Accession Number:

ADA059165

Title:

Effect of Ageing on the Hardness and Tensile Properties of Aluminum Alloy 7001 with Special Reference to the Influence of Delay Time between the Quenching and Ageing Treatments

Descriptive Note:

Technical note

Corporate Author:

MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)

Personal Author(s):

Report Date:

1978-03-01

Pagination or Media Count:

22.0

Abstract:

The change in hardness of aluminum alloy 7001 with time at temperatures 22 C, 50 C and 121 C following quenching from solution heat treatment at 460 C has been determined. At 22 C, natural ageing caused a hardness increase from 104 HV to 191 HV in 6 12 years and the hardness was still rising. Ageing at 50 C caused an increase in hardness from 104 HV to 179 HV in 96 h and the hardness was still rising. After approximately 72 h at 121 C a peak hardness of 216 HV was reached. Subsequent heating at 121 C after various periods of time up to 4 years at 22 C and 96 h at 50 C caused an initial reversion in hardness. Delay times varying from zero to 217 days at 22 C between quenching and ageing at 121 C for 24 h did not appear to have any significant effect on the hardness and tensile properties. Author

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE