MATERIAL - ALUMINUM - 7178-T6 EFFECT OF INTERRUPTED AGING TREATMENTS ON MECHANICAL PROPERTIES

Abstract

Bare 0.064-in. thick 7178-0 sheet, clad 0.064-in. thick 7178-T6 sheet, and 0.125-in. thick 1-1/4in. by 1-1/4-in. extruded 7178-0 angle was solution heat treated at 870 F for 30, or 40 min., quenched in cold water and aged with a variety of interrupted aging treatments which consisted of two steps; an initial nucleation treatment and a final growth treatment. The nucleation treatments used were 212 F for 4 hrs. and 230 F for 3 hrs. The growth treatments used with the nucleation treatments included 325 F for 1 to 5 hrs. Most of the aging treatments produced excellent yield strengths, but ultimate strength and elongation losses were experienced in varying degree, although in all cases military specification minima were exceeded. The aging treatment consisting of 250 F for 3 hrs. plus 300 F for 4 hrs. produced the best and most consistent mechanical properties among those observed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 29, 1957
Accession Number
AD0407594

Entities

People

  • H. C. Turner
  • W. M. Sutherland

Organizations

  • General Dynamics

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Cold Water
  • Contracts
  • Corporations
  • Government Procurement
  • Governments
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Solution Heat Treatment
  • Specifications
  • Standards
  • Tensile Properties
  • Yield Strength

Readers

  • Metallurgy
  • Thin Film Deposition Science.