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Fine Structure in Multi-Phase Zr8Ni21-Zr7Ni10-Zr2Ni7 Alloy Revealed by Transmission Electron Microscope

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BASF-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
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Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2015, 8(7), 4618-4630; https://doi.org/10.3390/ma8074618
Received: 27 May 2015 / Revised: 6 July 2015 / Accepted: 16 July 2015 / Published: 22 July 2015
The microstructure of an annealed alloy with a Zr8Ni21 composition was studied by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The presence of three phases, Zr8Ni21, Zr2Ni7, and Zr7Ni10, was confirmed by SEM/X-ray energy dispersive spectroscopy compositional mapping and TEM electron diffraction. Distribution of the phases and their morphology can be linked to a multi-phase structure formed by a sequence of reactions: (1) L → Zr2Ni7 + L’; (2) peritectic Zr2Ni7 + L’ → Zr2Ni7 + Zr8Ni21 + L”; (3) eutectic L” → Zr8Ni21 + Zr7Ni10. The effect of annealing at 960 °C, which was intended to convert a cast structure into a single-phase Zr8Ni21 structure, was only moderate and the resulting alloy was still multi-phased. TEM and crystallographic analysis of the Zr2Ni7 phase show a high density of planar (001) defects that were explained as low-energy boundaries between rotational variants and stacking faults. The crystallographic features arise from the pseudo-hexagonal structure of Zr2Ni7. This highly defective Zr2Ni7 phase was identified as the source of the broad X-ray diffraction peaks at around 38.4° and 44.6° when a Cu-K was used as the radiation source. View Full-Text
Keywords: intermetallics; nanocrystalline structure; microstructure; planar faults; scanning electron microscopy; transmission electron microscopy intermetallics; nanocrystalline structure; microstructure; planar faults; scanning electron microscopy; transmission electron microscopy
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Shen, H.; Bendersky, L.A.; Young, K.; Nei, J. Fine Structure in Multi-Phase Zr8Ni21-Zr7Ni10-Zr2Ni7 Alloy Revealed by Transmission Electron Microscope. Materials 2015, 8, 4618-4630.

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