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Spontaneous deformation during aging under stress in a copper-beryllium alloy

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Abstract

An anomalous phenomenon has been found in a Cu-Be alloy during an investigation of the aging behavior. A platelike testpiece of a cold-rolled Cu-Be alloy (Japanese Industrial Standard No. C1720) was held at 1073 K for 2 hours, followed by quenching to solutionize. The testpiece was set in a hand-made cantilever jig and aged by applying an external stress with a screw at the free end of the cantilever. The free end of the cantilever leaves the screw in 30 minutes and warps further, within 1 hour, during aging. The spontaneous warping deflection is closely related to the hardness change through aging and is dependent upon the elastic strain introduced initially by the external load. Transmission electron microscope (TEM) observation makes clear that matastable γ′ precipitates, which bring about the most effective hardening and shrinkage, are predominant at the compression side of the cantilever, while extremely fine Guinier—Preston (G—P) zones are observed at an early stage of aging and coarse γ-phase precipitates are observed at a prolonged aging time in the tension side. The spontaneous warping results from the difference of the precipitation sequence between the two sides.

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Author notes

  1. K. Naito (Graduate Student)

    Present address: the Department of Materials Science and Engineering, Kyushu Institute of Technology, 804-0015, Kitakyushu, Japan

Authors and Affiliations

  1. the Department of Materials Science and Engineering, Kyushu Institute of Technology, 804-0015, Kitakyushu, Japan

    H. Era (Associate Professor) & K. Kishitake (Professor)

  2. Nippon Gaishi Co. Ltd., 475-0825, Handa, Aichi, Japan

    K. Naito (Graduate Student)

Authors
  1. H. Era
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  2. K. Kishitake
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  3. K. Naito
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Era, H., Kishitake, K. & Naito, K. Spontaneous deformation during aging under stress in a copper-beryllium alloy. Metall Mater Trans A 31, 2765–2771 (2000). https://doi.org/10.1007/BF02830336

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  • DOI: https://doi.org/10.1007/BF02830336

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