FRACTURE MECHANICS AND ACOUSTIC EMISSION RESPONSE OF RETROGRESSION-REAGED 7075-T6 ALUMINUM ALLOY

Authors
  1. McRae, K.I.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Stress corrosion cracking of high strength, structural aluminum alloys, such as 7075 in the T6 temper, is a commonly encountered problem. Recently, an alternative heat treatment, known as retrogression and reaging, has been proposed. In order to fully characterize this heat treatment, the plan strain fracture toughness, KIC, and the resistance to fatigue crack growth were compared to those of the same alloy in the normal T6 condition. Small increases in each of these mechanical properties were detected. The acoustic emission (AE) response to crack growth during testing was also investigated. It was determined that the number of AE signals is proportional to the crack length or total crack area. The response is consistent with proposed mechanisms for acoustic emission in the material. It is further noted that no significant difference exists in the AE response of 7075-T6 in the normal and retrogression-reaged conditions.
Report Number
MAT-R-82-C —
Date of publication
15 Jul 1982
Number of Pages
15
DSTKIM No
83-02840
CANDIS No
40520
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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