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Microstructure and phase relations for Ti-Mo-Al alloys

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Abstract

The influence of aluminum additions to a Ti-7 at. pet Mo alloy on the phase equilibria was investigated. The microstructures of the alloys, Ti-7 pct Mo-7 pct Al and Ti-7 pct Mo-16 pct Al, were determined by light and electron microscopy. It was found that with increasing aluminum concentration the formation of the metastable w phase was suppressed. In the Ti-7 pct Mo-16 pct Al alloy the β phase decomposed upon quenching by precipitating coherent, ordered particles having a B2 type of crystal structure (β2). At low temperatures the equilibrium phases for this alloy were β + α+ β 2, whereas at high temperature (850° to 950°C) the Ti3Al phase was in two-phase equilibrium with the β phase. The four-phase equilibrium which exists at a temperature of about 550°C involves the reaction β + Ti3Al ⇌ α + β2.

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Authors and Affiliations

  1. Department of Mechanics and Materials Science, Rutgers University, 08903, New Brunswick, N. J.

    T. Hamajima (Graduate Student) & S. Weissmann (Professor)

  2. DFVLR, PORZ-WAHN, Germany

    G. Luetjering

Authors
  1. T. Hamajima
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  2. G. Luetjering
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  3. S. Weissmann
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Additional information

G. LUETJERING, formerly Staff Member Materials Research Center, Allied Chemical Corp., Morristown, N. J.,

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Hamajima, T., Luetjering, G. & Weissmann, S. Microstructure and phase relations for Ti-Mo-Al alloys. Metall Trans 3, 2805–2810 (1972). https://doi.org/10.1007/BF02652846

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  • DOI: https://doi.org/10.1007/BF02652846

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