On the Corrosion Resistance of Titanium Alloys (3rd Report). The Equilibrium Diagram of the Titanium-Palladium System

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  • チタニウム-パラヂウム2元系平衡状態図について
  • チタニウム-パラジウム 2ゲンケイ ヘイコウ ジョウタイズ ニ ツイテ

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Abstract

The equilibrium diagram of the titanium-palladium system has been investigated in the whole range of its composition by metallographic examination, X-ray analysis, and the measurements of melting points. The diagram obtained from the experimental results is shown in Fig. 5. Only an intermediate compound (TiPd3) was found to exist. The crystal structure of TiPd3 is of hexagonal DO24 type, and a=5.489 A, c=8.964 A and c⁄a=1.635. An eutectic reaction L\ ightleftarrowsβ+TiPd3 occurs at 47% palladium and 1080°, a peritectic reaction L+TiPd3\ ightleftarrowsγ (Pd) at 89% palladium, and an eutectoid reaction β\ ightleftarrowsα+TiPd3 at approximately 25% palladium and 735°. The solubility of palladium in beta-titanium is approximately 45% at the eutectic temperature and the solubility of palladium in alpha titanium is 5% at the eutectoid temperature. Also the solubility of titanium in gamma palladium is 11% at 1000°.

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