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Microstructural evolution and grain refinement in an intermetallic titanium aluminide alloy with a high molybdenum content

Paper presented at “XV International Conference on Electron Microscopy”, 15–18 September 2014, Cracow, Poland
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Published/Copyright: July 9, 2015
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 106 Issue 7

Abstract

As a strong β-stabilizing alloying element, Mo has gained importance for intermetallic β/γ-TiAl alloys. In general, TiAl alloys containing a significant volume fraction of the disordered body-centered cubic β-phase exhibit improved processing characteristics during hot-working. To increase the understanding of the alloying effect of Mo, a model alloy with the chemical composition Ti-44Al-7Mo-0.1B (in at.%) was investigated. In this work, the microstructural evolution after individual heat-treatment steps was studied by means of scanning as well as conventional and in-situ transmission electron microscopy. Additionally, macro-hardness and nanoindentation measurements were conducted to study the change in hardness due to grain refinement and solid-solution hardening. The variation of the observed macro- and nano-hardness corresponds well with the microstructural evolution. The obtained grain refinement effect leads to a significant increase in the macro-hardness, whereas the increase in the average nano-hardness of the individual phases is related to solid-solution hardening.

Keywords: Intermetallics; Titanium aluminides (TiAl); Transmission electron microscopy (TEM); Grain refinement; Hardness
*Correspondence address, Dr. Boryana Rashkova, Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstr. 12, 8700 Leoben, Austria, Tel.: +43 3842 402-4208, Fax: +43 3842 402-4202, E-mail:

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Received: 2014-10-15
Accepted: 2015-01-21
Published Online: 2015-07-09
Published in Print: 2015-07-04

© 2015, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111235
Keywords for this article
Intermetallics; Titanium aluminides (TiAl); Transmission electron microscopy (TEM); Grain refinement; Hardness

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase transitions induced by severe plastic deformation: steady-state and equifinality
  5. Dynamic precipitation of nickel-based superalloys undergoing severe deformation below the solvus temperature
  6. The influence of ECAP on microstructure evolution of aluminium alloys during in-situ heating in TEM
  7. An investigation into the effect of isothermal annealing on the structure (XRD), microstructure (SEM, TEM) and magnetic properties of amorphous ribbons and bulk amorphous plates
  8. Analysis of the structure (XRD) and microstructure (TEM, SEM, AFM) of bulk amorphous and nanocrystalline alloys based on FeCoB
  9. Preparation and characterization of silicon nanowires using SEM/FIB and TEM
  10. In-situ TEM heating of Ni/Al multilayers
  11. Microstructure and martensitic transformation in Ni48Mn39.5Sn12.5–xSix metamagnetic Heusler alloy ribbons
  12. Evolution of Fe-rich compounds in a secondary Al–Si–Cu alloy: influence of cooling rate
  13. Microstructural evolution and grain refinement in an intermetallic titanium aluminide alloy with a high molybdenum content
  14. Microstructure and properties of thick nanocomposite TiN/Si3N4 coatings on Vanadis 23 HS steel
  15. Influence of casting procedure on microstructure and properties of Mg alloy–glassy carbon particle composite
  16. Microstructural characterization of nanostructured supersonic sprayed Ni–Sn coatings after wear tests at elevated temperature
  17. On the wear of TiBx/TiSiyCz coatings deposited on 316L steel
  18. 3D reconstruction and characterization of carbides in Ni-based high carbon alloy in a FIB-SEM system
  19. Microstructural evolution in deformed duplex stainless steels
  20. Microstructure and interfacial reactions in the bonding zone of explosively welded Zr700 and carbon steel plates
  21. Microstructural characterization of second phases in X10CrMoVNb9–1 and 12CrMoWCuVNb steels after long steam exposure time at 550°C
  22. Short Communications
  23. Novel multilayer nano-composite protective coatings for metallic medical tools
  24. Microstructural changes in Cu-5.8 at.% In alloy caused by high pressure torsion
  25. Electron microscopy investigation of a cast AlSi9Mg aluminum alloy subjected to friction stir processing with overlapping passes
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