In-situ TEM heating study of the γ lamellae formation inside the α2 matrix of a Ti-45Al-7.5Nb alloy

Limei Cha*, Helmut Clemens, Gerhard Dehm, Zaoli Zhang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

In-situ heating transmission electron microscopy (TEM) was employed to investigate the initial stage of lamellae formation in a high Nb containing γ-TiAl based alloy. A Ti-45Al-7.5Nb alloy (at %), which was heat treated and quenched in a non-equilibrium state such that the matrix consists of ordered α2 grains, was annealed inside a TEM up to 750 °C. The in-situ TEM study reveals that γ laths precipitate in the α2 matrix at ∼750 °C possessing the classical Blackburn orientation relationship, i.e. (0001)α2 // (111)γ and [11-20]α2 // <110]γ. The microstructure of the in-situ TEM experiment is compared to results from ex-situ heating and subsequent TEM studies.

Original languageEnglish
Title of host publicationAdvances in Superalloys
Pages1365-1368
Number of pages4
DOIs
StatePublished - 2011
Externally publishedYes
Event2010 International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2010 - Shenzhen, China
Duration: 6 Nov 20108 Nov 2010

Publication series

NameAdvanced Materials Research
Volume146-147
ISSN (Print)1022-6680

Conference

Conference2010 International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2010
CountryChina
CityShenzhen
Period6/11/108/11/10

Keywords

  • In-situ heating
  • Lamellar structure
  • TEM
  • TiAl alloys

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