In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy

Klaus Dieter Liss; Arno Bartels; Helmut Clemens; Andreas Stark; Thomas Buslaps; Dominic Phelan; La Reine A. Yeoh

In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy

Klaus Dieter Liss^*, Arno Bartels, Helmut Clemens, Andreas Stark, Thomas Buslaps, Dominic Phelan, La Reine A. Yeoh

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

4 Scopus citations

Abstract

Phase diagrams and microstructures of titanium aluminides are rather complex and, so far, tittle data were observed in-situ at elevated temperatures. We report on two-dimensional high energy X-ray diffraction and complementary laser scanning confocal microscopy to characterize the appearing phases and to follow the phase evolution in-situ and in real time. As an example, the microstructure evolution of a quenched γ-TiAl alloy, consisting of α₂-Ti₃Al grains at room temperature, has been followed in both reciprocal and direct space as a function of temperature up to 1400°C. At 700 - 800°C extremely fine γ-laths are formed in α₂-grains occurring through an oriented rearrangement of atoms. Streaks linking reflections of both phases testify from coherent lattice and orientation gradients in the transforming crystallite. At temperatures around the eutectoid temperature recrystallization effects and the γ→α phase transition take place leading to grain refinement.

Original language	English
Title of host publication	Structural Aluminides for Elevated Temperatures
Subtitle of host publication	Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.
Pages	137-144
Number of pages	8
State	Published - 2008
Externally published	Yes
Event	Structural Aluminides for Elevated Temperatures Symposium, TMS 2008 Annual Meeting and Exhibition - New Orleans, LA, United States Duration: 9 Mar 2008 → 13 Mar 2008

Publication series

Name	TMS Annual Meeting

Conference

Conference	Structural Aluminides for Elevated Temperatures Symposium, TMS 2008 Annual Meeting and Exhibition
Country/Territory	United States
City	New Orleans, LA
Period	9/03/08 → 13/03/08

Keywords

High-energy X-rays
In-situ
Laser scanning microscopy
Phase transformation
Real-time
Synchrotron radiation
Titanium aluminide

Cite this

Liss, K. D., Bartels, A., Clemens, H., Stark, A., Buslaps, T., Phelan, D., & Yeoh, L. R. A. (2008). In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy. In Structural Aluminides for Elevated Temperatures: Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib. (pp. 137-144). (TMS Annual Meeting).

Liss, Klaus Dieter ; Bartels, Arno ; Clemens, Helmut et al. / In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy. Structural Aluminides for Elevated Temperatures: Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.. 2008. pp. 137-144 (TMS Annual Meeting).

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title = "In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy",

abstract = "Phase diagrams and microstructures of titanium aluminides are rather complex and, so far, tittle data were observed in-situ at elevated temperatures. We report on two-dimensional high energy X-ray diffraction and complementary laser scanning confocal microscopy to characterize the appearing phases and to follow the phase evolution in-situ and in real time. As an example, the microstructure evolution of a quenched γ-TiAl alloy, consisting of α2-Ti3Al grains at room temperature, has been followed in both reciprocal and direct space as a function of temperature up to 1400°C. At 700 - 800°C extremely fine γ-laths are formed in α2-grains occurring through an oriented rearrangement of atoms. Streaks linking reflections of both phases testify from coherent lattice and orientation gradients in the transforming crystallite. At temperatures around the eutectoid temperature recrystallization effects and the γ→α phase transition take place leading to grain refinement.",

keywords = "High-energy X-rays, In-situ, Laser scanning microscopy, Phase transformation, Real-time, Synchrotron radiation, Titanium aluminide",

author = "Liss, {Klaus Dieter} and Arno Bartels and Helmut Clemens and Andreas Stark and Thomas Buslaps and Dominic Phelan and Yeoh, {La Reine A.}",

year = "2008",

language = "英语",

isbn = "9780873397209",

series = "TMS Annual Meeting",

pages = "137--144",

booktitle = "Structural Aluminides for Elevated Temperatures",

note = "null ; Conference date: 09-03-2008 Through 13-03-2008",

}

Liss, KD, Bartels, A, Clemens, H, Stark, A, Buslaps, T, Phelan, D & Yeoh, LRA 2008, In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy. in Structural Aluminides for Elevated Temperatures: Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.. TMS Annual Meeting, pp. 137-144, Structural Aluminides for Elevated Temperatures Symposium, TMS 2008 Annual Meeting and Exhibition, New Orleans, LA, United States, 9/03/08.

In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy. / Liss, Klaus Dieter; Bartels, Arno; Clemens, Helmut et al.

Structural Aluminides for Elevated Temperatures: Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.. 2008. p. 137-144 (TMS Annual Meeting).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy

AU - Liss, Klaus Dieter

AU - Bartels, Arno

AU - Clemens, Helmut

AU - Stark, Andreas

AU - Buslaps, Thomas

AU - Phelan, Dominic

AU - Yeoh, La Reine A.

PY - 2008

Y1 - 2008

N2 - Phase diagrams and microstructures of titanium aluminides are rather complex and, so far, tittle data were observed in-situ at elevated temperatures. We report on two-dimensional high energy X-ray diffraction and complementary laser scanning confocal microscopy to characterize the appearing phases and to follow the phase evolution in-situ and in real time. As an example, the microstructure evolution of a quenched γ-TiAl alloy, consisting of α2-Ti3Al grains at room temperature, has been followed in both reciprocal and direct space as a function of temperature up to 1400°C. At 700 - 800°C extremely fine γ-laths are formed in α2-grains occurring through an oriented rearrangement of atoms. Streaks linking reflections of both phases testify from coherent lattice and orientation gradients in the transforming crystallite. At temperatures around the eutectoid temperature recrystallization effects and the γ→α phase transition take place leading to grain refinement.

AB - Phase diagrams and microstructures of titanium aluminides are rather complex and, so far, tittle data were observed in-situ at elevated temperatures. We report on two-dimensional high energy X-ray diffraction and complementary laser scanning confocal microscopy to characterize the appearing phases and to follow the phase evolution in-situ and in real time. As an example, the microstructure evolution of a quenched γ-TiAl alloy, consisting of α2-Ti3Al grains at room temperature, has been followed in both reciprocal and direct space as a function of temperature up to 1400°C. At 700 - 800°C extremely fine γ-laths are formed in α2-grains occurring through an oriented rearrangement of atoms. Streaks linking reflections of both phases testify from coherent lattice and orientation gradients in the transforming crystallite. At temperatures around the eutectoid temperature recrystallization effects and the γ→α phase transition take place leading to grain refinement.

KW - High-energy X-rays

KW - In-situ

KW - Laser scanning microscopy

KW - Phase transformation

KW - Real-time

KW - Synchrotron radiation

KW - Titanium aluminide

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T3 - TMS Annual Meeting

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EP - 144

BT - Structural Aluminides for Elevated Temperatures

Y2 - 9 March 2008 through 13 March 2008

ER -

Liss KD, Bartels A, Clemens H, Stark A, Buslaps T, Phelan D et al. In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy. In Structural Aluminides for Elevated Temperatures: Gamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.. 2008. p. 137-144. (TMS Annual Meeting).

In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy

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Publication series

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Keywords

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