Paper Title:
Soft Surface Layer of Age-Hardened Al-Zn Alloys and Its Effect on the Fatigue Strength
  Abstract

The surface layer of binary Al-Zn alloy specimen, ever after a long time aging, remains softer than the interior when the specimens are age-hardened at around room temperature after quenching from high temperature. In this study, effects of the soft surface layer on the fatigue strength of Al-Zn alloys were studied under repeated tensile loading. Vickers microharhness test revealed that there existed less hardened region in the vicinity of grain boundary and specimens surface, and that the region extends 50 to 100μm from the surface inward. From the plot of the stress amplitude against the number of cycles to failure, it is concluded that the presence of less hardened surface layer increases fatigue resistance of age-hardened Al-Zn alloys containing 8 to 16 mass%Zn under the repeated tensile loading.

  Info
Periodical
Key Engineering Materials (Volumes 345-346)
Edited by
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
Pages
391-394
DOI
10.4028/www.scientific.net/KEM.345-346.391
Citation
T. Kanadani, K. Nakagawa, N. Hosokawa, "Soft Surface Layer of Age-Hardened Al-Zn Alloys and Its Effect on the Fatigue Strength", Key Engineering Materials, Vols. 345-346, pp. 391-394, 2007
Online since
August 2007
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$32.00
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