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Precipitation strengthening and thermally activated plastic flow in polycrystalline Al−Zn alloys

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Abstract

The influence of G. P. zone size and volume fraction on the yield strength of polycrystalline Al−Zn alloys has been determined. The data obtained at 77°K plot linearly against both R1/3 f 2/3 and R1/2 f 1/2, but the slope of the latter plot corresponds most closely to the value expected if coherency strains between the G. P. zones and the matrix are determinant. The data also show that precipitation occurs in the early stages of aging. Yield stess studies as a function of temperature for fully aged specimens indicate thatUc, the energy of thermally activated flow, is about 0.5 ev, nearly identical with the value obtained for unalloyed aluminum. This may indicate that thermally activated cutting of G. P. zones does not occur in these alloys.

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Authors and Affiliations

  1. Metallurgy Research, Metallurgy and Ceramics Research Laboratory, Aerospace Research Laboratories Air Force Systems Command, Wright-Patterson Air Force Base, Ohio

    Harry A. Lipsitt

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  1. Harry A. Lipsitt
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Lipsitt, H.A. Precipitation strengthening and thermally activated plastic flow in polycrystalline Al−Zn alloys. Metall Trans 2, 1739–1744 (1971). https://doi.org/10.1007/BF02913900

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