Inverse melting of metastable Nb–Cr solid solutions
| العنوان: | Inverse melting of metastable Nb–Cr solid solutions |
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| المؤلفون: | Carsten Michaelsen, Rüdiger Bormann, W. Sinkler, Th. Pfullmann |
| المصدر: | Journal of Applied Physics. 80:2156-2168 |
| بيانات النشر: | AIP Publishing, 1996. |
| سنة النشر: | 1996 |
| مصطلحات موضوعية: | Condensed Matter::Materials Science, Crystallography, Materials science, Sputtering, Transmission electron microscopy, Differential thermal analysis, Metastability, Enthalpy, General Physics and Astronomy, Thermodynamics, Thermal analysis, Amorphous solid, Solid solution |
| الوصف: | Metastable body‐centered‐cubic (bcc) Nb–Cr solid solutions were produced by mechanical alloying over a wide concentration range, and investigated by x‐ray diffraction, differential thermal analysis, and transmission electron microscopy. For comparison, metastable bcc and amorphous Nb–Cr alloys were fabricated by sputtering. Upon annealing, the solid solutions prepared by mechanical alloying undergo a transformation to an amorphous phase. The vitrification is polymorphous for a composition Nb45Cr55 whereas two‐phase mixtures of amorphous and bcc phases are formed for other concentrations, indicating that metastable equilibria between these two phases develop upon heat treatment. These results, combined with a detailed analysis of the thermodynamic functions of the system, reveal that the amorphous phase has a lower enthalpy and entropy than the bcc phase near equiatomic composition. In consequence, the Gibbs‐energy curves of bcc and liquid/amorphous Nb45Cr55 phases versus temperature exhibit two points of ... |
| تدمد: | 1089-7550 0021-8979 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::060fd660e35584acdce254088398d7de https://doi.org/10.1063/1.363048 |
| رقم الأكسشن: | edsair.doi...........060fd660e35584acdce254088398d7de |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Scitation. | تدمد: | 10897550 00218979 |
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