X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090

J. D. Haase; A. Guvenilir; J. R. Witt; S. R. Stock

doi:10.1016/S1359-6454(98)00118-9

X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090

J. D. Haase, A. Guvenilir, J. R. Witt, S. R. Stock^*

^*Corresponding author for this work

Cell & Developmental Biology

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

19 Scopus citations

Abstract

In certain orientations, Al-Li 2090 T8E41 cracks more slowly in fatigue than other aluminum alloys due to roughness-induced closure linked to the average texture or macrotexture. For this application, three-dimensional, non-destructive measurement of microtexture and strain evolution within samples was developed using synchrotron polychromatic X-ray microbeam diffraction; its use in mapping the microtexture of fatigue crack asperities in Al-Li 2090 are reported. Groups of adjacent grains with nearly identical orientations were found at numerous locations in the plate centers, and this type of "mesotexture" appeared closely tied to asperity formation. Changing arrangements of 111 diffraction spots relative to the samples' rolling and crack propagation directions are found to correspond to the transitions between a relatively planar section of the crack and an adjacent asperity.

Original language	English (US)
Pages (from-to)	4791-4799
Number of pages	9
Journal	Acta Materialia
Volume	46
Issue number	13
DOIs	https://doi.org/10.1016/S1359-6454(98)00118-9
State	Published - Aug 10 1998

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(98)00118-9

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@article{efc86a2a89cb4d428fb373b181548598,

title = "X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090",

abstract = "In certain orientations, Al-Li 2090 T8E41 cracks more slowly in fatigue than other aluminum alloys due to roughness-induced closure linked to the average texture or macrotexture. For this application, three-dimensional, non-destructive measurement of microtexture and strain evolution within samples was developed using synchrotron polychromatic X-ray microbeam diffraction; its use in mapping the microtexture of fatigue crack asperities in Al-Li 2090 are reported. Groups of adjacent grains with nearly identical orientations were found at numerous locations in the plate centers, and this type of {"}mesotexture{"} appeared closely tied to asperity formation. Changing arrangements of 111 diffraction spots relative to the samples' rolling and crack propagation directions are found to correspond to the transitions between a relatively planar section of the crack and an adjacent asperity.",

author = "Haase, {J. D.} and A. Guvenilir and Witt, {J. R.} and Stock, {S. R.}",

note = "Funding Information: The support of the Office of Naval Research and the encouragement of George Yoder, Office of Naval Research, are gratefully acknowledged. Experiments were preformed at SSRL, which is operated by the Department of Energy, Office of Basic Energy Sciences. Zofia Rek of SSRL is also thanked for her invaluable assistance with the microbeam experiments and R. Brown for his help with fatigue crack propagation. The authors would also like to acknowledge S. Spragg and T. Watt for their help in outputting the multitude of diffraction patterns. ",

year = "1998",

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doi = "10.1016/S1359-6454(98)00118-9",

language = "English (US)",

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T1 - X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090

AU - Haase, J. D.

AU - Guvenilir, A.

AU - Witt, J. R.

AU - Stock, S. R.

N1 - Funding Information: The support of the Office of Naval Research and the encouragement of George Yoder, Office of Naval Research, are gratefully acknowledged. Experiments were preformed at SSRL, which is operated by the Department of Energy, Office of Basic Energy Sciences. Zofia Rek of SSRL is also thanked for her invaluable assistance with the microbeam experiments and R. Brown for his help with fatigue crack propagation. The authors would also like to acknowledge S. Spragg and T. Watt for their help in outputting the multitude of diffraction patterns.

PY - 1998/8/10

Y1 - 1998/8/10

N2 - In certain orientations, Al-Li 2090 T8E41 cracks more slowly in fatigue than other aluminum alloys due to roughness-induced closure linked to the average texture or macrotexture. For this application, three-dimensional, non-destructive measurement of microtexture and strain evolution within samples was developed using synchrotron polychromatic X-ray microbeam diffraction; its use in mapping the microtexture of fatigue crack asperities in Al-Li 2090 are reported. Groups of adjacent grains with nearly identical orientations were found at numerous locations in the plate centers, and this type of "mesotexture" appeared closely tied to asperity formation. Changing arrangements of 111 diffraction spots relative to the samples' rolling and crack propagation directions are found to correspond to the transitions between a relatively planar section of the crack and an adjacent asperity.

AB - In certain orientations, Al-Li 2090 T8E41 cracks more slowly in fatigue than other aluminum alloys due to roughness-induced closure linked to the average texture or macrotexture. For this application, three-dimensional, non-destructive measurement of microtexture and strain evolution within samples was developed using synchrotron polychromatic X-ray microbeam diffraction; its use in mapping the microtexture of fatigue crack asperities in Al-Li 2090 are reported. Groups of adjacent grains with nearly identical orientations were found at numerous locations in the plate centers, and this type of "mesotexture" appeared closely tied to asperity formation. Changing arrangements of 111 diffraction spots relative to the samples' rolling and crack propagation directions are found to correspond to the transitions between a relatively planar section of the crack and an adjacent asperity.

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X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090

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