Variations of mechanical properties, toughness and texture in two differently fabricated high strength aluminum alloy plates (7179-T651)
✍ Scribed by R.E. Zinkham; C. Baker
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 984 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Two 7179-T65 1 aluminum ahoy plates produced by hot rolling to finished size (one with a preforging reduction prior to rolling and one without preforging) were tested to obtain mechanical Properties in the longitudinal, long transverse and short transverse directions as a function of the @stance from the surface of the plate. Comparisons are made between plane strain fracture toughness WI,) values and yield stress, ultimate tensile stress, and elongation at the same distance from the surface. A compliance cahbration was performed on the small modified Sullivan single edge notched specimen used and the specimen dimensions were varied to establish the validity of the specimen for K,, determination.
Short transverse K,, fracture toughness values were approximately 50 per cent of those in the longitudinal direction while the long transverse results were intermediate. The relationship between strength and ductility was normal, but some anomalous trends did occur in the relationship between strength and fracture toughness which could possibly be related to variations in the amount of preferred orientation through the thickness of the plate. The intensity of X-ray diffraction from (110) planes parallel to the rolling plane was determined every 4 in. through the thickness of the plate, corresponding to the center line of each of the specimens tested in the longitudinal direction. A similar trend between fracture toughness and the amount of preferred orientation was found.