Thermodynamic properties of the chromium telluride Cr2Te3

Conclusions In an investigation, based on measurements of the emf of concentration galvanic cells, determinations were made of the isobaric-isothermal potential, heat, and entropy of formation of the chromium telluride Cr₂Te₃ over the temperature range 350–450°C.Translated from Poroshkovaya Metallurgiya, No. 9 (141), pp. 45–47, September, 1974.     

Waspaloy合金碳化物和γ'相析出规律的热力学计算

利用热力学计算软件Thermo-Calc对Waspaloy合金中可能析出的平衡相以及元素含量变化对其影响进行了计算分析.结果表明:碳含量的增加可以明显地提高碳化物的析出量,但对碳化物的析出温度的影响较小;γ'的析出量和析出温度均随Al、Ti含量的增加而增加,Al的影响尤为明显;Ti是MC的主要形成元素,Ti含量的增加可以提高MC的析出量,但对其析出温度无太大影响;M₂₃C₆的析出量不受Cr含量的影响,而析出温度却随着Cr含量的增加而提高.     

粉末高温合金平衡相析出行为的热力学对比

利用热力学平衡相计算方法及相应的高温合金数据库对René95,René88DT和an741нп三种合金在平衡相析出温度范围和析出量以及之间的关联性进行了系统的热力学计算对比分析.结果表明:三种粉末高温合金的平衡相种类基本相同,主要平衡相为γ,γ'和碳化物M₂₃C₆,MC,M₆C.René95合金中的碳化物含量要高于其他两种合金.зп741нп有着较高的γ'相析出温度和较大的析出量.随温度降低,Co和Nb从γ'相中析出,在其周围富集,其中зп741нп合金中尤为明显.合金元素的偏聚度也和合金的初熔点与终熔点之差的大小有关,其熔解区间越大即初熔点和终熔点之差越大,合金元素的偏聚度越大.     

Copper-scandium system: Thermodynamic properties of intermetallics and liquid alloys

Thermodynamic simulation of the binary Cu-Sc system is performed for a wide temperature range using experimental data on the thermodynamic properties of solid Cu-Sc alloys. The results obtained are used to estimate the thermodynamic functions of mixing and the activities of the components and to determine the composition of melts using an ideal solution model for interaction products. The calculated enthalpies of mixing at 1873 K agree adequately with the experimental data obtained by calorimetry.     

Thermodynamic properties of scandium-copper compounds

We have determined the Gibbs energy, the enthalpy, and the entropy of formation for the compounds ScCu₄, ScCu₂, and ScCu by measuring the emf of galvanic cells in the temperature range 845–980 K. We compared the experimental results obtained with known literature data. __________ Translated from Poroshkovaya Metallurgiya, Nos. 1–2(447), pp. 87–91, January–February, 2006.     

Thermodynamic properties of yttrium gernianwes

We have determined the Gibbs free energy, enthalpy, and entropy of formation for yttrium germanides by measuring the emf of high-temperature galvanic cells at 820–920 KInstitute of Materials Science, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 5–6, pp. 103–107, May-June, 1996. Original article submitted July 13, 1994.     

Thermodynamic properties of condensed silicides

An approximate generalized equation is obtained for the temperature dependence of the change in Gibbs energy in the atomization of condensed silicides; this equation takes account of the number of atoms present in the silicides and their calculated boiling points. For the 16 silicides considered, the discrepancy between the maximum calculated value and the mean is no more than 10%. On that basis, the proposed method may be used to verify data from other sources and also for approximate prediction of the thermodynamic properties of silicides that have not yet been studied.