ACOUSTIC EMISSION TESTING OF UNFLAWED 7075-T6 ALUMINUM

Tensile tests were performed to study the differences in the continuous acoustic emission from 7075-T6 aluminum plates made by five manufactures. 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 super-imposed 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% 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. Further-more, the dislocation mechanisms that cause the continuous acoustic emission in this aluminum alloy are altered by room temperature, diffusion-based aging.

• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Hamstad, M A
  • Mukherjee, A K
• Publication Date: 1975-5

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 167-172
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 3
  • Issue Number: 3
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Acoustic properties; Aluminum; Chemical composition; Deformation curve; Plate metal; Pollutants; Tension tests
• Uncontrolled Terms: Metal structure
• Old TRIS Terms: Tensile test
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00096263
• Record Type: Publication
• Report/Paper Numbers: Tech Note
• Files: TRIS
• Created Date: Jul 15 1975 12:00AM