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Some observations on the tertiary stage of creep of high purity aluminum

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Abstract

A study has been made of the structural changes in polycrystalline high purity aluminum during the tertiary stage of creep under conditions of constant tensile load. It appears that there is no basic modification in the particular mechanism of deformation that characterized the preceding secondary stage of creep, but that the changes in crystalline structure produced during the tertiary stage are only a consequence and not a cause of the accelerated strain. Intercrystalline fissures were observed on entry into the tertiary stage, and these might supplement the accelerated rate of strain owing to local stress concentrations. There is evidence that the formation of these fissures may be associated with the presence of surface imperfections, and it is suggested that a more generalized treatment of the results may explain certain creep characteristics of commercial alloys.

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Authors and Affiliations

  1. Commonwealth of Australia Defense Standards Laboratories, Melbourne, Australia

    G. R. Wilms

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  1. G. R. Wilms
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Additional information

Discussion on this paper, TP 3837E, may be sent, 2 copies, to AIME by Jan. 1, 1955. Manuscript, Nov. 19, 1952.

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Wilms, G.R. Some observations on the tertiary stage of creep of high purity aluminum. JOM 6, 1291–1296 (1954). https://doi.org/10.1007/BF03398372

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  • DOI: https://doi.org/10.1007/BF03398372

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