高圧力下のAl-Si 系状態図(<小特集>高圧加工小特集)

概要

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A phase diagram of Al-Si system in the hypoeutectic region at 28 kb has been composed. A girdle-type high pressure device was used to press and heat the specimens, and an electric resistance method to detect the phase transitions. The characteristic figures obtained are as follows ; (1) The melting point of pure A1 has been elevated to 840℃ at 28 kb from 660℃ at 0 kb giving 6.4℃/kb as for the pressure derivative. The fiqures are very close to the experimental value of Jayaraman and also agrees approximately with a value 5.5℃/kb calculated from the Clausius-Clapeyron's thermodynamical relation. (2) The eutectic temperature of this system has been elevated from 577℃ at 0 kb to 660℃ at 28 kb giving 3.0℃/kb as for the pressure derivative. This value agrees fairly well with the calculated value 2.5℃ kb. (3) The solid solubility of Si at the eutectic temperature has been broadened to 7.0 at. % at 28 kb from 1.6 at. % at 0 kb. This value is comparable to the solubility 8.5 at. % calculated under the assumption of the dilute solid solution model using -5.5×10<-24>cm^3/atom as the change of molar volume per solute atom.
社団法人日本材料学会の論文
1971-08-15