High-resolution image simulation of overlap structures in TiAl alloy

C. L. Chen; W. Lu; Y. Y. Cui; L. L. He; H. Q. Ye

doi:10.1016/j.jallcom.2008.01.027

High-resolution image simulation of overlap structures in TiAl alloy

C. L. Chen, W. Lu, Y. Y. Cui, L. L. He, H. Q. Ye

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

11 Citations (Scopus)

Abstract

High-resolution electron microscopy (HREM) images of the overlap structures in TiAl have been studied by the comparisons of experimental techniques and theoretic simulations. Several misunderstandings about TiAl microstructures were corrected. First, studies revealed that the reported 9R structures in TiAl must result from the overlap of two twin-related γ laths. They were not the true 9R structure. Second, the fringes (FR) between the γ and α₂ phases have once been misconsidered as the stacking faults fringes which promoted the α₂ ↔ γ phase transformations. This work proved them to be the fringes caused by the overlap of the α₂ and γ phases. Through study of the imaging of the overlap structures, a new formation mechanism of the fringes has been proposed.

Original language	English
Pages (from-to)	179-186
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	468
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2008.01.027
Publication status	Published - 2009 Jan 22

Keywords

Crystal structural and symmetry
Intermetallics
Scanning and transmission electron microscopy

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2008.01.027

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title = "High-resolution image simulation of overlap structures in TiAl alloy",

abstract = "High-resolution electron microscopy (HREM) images of the overlap structures in TiAl have been studied by the comparisons of experimental techniques and theoretic simulations. Several misunderstandings about TiAl microstructures were corrected. First, studies revealed that the reported 9R structures in TiAl must result from the overlap of two twin-related γ laths. They were not the true 9R structure. Second, the fringes (FR) between the γ and α2 phases have once been misconsidered as the stacking faults fringes which promoted the α2 ↔ γ phase transformations. This work proved them to be the fringes caused by the overlap of the α2 and γ phases. Through study of the imaging of the overlap structures, a new formation mechanism of the fringes has been proposed.",

keywords = "Crystal structural and symmetry, Intermetallics, Scanning and transmission electron microscopy",

author = "Chen, {C. L.} and W. Lu and Cui, {Y. Y.} and He, {L. L.} and Ye, {H. Q.}",

note = "Funding Information: This research was carried out with the support of NSFC grant No. 50271073. The authors would like to express grateful acknowledgements. ",

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doi = "10.1016/j.jallcom.2008.01.027",

language = "English",

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journal = "Journal of Alloys and Compounds",

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publisher = "Elsevier BV",

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T1 - High-resolution image simulation of overlap structures in TiAl alloy

AU - Chen, C. L.

AU - Lu, W.

AU - Cui, Y. Y.

AU - He, L. L.

AU - Ye, H. Q.

N1 - Funding Information: This research was carried out with the support of NSFC grant No. 50271073. The authors would like to express grateful acknowledgements.

PY - 2009/1/22

Y1 - 2009/1/22

N2 - High-resolution electron microscopy (HREM) images of the overlap structures in TiAl have been studied by the comparisons of experimental techniques and theoretic simulations. Several misunderstandings about TiAl microstructures were corrected. First, studies revealed that the reported 9R structures in TiAl must result from the overlap of two twin-related γ laths. They were not the true 9R structure. Second, the fringes (FR) between the γ and α2 phases have once been misconsidered as the stacking faults fringes which promoted the α2 ↔ γ phase transformations. This work proved them to be the fringes caused by the overlap of the α2 and γ phases. Through study of the imaging of the overlap structures, a new formation mechanism of the fringes has been proposed.

AB - High-resolution electron microscopy (HREM) images of the overlap structures in TiAl have been studied by the comparisons of experimental techniques and theoretic simulations. Several misunderstandings about TiAl microstructures were corrected. First, studies revealed that the reported 9R structures in TiAl must result from the overlap of two twin-related γ laths. They were not the true 9R structure. Second, the fringes (FR) between the γ and α2 phases have once been misconsidered as the stacking faults fringes which promoted the α2 ↔ γ phase transformations. This work proved them to be the fringes caused by the overlap of the α2 and γ phases. Through study of the imaging of the overlap structures, a new formation mechanism of the fringes has been proposed.

KW - Crystal structural and symmetry

KW - Intermetallics

KW - Scanning and transmission electron microscopy

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DO - 10.1016/j.jallcom.2008.01.027

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

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ER -

High-resolution image simulation of overlap structures in TiAl alloy

Abstract

Keywords

ASJC Scopus subject areas

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