Reactions with Silicon
The most recent, experimentally determined version of the phase diagram for the W-Si system is shown in Fig. 126. It is based on differential thermal analysis (DTA), X-ray, and microscopic studies as well as hardness measurements on W-Si alloy samples pre
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Reactions with Silicon
[23] Samsonov, G. V.; Epik, A. P. (Fiz. Met. Metalloved. 14 [1962] 479/80; Phys. Met. Metallogr. [Engl. Transl.] 14 No. 3 [1962] 144/5). [24] Kreimer, G. S.; Efros, L. D.; Voronkova, E. A. (Zh. Tekh. Fiz. 22 [1952] 858/73; C. A. 1956 7536). [25] Samsonov, G. V.; Burykina, A. L.; E'pik, A. P. (Zashch. Pokrytiya Met. 6 [1974] 5/24; Transl.: FDT-MT-24-1341-117 [1974] 3/33,7). [26] Samsonov, G. V.; Latysheva, V. P. (Fiz. Met. Metalloved. 2 [1956] 309/19; C.A. 1957 6258). [27] Samsonov, G. V.; Latysheva, V. P. (Dokl. Akad. Nauk SSSR 109 [1956] 582/5; C. A. 1957 9249). [28] Samsonov, G. V.; Solonnikova, L. A. (Fiz. Met. Metalloved. 5 [1957] 565/6; Phys. Met. Metallogr. [Engl. Transl.] 5 No. 3 [1957] 177). [29] Samsonov, G. V. (Bor Tr. Konf. Khim. Bora Ego Soedin., Moscow 1955 [1958], pp. 74/89; C.A. 196023564). [30] Pirani, M.; Sandor, J. (J. Inst. Met. 73 [1947] 385/95; Discussion (correspondence) 807/8). [31] Kashin, V. 1.; KLibanov, E. L.; TSilosani, A. G.; et al. (Izv. Akad. Nauk SSSR Met. 1971 No. 2, pp. 39/45; Russ. Metall. [Engl. Transl.] 1971 No. 2, pp. 25/30). [32] Jehn, H. (in: Fromm, E.; Gebhardt, E., Gase und Kohlenstoff in Metallen, Springer, Berlin - Heidelberg - New York 1976, pp. 552/63). [33] McCarty, L. V.; Donelson, R; Hehemann, R F. (Metall. Trans. A 18 [1987] 969/74). [34] Becker, J. A.; Becker, E. J.; Brandes, R. G. (J. Appl. Phys. 32 [1961] 411/23). [35] Schnitzel, R H. (Trans. Metall. Soc. AlME 233 [1965] 186/922). [36] Gerasimov, A. F.; Konev, V. N.; Timofeeva, N. F. (Fiz. Met. Metalloved. 11 [1961] 596/600; Phys. Met. Metallogr. [Engl. Transl.] 11 No. 4 [1961] 106/10).
9 Reactions with Silicon 9.1
Phase Diagram
The most recent, experimentally determined version of the phase diagram for the W-Si system is shown in Fig. 126. It is based on differential thermal analysis (DTA), X-ray, and microscopic studies as well as hardness measurements on W-Si alloy samples prepared by arc melting single-crystal Si with metal-ceramic (99.6% pure) or electron-beam-melted W [1]. However, the data points in the W rich region are consistently lower than the results of earLier investigations [2 to 9]. These results are the main basis of the assessed phase diagram in Fig. 127 from the recent review [10]. For previously reported phase diagrams and reviews see [11 to 22]. Thermochemical data and lattice stabiLity values of the pure elements were coupled to computl:! a phase diagram for, and an analytical description of, the W-Si system [23]. A thermodynamic evaluation of the W-Si system was carried out using a one-Lattice substitutional modeL to describe the Gibbs energy of the solution phases in the system. It was found that the phase diagram according to [1] couLd be represented by simpLe thermodynamic modeLs and seemed to be consistent with the existing thermodynamic properties of the compounds, while the other set of phase diagram data presented great difficulties in this respect [24]; see aLso the tabLe on p. 156. Second-order poLynomiaL equations for the soLidus and Liquidus at the W-ri
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