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Modelling of fracture toughness in high strength 7xxx aluminium alloys

Modelling of fracture toughness in high strength 7xxx aluminium alloys
Modelling of fracture toughness in high strength 7xxx aluminium alloys
The relationship between plane strain fracture toughness, KIc, tensile properties and the microstructure of two high strength 7xxx alloys has been examined. Two formulations of the 7449 composition were examined, specifically, one containing Zr as the dispersoid forming element, whilst the other contained Mn. Fractography revealed coarse voiding at intermetallics, fine tensile voiding at dispersoids and a combined intergranular/transgranular shear fracture mode. In the Zr containing alloy in particular, the observed increase in toughness with overageing is accompanied by a change in fracture mode from predominantly intergranular/transgranular shear failure to coarse voiding. A new fracture toughness model has been derived based on the microstructurally dependent work hardening factor, KA, introduced in Ashby’s theory of work hardening. This model predicts a linear relationship between KIc and KA^0.85/?ys^0.35 which is shown to be consistent with the experimental data.
toughness, strength, 7xxx alloys, 7449
0878498990
396-402
1335-1340
Trans Tech
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gregson, P.J.
Harris, S.
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gregson, P.J.
Harris, S.

Kamp, N., Sinclair, I. and Starink, M.J. (2002) Modelling of fracture toughness in high strength 7xxx aluminium alloys. Gregson, P.J. and Harris, S. (eds.) In Aluminium Alloys 2002: Their Physical and Mechanical Properties. Trans Tech. pp. 1335-1340 .

Record type: Conference or Workshop Item (Paper)

Abstract

The relationship between plane strain fracture toughness, KIc, tensile properties and the microstructure of two high strength 7xxx alloys has been examined. Two formulations of the 7449 composition were examined, specifically, one containing Zr as the dispersoid forming element, whilst the other contained Mn. Fractography revealed coarse voiding at intermetallics, fine tensile voiding at dispersoids and a combined intergranular/transgranular shear fracture mode. In the Zr containing alloy in particular, the observed increase in toughness with overageing is accompanied by a change in fracture mode from predominantly intergranular/transgranular shear failure to coarse voiding. A new fracture toughness model has been derived based on the microstructurally dependent work hardening factor, KA, introduced in Ashby’s theory of work hardening. This model predicts a linear relationship between KIc and KA^0.85/?ys^0.35 which is shown to be consistent with the experimental data.

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More information

Published date: 2002
Venue - Dates: 8th International Conference ICAA8, 2002-07-02 - 2002-07-05
Keywords: toughness, strength, 7xxx alloys, 7449

Identifiers

Local EPrints ID: 22040
URI: http://eprints.soton.ac.uk/id/eprint/22040
ISBN: 0878498990
PURE UUID: 674aeb1d-5aa3-45bc-85d1-1699964bee15

Catalogue record

Date deposited: 20 Mar 2006
Last modified: 09 Apr 2019 16:31

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Contributors

Author: N. Kamp
Author: I. Sinclair
Author: M.J. Starink
Editor: P.J. Gregson
Editor: S. Harris

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