TEST AND EXPLORATORY DEVELOPMENT OF AN OPTIMUM ALUMINUM ALLOY SYSTEM FOR SHIP STRUCTURES

Evaluation of plate fabricated in the laboratory from a series of Al-Mg alloys having magnesium contents of 7.0 to 9.5% showed an alloy designated as CS19 met the contract requirement of an as-welded yield strength of 30 ksi minimum. Fracture toughness and resistance to general corrosion, to exfoliation and to initiation of stress-corrosion cracks were at least equivalent to present 5456-H116 or H117 alloys. MIG weldments of CS19 plate produced with CS19 electrode and by a practice which provides interpass cooling to 250F were highly resistant to stress-corrosion cracking even after thermal treatment at 212F to simulate metallurgical changes taking place during long periods of service. Nominal composition of CS19 is Al-8.25 Mg-0.4 Mn-0.1 Cr with 0.12 max. Fe and 0.10 max. Si. (Modified author abstract)

• Corporate Authors:

  Aluminum Company of America

  Physical Metallurgy Division
  Alcoa Center, PA  United States 

  Naval Ship Systems Command

  Scientific Documentation Division
  Washington, DC  United States 
• Authors:
  • Rogers, RWJ
  • Vernam, W D
  • Shumaker, M B
• Publication Date: 1974-7-23

Media Info

• Pagination: 78 p.

Subject/Index Terms

• TRT Terms: Aluminum alloys; Corrosion resistant alloys; Fracture mechanics; Metal heating; Stress corrosion; Stress cracking; Stresses
• Uncontrolled Terms: Heat treatment
• Old TRIS Terms: Corrosion cracking
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00084822
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 56-AC223 Final Rpt.
• Contract Numbers: N00024-72-C-5571
• Files: TRIS
• Created Date: May 19 1975 12:00AM