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The effect of processing conditions and subsequent heat treatment on the transformation behavior of some rapidly solidified copper-base shape memory alloys

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Abstract

A number of copper-base alloys (Cu-Al, Cu-Al-Ni) have been processed by chill block melt spinning and planar flow casting. A range of processing conditions was employed to observe how these affected the subsequent transformation behavior of these alloys. Characteristic transformation temperatures were analyzed in a differential scanning calorimeter and structures examined by both scanning and transmission electron microscopy. The high transformation temperatures of Cu-Al alloys made them unsuitable for monitoring the effect of process conditions. Cu-Al-Ni alloys withM s temperatures around room temperature are sensitive to both wheel material and provision of secondary quenching facilities. Some alloys containing titanium did not exhibit a shape memory phenomenon after rapid quenching. Heat treatment of alloys in the β and β1 phase fields was undertaken. β phase annealing resulted in grain growth and an increase inM s , while in the β1 phase, stabilization of transformation temperatures could be obtained below 300 °C. The effect of low stresses was also monitored in a thermo-mechanical analyzer (TMA).

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Authors and Affiliations

  1. Materials Science, Faculty of Technology, The Open University, MK7 6AA, Walton Hall, Milton Keynes, United Kingdom

    J. V. Wood (Lecturer)

  2. Department of Metal Science and Technology, Kyoto University, Kyoto, Japan

    P. H. Shingu (Professor)

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  1. J. V. Wood
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  2. P. H. Shingu
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Wood, J.V., Shingu, P.H. The effect of processing conditions and subsequent heat treatment on the transformation behavior of some rapidly solidified copper-base shape memory alloys. Metall Trans A 15, 471–480 (1984). https://doi.org/10.1007/BF02644970

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