Pd-Zr合金的相图计算及实验验证

利用相图计算软件Pandat计算了Au-Pd-Zr合金的液相面投影图、室温(25℃)的等温截面图、xAu-xPd-Zr合金系的垂直截面图,同时选取了36Au-36Pd-28Zr(at%)合金,基于相图计算与实验验证相结合的方法,研究了该合金的相平衡以及凝固过程。利用光学显微镜、扫描电镜、能谱仪对该合金的室温平衡相组成进行了验证。结果表明,相平衡热力学计算结果与实验结果比较吻合,36Au-36Pd-28Zr合金的凝固顺序为:L→L+Pd3Zr→L+Pd3Zr+ZrAu2→Pd3Zr+ZrAu2+ZrAu3。     

相图及其在钛电解新工艺和钛合金设计中的应用

相图是材料设计的指导书、冶金工作者的地图和热力学数据的源泉。简要概述了近年来相图计算研究的进展,举例说明了Ti-C-O三元系及其亚二元系相图在钛电解新工艺研究中的应用及Ti-Al相图在钛合金设计中的应用,并在文献中列出了新的可靠的合金和化合物相图的来源。最后指出,进一步测定Ti-C-O三元系中TiC-TiO固溶体的精确固溶范围及其与其它相的相关系对于直接电解TiO2提取金属钛新工艺的工业化有重要意义。     

TiAl基双相合金等温转变的动力学

利用定量金相和Ｘ射线衍射的方法研究厂过饱和有序α２相等温转变的动力学。两种方法所测得的γ相析出量与等温处理时间的关系相互吻合。Ｔｉ－４５Ａｌ合金的等温转变速度明显高于Ｔｉ－４２Ａｌ合金。在相图中的共析转变温度以下，转变速度随温度的降低而减小，没有出现Ｃ字形等温转变曲线的可能性。     

Phase Transformations in Low-Fe Alloys of the Al-Cu-Fe System

Microstructure and phase transformation in the Al-Cu-Fe alloys of the approximate compositional range of 20-50 at.% Cu and 2 - 10 Fe at.% have been investigated from samples quenched from their respective temperatures by means of different thermal analysis, magnetothermal analysis, scanning electron microscopy, electron probe analysis and powder X-ray diffraction. Representative phase transformations categorized as polymorphic, discontinuous precipitation,quasi-binary eutectoid, and ternary transitional U-type phase transformation are presented. These phase transformations were found to have a common feature which consumes the β phase and appears the φ phase. A schematic diagram was proposed to demonstrate the transition processes with decreasing temperature.     

La-Ni-Cr三元系600℃等温截面的相关系

用X射线粉末衍射法，差热分析法和金相分析法测定了La-Ni-Cr三元系600℃等温截面的相关系。结果表明：此截面由10个单相区、17个两相区和8个三相区组成。在本实验条件下未发现新的三元化合物，没有观察到化合物Cr，Ni3和Cr3Ni2的谱线；化合物La3Ni的谱线是由La和La7Ni3的谱线相叠加；没有观察到LaNi2，而观察到La7Ni16的存在。Ni在Cr中的最大固溶度大约为3at％，Cr在Ni，LaNi5，La2Ni7，LaNi3，La2Ni3，LaNi和La7Ni3中的最大固溶度(at%)分别约为35，20，15，8，9，9和6，Cr在La7Ni16中的固溶度几乎为零。     

钛合金固态相变的研究进展

综述了近年来国内外学者在钛合金固态相变理论和实验研究方面的进展情况，介绍了几种钛合金固态相变的研究实验方法，并对钛合金中马氏体、硼、亚稳脚分解等相变动力学、晶体学以及组织的演变、形核生长等进行了总结和归纳。     

锌基合金热力学和相图数据库的建立

利用Visual Basic 6.0软件开发了一套锌基合金体系热力学和相图数据库系统,用于收集、整理锌基合金体系的热力学和相图相关信息.利用该软件系统可以实现对锌基合金体系热力学和相图数据的排序、查询和打印等功能,也可实现数据库的实时更新.探讨了如何实现该软件系统的各项功能,解决了锌合金体系热力学和相图数据人工查询的低效率问题,该数据库软件在锌合金的改性和新型锌合金的设计与开发应用中具有一定使用价值.     

Thermodynamic Phase Diagrams of Ternary Alloys Exposed to a Single Oxidant

Oxidation of Metals - A simple example of an isothermal thermodynamic phase diagram for a quaternary system composed of a ternary A–B–C alloy reacting with a single oxidant (O) has been...     

Al-Li合金相变的热分析动力学表征

以Al-Li合金为对象,通过DSC技术研究了合金的相变.确定了相变温度范围、类型及其微观机理,确立了相变动力学计算方法,并以此计算了δ＇相的析出和溶解的激活能.研究表明：δ＇相析出为一级反应机制、δ＇相溶解则为三维扩散机制;在本实验条件下,δ＇相的析出激活能为188 kJ/mol～214 kJ/mol,δ＇相的溶解激活能为158 kJ/mol～228kJ/mol.根据实验和分析,可以认为采用热分析动力学方法能定量地表征Al-Li合金的相变.     

Phase Diagram of Alloys of the Fe - C - Mn System and Some Structural Effects in This System Part 2. Calculation and Construction of Isothermal Sections of the Diagram

Initial data for calculating isothermal sections of the phase diagram, a method for calculation with illustrations in the form of specific examples, calculation results in the form of isothermal sections of the diagram at 1485, 1473, 1250, 1225, 1200, 1175, 1160, 1000, 800, 700, 600, 570, 500, and 400°C, and results of an analysis of these isothermal sections in the form of some special features of structure formation in high-manganese alloys are presented. It is shown that the system possesses two four-phase nonvariant equilibria, i.e., a eutectic-peritectic equilibrium at about 1160°C and a eutectoid-peritectoid equilibrium at about 570°C.__________Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 3 – 9, April, 2005.