Abstract
The equilibrium diagram of the titanium-platinum system has been investigated in the whole range of the composition by metallographic examination, X-ray analysis, measurement of melting point, and differential thermal analysis. The diagram obtained from the experimental results is shown in Fig. 4. Three intermediate compounds (Ti3Pt), (TiPt), and (TiPt3) were found to exist. Among them the crystal structure of Ti3Pt is of β-walfram type, and TiPt3 is of face center cubic. An eutectic reaction\ ightleftarrowsLβ+Ti3Pt occurs at 43% platinum and 1310°, and an eutectic reaction L\ ightleftarrowsTi3Pt+TiPt3 at 68% platinum and 1320°, also an eutectic reaction L\ ightleftarrowsTiPt+TiPt3at 85% platinum and 1780°, and a peritectic reaction L+TiPt3\ ightleftarrowsγ (Pt) at approximately 95%platinum. An eutectoid reaction β\ ightleftarrowsα+Ti3Pt occurs at 12% platinum and 840°. The solubility of platinum in beta titanum is approximetely 30% at the eutectic temperature and 10% at 1000°, and the solubility of platinum in alpha titanium is 2% at the eutectoid temperature.
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