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Journal of Materials Science

, Volume 42, Issue 10, pp 3661–3669 | Cite as

Temperature and dwell time effect on hardness of Al-base alloys

  • F. Abd El-Salam
  • L. A. Wahab
  • R. H. Nada
  • H. Y. Zahran
Article

Abstract

The hardness of Al–5wt%Zn (alloy A) and Al–5wt%Zn–0.25wt%In (alloy B) was measured at room temperature for samples heat treated in the range 300–453 K and dwell times in the range 30–300 s under 50 gm load. Softening was observed for all the samples and the hardness decreased with increasing temperature and/or dwell time. Hardness drop was larger for alloy (B), which in general showed higher hardness than alloy (A). The stress exponent n increased with increasing temperature and showed high values falling in the power law breakdown region. The parameters deduced from the analysis of X-rays data and micrographs were found to be consistant with the calculated mechanical data.

Keywords

Stress Exponent Dynamic Strain Aging Indentation Creep Guinier Preston Zone Impression Creep 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • F. Abd El-Salam
    • 1
  • L. A. Wahab
    • 2
  • R. H. Nada
    • 1
  • H. Y. Zahran
    • 1
  1. 1.Physics Department, Faculty of EducationAin Shams UniversityCairoEgypt
  2. 2.National Centre for Radiation Research and TechnologyNasr-City, CairoEgypt

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