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Origins of stored enthalpy in cryomilled nanocrystalline Zn

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Abstract

Nanocrystalline Zn was prepared by cryomilling (mechanical attrition at liquid nitrogen temperature). Differential scanning calorimetry (DSC), x-ray diffraction, and transmission electron microscopy were used to study the structural changes and grain size distribution with milling time and subsequent annealing. Maxima in both stored enthalpy (for the low-temperature DSC peak) and lattice strain on the Zn basal planes were observed at the same milling time. Dislocation density on the basal planes is proposed as a major source for lattice strain and the measured stored enthalpy. The released enthalpy that might be due to grain growth is very small.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, North Carolina State University, 27695-7907, Raleigh, North Carolina, USA

    Xinghang Zhang, Haiyan Wang, Jagdish Narayan & Carl C. Koch

  2. Department of Mat. and Met., Engineering Faculty of Pet. & Mining Eng., Suez Canal University, Suez, Egypt

    Magdy Kassem

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  1. Xinghang Zhang
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  2. Haiyan Wang
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  3. Magdy Kassem
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  4. Jagdish Narayan
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  5. Carl C. Koch
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Correspondence to Carl C. Koch.

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Zhang, X., Wang, H., Kassem, M. et al. Origins of stored enthalpy in cryomilled nanocrystalline Zn. Journal of Materials Research 16, 3485–3495 (2001). https://doi.org/10.1557/JMR.2001.0479

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  • DOI: https://doi.org/10.1557/JMR.2001.0479

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