| Autor: |
Kornilov, I. I., Pylaeva, E. N., Volkova, M. A. |
| Zdroj: |
Russian Chemical Bulletin; July 1956, Vol. 5 Issue: 7 p787-795, 9p |
| Abstrakt: |
Summary 1.The phase diagram of the binary system Ti-Al was studied by the following methods: thermal analysis, microstructure analysis, x-ray structure analysis, hardness determination, and heat-stability determination.2.The following transformations occur in the Ti Al system: a) peritectic reactionß + melt ?? at 1520° between 29.5% and 37.5% Al;b) peritectic reaction? ? melt ? TiAl3 at 1400° between 60% and 64% Al; c) peritectoid reaction $ +? ?a at 1300° between 26% and 35% Al; d) temperature for the conversion ofa-phase intoß-phase rises from 870° at 0% Al to 1300° at 27.5% Al.3.At 1200° the solubility of aluminum in titanium is 26%, and at 800° it is 21.6%.4.Aluminum reduces the parameters of the lattice of thea solid solution:bara - from 2.95 to 2.881 kX;barc - from 4716 to 4.646 kX; and the ratio c/a rises almost linearly from 1.598 to 1.613.5.The hardness of titanium-aluminum alloys increases as the amount of aluminum dissolved in thebara-phase of titanium increases. The hardness of alloys lying in the?-phase region is considerably lower than the hardness of alloys lying in the region ofa solid solution.6.Investigation by the centrifugal method of the heat stability of alloys of the binary system at 550° and s = 15 kg/ sq.mm showed that the heat stability of alloys depends on their compositions and structures.7.As the concentration of aluminum in thea-titanium solid solution increases, the heat stability of the alloy increases.8.Maximum heat stability is possessed by alloys in the vicinity of the limit of solubility of aluminum in titanium. Alloys of the (a +?) two-phase region have low heat stability, as compared with alloys in the region of solid solutions. |
| Databáze: |
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