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

Saurabh Kabra; Kun Yan; Svea Mayer; Thomas Schmoelzer; Mark Reid; Rian Dippenaar; Helmut Clemens; Klaus Dieter Liss

doi:10.3139/146.110528

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

Saurabh Kabra, Kun Yan, Svea Mayer, Thomas Schmoelzer, Mark Reid, Rian Dippenaar, Helmut Clemens, Klaus Dieter Liss^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

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, a and β, 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.

Original language	English
Pages (from-to)	697-702
Number of pages	6
Journal	International Journal of Materials Research
Volume	102
Issue number	6
DOIs	https://doi.org/10.3139/146.110528
State	Published - 2011
Externally published	Yes

Keywords

In-situ experiment
Neutron and synchrotron radiation
Phase diagram
Phase transformation
TiAl alloys

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title = "Phase transition and ordering behavior of ternary Ti-Al-Mo alloys using in-situ neutron diffraction",

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, a and β, 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 = "In-situ experiment, Neutron and synchrotron radiation, Phase diagram, Phase transformation, TiAl alloys",

author = "Saurabh Kabra and Kun Yan and Svea Mayer and Thomas Schmoelzer and Mark Reid and Rian Dippenaar and Helmut Clemens and Liss, {Klaus Dieter}",

year = "2011",

doi = "10.3139/146.110528",

language = "英语",

volume = "102",

pages = "697--702",

journal = "International Journal of Materials Research",

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AU - Kabra, Saurabh

AU - Yan, Kun

AU - Mayer, Svea

AU - Schmoelzer, Thomas

AU - Reid, Mark

AU - Dippenaar, Rian

AU - Clemens, Helmut

AU - Liss, Klaus Dieter

PY - 2011

Y1 - 2011

N2 - 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, a and β, 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.

AB - 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, a and β, 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.

KW - In-situ experiment

KW - Neutron and synchrotron radiation

KW - Phase diagram

KW - Phase transformation

KW - TiAl alloys

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DO - 10.3139/146.110528

M3 - 文章

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VL - 102

SP - 697

EP - 702

JO - International Journal of Materials Research

JF - International Journal of Materials Research

SN - 1862-5282

IS - 6

ER -

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

Abstract

Keywords

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