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Loading Mode and Environment Effects on Surface Profile Characteristics of Martensite Plates in Cu-Based SMAs

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Abstract

The present work reports the influence of the loading mode provided during training under constant stress, in bending, applied to lamellar specimens of Cu-Zn-Al shape memory alloys (SMAs). During training, the specimens were bent by a load fastened at their free end, while being martensitic at room temperature and they lifted the load by one-way effect (1WE), during heating up to austenitic field. On cooling to martensite field, the lower concave surface of bent specimens was compressed, and during heating it was elongated, being subjected to a series of tension-compression cycles, during heating-cooling, respectively. Conversely, the upper convex surface of bent specimens was elongated during cooling and compressed during heating, being subjected to compression-tension cycles. Furthermore, 2WE-trained actuators were tested by means of a hydraulic installation where, this time heating-cooling cycles were performed in oil conditions. Considering that the lower concave surface of the specimens was kept in compressed state, while the upper convex surface was kept in elongated state, the study reveals the influence of the two loading modes and environments on the width of martensite plates of the specimens trained under various numbers of cycles. In this purpose, Cu-Zn-Al specimens, trained under 100-300-500 cycles, were prepared and analyzed by atomic force microscopy (AFM) as well as optical and scanning electron microscopy (OM and SEM, respectively). The analysis also included AFM micrographs corroborated with statistical evaluations in order to reveal the effects of loading mode (tension or compression) in different environmental conditions of the specimens, on the surface profile characteristics of martensite plates, revealed by electropolishing.

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Acknowledgments

This research work was supported by the project PN.II-PT-PCCA-2011-3.1-0174, contract 144/ 2012.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, The “Gheorghe Asachi” Technical University of Iaşi, Bd. D. Mangeron 61A, 700050, Iasi, Romania

    Marius-Gabriel Suru, Adrian-Liviu Paraschiv, Nicoleta Monica Lohan, Bogdan Pricop & Leandru-Gheorghe Bujoreanu

  2. Particulate Materials Laboratory, Metallurgical and Materials Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey

    Burak Ozkal

Authors
  1. Marius-Gabriel Suru
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  2. Adrian-Liviu Paraschiv
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  3. Nicoleta Monica Lohan
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  4. Bogdan Pricop
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  5. Burak Ozkal
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  6. Leandru-Gheorghe Bujoreanu
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Correspondence to Leandru-Gheorghe Bujoreanu.

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Suru, MG., Paraschiv, AL., Lohan, N.M. et al. Loading Mode and Environment Effects on Surface Profile Characteristics of Martensite Plates in Cu-Based SMAs. J. of Materi Eng and Perform 23, 2669–2676 (2014). https://doi.org/10.1007/s11665-014-0951-6

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  • DOI: https://doi.org/10.1007/s11665-014-0951-6

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