Toughness-strength relations in the overaged 7449 Al-Based alloy
Toughness-strength relations in the overaged 7449 Al-Based alloy
This article examines the relationship between plane strain fracture toughness, KIc, the tensile properties, and the microstructure of the overaged 7449 aluminum-plate alloy, and compares them to the 7150 alloy. The 7449 alloy has a higher content of ??/? precipitates; and, the 7150 alloy contains a greater amount of coarse intermetallic particles, as it contains an appreciable amount of coarse S phase (Al2CuMg), which is largely absent in the 7449 alloy. The toughness of the alloys shows an increase on overaging, and the 7449 alloy shows a reasonably linear toughness—yield strength relation on extended overaging. Several mechanisms of failure occur: coarse voiding at intermetallics and a combined intergranular/transgranular shear fracture mode, with the former becoming more important as overaging progresses. Drawbacks of existing models for toughness are discussed, and a new model for plane strain fracture toughness, based on the microstructurally dependent work-hardening factor, KA, introduced in Ashby's theory of work hardening, is developed. This model predicts a linear relation between KIc and K0.85A/?0.35ys, where ?ys is the yield strength, which is consistent with the experimental data.
1125-1136
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
1 April 2002
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Kamp, N., Sinclair, I. and Starink, M.J.
(2002)
Toughness-strength relations in the overaged 7449 Al-Based alloy.
Metallurgical and Materials Transactions A, 33 (4), .
(doi:10.1007/s11661-002-0214-2).
Abstract
This article examines the relationship between plane strain fracture toughness, KIc, the tensile properties, and the microstructure of the overaged 7449 aluminum-plate alloy, and compares them to the 7150 alloy. The 7449 alloy has a higher content of ??/? precipitates; and, the 7150 alloy contains a greater amount of coarse intermetallic particles, as it contains an appreciable amount of coarse S phase (Al2CuMg), which is largely absent in the 7449 alloy. The toughness of the alloys shows an increase on overaging, and the 7449 alloy shows a reasonably linear toughness—yield strength relation on extended overaging. Several mechanisms of failure occur: coarse voiding at intermetallics and a combined intergranular/transgranular shear fracture mode, with the former becoming more important as overaging progresses. Drawbacks of existing models for toughness are discussed, and a new model for plane strain fracture toughness, based on the microstructurally dependent work-hardening factor, KA, introduced in Ashby's theory of work hardening, is developed. This model predicts a linear relation between KIc and K0.85A/?0.35ys, where ?ys is the yield strength, which is consistent with the experimental data.
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Kamp_Met_Mater_Trans_2002.pdf
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Published date: 1 April 2002
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 21984
URI: http://eprints.soton.ac.uk/id/eprint/21984
ISSN: 1073-5623
PURE UUID: fe1658e3-5c3c-4426-88c9-88724c8ba3f0
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Date deposited: 16 Mar 2006
Last modified: 15 Mar 2024 06:33
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N. Kamp
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