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  Can local hot spots induce α2/γ lamellae during incomplete massive transformation of γ-TiAl alloys?

Fischer, F. D., Cha, L., Dehm, G., & Clemens, H. J. (2010). Can local hot spots induce α2/γ lamellae during incomplete massive transformation of γ-TiAl alloys? Intermetallics, 18(5), 972-976. doi:10.1016/j.intermet.2010.01.017.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-56B0-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-56B1-8
Genre: Journal Article

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 Creators:
Fischer, Franz Dieter1, 2, Author              
Cha, Limei2, 3, Author              
Dehm, Gerhard4, 5, Author              
Clemens, H. J.6, Author              
Affiliations:
1Institute of Mechanics, Montanuniversität Leoben, A-8700 Leoben, Austria, ou_persistent22              
2Materials Center Leoben, Roseggerstrasse 12, A-8700 Leoben, Austria, ou_persistent22              
3Department of Physical Metallurgy and Materials Testing, Montan Universität, Leoben, Austria, ou_persistent22              
4Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
5Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
6Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria, ou_persistent22              

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 Abstract: Oil quenching is applied to a Ti-45Al-7.5b alloy (in at%) in order to investigate the occurrence of local ‘‘hot spots’’ during rapid cooling from the single a-phase region. After quenching the microstructure consists of large a2-Ti3Al grains and a small volume fraction of massively transformed gm-TiAl particles. The majority of the gm-particles show a featureless a2/gm interface, whereas in the immediate vicinity of some gm-particles lamellar a2/g-structures exist, exhibiting a Blackburn orientation relationship. The extension into the a2-parent grain is in the range of 1–10 µm. In this study it is investigated, if the diffusion-controlled formation of the g-laths is triggered by the release of latent heat during the a/gm transformation, which leads to a local increase in temperature by a hot spot effect. A theoretical model is presented, which describes the temperature conditions around the hot spot. The model predicts that the life time of the hot spot is much too short to generate g-laths observed with a length of 1–10 µm.

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Language(s): eng - English
 Dates: 2010-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.intermet.2010.01.017
 Degree: -

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Title: Intermetallics
  Abbreviation : Intermetallics
Source Genre: Journal
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Publ. Info: Barking, Essex, England : Elsevier
Pages: - Volume / Issue: 18 (5) Sequence Number: - Start / End Page: 972 - 976 Identifier: ISSN: 0966-9795
CoNE: https://pure.mpg.de/cone/journals/resource/954925582175