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Phase transition and ordering behavior of ternary Ti–Al–Mo alloys using in-situ neutron diffraction

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Veröffentlicht/Copyright: 11. Juni 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 102 Heft 6

Abstract

Neutron diffraction has been used for in-situ investigations to elucidate the phase transformation behavior of two Mo-containing TiAl alloys with compositions of Ti-44Al-3Mo and Ti-44Al-7Mo (in at.%). Five different phases are present in these alloys. These include three ordered phases at room temperature, namely α2, β0 and γ and two disordered phases, and, which occur at higher temperatures. The sequence of the three phase transformations in each alloy has been determined. The phase transformation and disordering/ordering temperatures were determined on heating and cooling from the diffracted peak intensities. The neutron experiments are particularly sensitive to the order–disorder transitions in TiAl alloys, which are compared with the overall phase fractions obtained from previous high energy X-ray diffraction. Hysteresis and undercooling effects are observed for the various phase transformations and depend on the nature of atomic rearrangements.

Keywords: Phase diagram; Phase transformation; In-situ experiment; TiAl alloys; Neutron and synchrotron radiation
* Correspondence address, Dr. Klaus-Dieter Liss The Bragg Institute, ANSTO Locked Bag 2001, Kirrawee DC, NSW 2232, Australia New Illawarra Road, Lucas Heights, NSW 2234, Australia Tel.: +61 2 9717 9479 Fax: +61 2 9717 3606 Mobil: +419 166 978 E-mail: ;

Dedicated to Prof. F. D. Fischer on the occasion of his 70th birthday

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Received: 2010-12-23
Accepted: 2011-4-6
Published Online: 2013-06-11
Published in Print: 2011-06-01

© 2011, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110528
Schlagwörter für diesen Artikel
Phase diagram; Phase transformation; In-situ experiment; TiAl alloys; Neutron and synchrotron radiation

Artikel in diesem Heft

  1. Original Contributions
  2. Microstructure and adhesion of as-deposited and annealed Cu/Ti films on polyimide
  3. On the origin of inhomogeneous stress and strain distributions in single-crystalline metallic nanoparticles
  4. Contents
  5. Contents
  6. Editorial
  7. Editorial June 2011
  8. IJMR's most downloaded papers
  9. Original Contributions
  10. An excursion into the design space of biomimetic architectured biphasic actuators
  11. Strategies for fracture toughness, strength and reliability optimisation of ceramic-ceramic laminates
  12. Fracture statistics of brittle materials at micro- and nano-scales
  13. Martensitic phase transformations of nanocrystalline NiTi shape memory alloys processed by repeated cold rolling
  14. Variational modeling of shape memory alloys – an overview
  15. Phase-field approach to martensitic phase transformations: Effect of martensite–martensite interface energy
  16. Modelling of diffusive and massive phase transformations in binary systems – thick interface parametric model
  17. On the strength of grain and phase boundaries in ferritic-martensitic dual-phase steels
  18. A micro-level strain analysis of a high-strength dual-phase steel
  19. Thermodynamic description of niobium-rich γ-TiAl alloys
  20. Phase transition and ordering behavior of ternary Ti–Al–Mo alloys using in-situ neutron diffraction
  21. Microstructure evolution and mechanical properties of an intermetallic Ti-43.5Al-4Nb-1Mo-0.1B alloy after ageing below the eutectoid temperature
  22. Investigation of Cu precipitation in bcc-Fe – Comparison of numerical analysis with experiment
  23. Modeling interfacial effects on the thermal conduction behavior of short fiber reinforced composites
  24. Electronic origin of structure and mechanical properties in Y and Nb alloyed Ti–Al–N thin films
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