Accession Number:

ADB019780

Title:

Aluminum Alloy 7050 Extrusions.

Descriptive Note:

Final rept. Mar 1973-Jun 1976

Corporate Author:

ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS

Personal Author(s):

• Staley, J. T.
• Jacoby, J. E.
• Davies, R. E.
• Nordmark, G. E.
• Walsh, J. D.

Report Date:

1977-03-01

Pagination or Media Count:

370.0

Abstract:

Practices for casting 25 and 35-inch diameter alloy 7050 ingot were developed effects of fabricating variables on mechanical properties and corrosion characteristics were evaluated, and aging conditions were established to produce two tempers, T7651X and T7351X, having two combinations of strength, stress-corrosion characteristics, and toughness. Twenty extruded shapes were subsequently fabricated to provide material for determination of design mechanical properties, modulus of elasticity, stress-strain curves, fracture toughness KIc, fatigue strengths, fatigue crack propagation rates, and stress- corrosion and corrosion characteristics. The alloy 7050 extrusions developed combinations of properties desired by the airframe industry that were superior to those of extrusions of commercially established aluminum alloys.

Descriptors:

• *AIRFRAMES
• *EXTRUSION
• CASTING
• CRACK PROPAGATION
• FABRICATION
• STRESS CORROSION

Subject Categories:

• Aircraft
• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE