Accession Number:

AD0425084

Title:

EFFECT OF TEMPERATURE ON DELAYED FRACTURE OF ALUMINUM ALLOY 2024 IN THE PRESENCE OF LIQUID ZINC AMALGAM,

Descriptive Note:

Corporate Author:

FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s):

Report Date:

1963-09-01

Pagination or Media Count:

18.0

Abstract:

Delayed fracture studies were conducted on aluminum alloy 2024 over a temperature range of 35 to 90 F. The alloy was solution treated at 920 F for one hour, cold water quenched, and then artificially aged at 375 F for four hours. Specimens were heated to desired temperatures in a liquid test bath. The specimens were then stressed to selected levels and were wetted using a liquid 2 zinc amalgam. Times to failure at different temperature levels were then determined. Test results showed that there was no significant variationin delayed fracture behavior within the range of 35 to 190 F. This fact indicates that mechanisms basic to the delayed fracture process, for this alloy and heat treatment, are essentially independent of temperature within this temperature range. Changes in the appearance of fractured edges for wetted specimens tested at different temperatures, however, suggests that mode of crack propagation possibly is temperature related. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE