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An investigation of grain boundary sliding in superplasticity at high elongations

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Abstract

Experiments were performed on the superplastic Zn-22% Al eutectoid alloy to determine the contribution of grain boundary sliding at both low (35%) and high (∼235%) elongations. The tests were conducted at two different strain rates in the superplastic Region II, and the results show that, within the accuracy of the measurements, there is a large sliding contribution at both elongations. By taking detailed measurements of both the magnitude of the sliding offset and the type of interface, it is shown that the average offsets are generally a maximum at the Zn-Zn boundaries, there is less sliding at the Zn-Al interfaces, and the offsets are a minimum at the Al-Al boundaries. In addition, the distributions of the magnitudes of the sliding offsets are similar at both the low and high elongations. It is concluded that grain boundary sliding is an important deformation process in the superplastic Region II and that it remains important even when the elongation is very high. The nature of the results indicates also that experimental observations of the deformation behaviour in superplastic materials at low elongations (up to 50%) provide meaningful information on the behaviour at much higher (superplastic) elongations.

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Author notes

  1. Atul H. Chokshi

    Present address: Division of Materials Science and Engineering, Department of Mechanical Engineering, University of California, 95616, Davis, CA, USA

Authors and Affiliations

  1. Departments of Materials Science and Mechanical Engineering, University of Southern California, 90089-1453, Los Angeles, California, USA

    Zhao-Rong Lin, Atul H. Chokshi & Terence G. Langdon

Authors
  1. Zhao-Rong Lin
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  2. Atul H. Chokshi
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  3. Terence G. Langdon
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On leave from Mechanical Engineering Department, Nanjing Aeronautical Institute, Nanjing, Jiang-su 210002, People's Republic of China.

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Lin, ZR., Chokshi, A.H. & Langdon, T.G. An investigation of grain boundary sliding in superplasticity at high elongations. J Mater Sci 23, 2712–2722 (1988). https://doi.org/10.1007/BF00547441

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  • DOI: https://doi.org/10.1007/BF00547441

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