Acoustic emission testing of unflawed 7075-T6 aluminum

Journal Article · Thu May 01 04:00:00 EDT 1975 · J. Test. Eval.; (United States)

OSTI ID:7367007

Hamstad, M A; Mukherjee, A K

Tensile tests were performed to study the differences in the continuous acoustic emission from 7075-T6 aluminum plates made by five manufacturers. The grain structures and the chemical compositions of these plates were determined. Results are given on a sixth plate, which emitted burst-type acoustic emission superimposed on the continuous acoustic emission. The effect of orientation with respect to the rolling direction within a single plate was studied. Results from interrupted tensile tests are also reported; these tests were stopped at about 4.5 percent strain for different time periods before they were resumed. The tests indicate that acoustic emission is very sensitive to differences between plates of 7075-T6 aluminum that do not show up on a stress-strain curve. Furthermore, the dislocation mechanisms that cause the continuous acoustic emission in this aluminum alloy are altered by room temperature, diffusion-based aging. (auth)

• Research Organization: Univ. of California, Livermore
• OSTI ID: 7367007
• Journal Information: J. Test. Eval.; (United States), Journal Name: J. Test. Eval.; (United States) Vol. 3:3; ISSN JTEVA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
AGING
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
FABRICATION
LINE DEFECTS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
ORIENTATION
ROLLING
STRAINS
STRESSES
TENSILE PROPERTIES
TESTING
TIME DEPENDENCE