Nanoindentation study of bulk zirconium hydrides at elevated temperatures
The mechanical properties of zirconium hydrides were studied using nano-indentation technique between 25 and 400 °C. Temperature dependency of reduced elastic modulus and hardness of δ- and ε-zirconium hydrides were obtained by conducting nanoindentation experiments on bulk hydride samples with inde...
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Published in | Journal of alloys and compounds Vol. 726; no. C; pp. 41 - 48 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
05.12.2017
Elsevier BV Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The mechanical properties of zirconium hydrides were studied using nano-indentation technique between 25 and 400 °C. Temperature dependency of reduced elastic modulus and hardness of δ- and ε-zirconium hydrides were obtained by conducting nanoindentation experiments on bulk hydride samples with independently heating capability of indenter and heating stage. The reduced elastic modulus of δ-zirconium hydride (H/Zr ratio = 1.61) decreased from ∼113 GPa at room temperature to ∼109 GPa at 400 °C, while its hardness decreased significantly from 4.1 GPa to 2.41 GPa in the same temperature range. For ε-zirconium hydrides (H/Zr ratio = 1.79), the reduced elastic modulus decreased from 61 GPa at room temperature to 54 GPa at 300 °C, while its hardness from 3.06 GPa to 2.19 GPa.
•Reduced modulus of δ-hydride decreases from 113 GPa at 25 °C to 109 GPa at 400 °C.•Hardness of δ-hydride reduces from 4.1 GPa (25 °C) to 2.4 GPa (400 °C).•Significant reduction of δ-hydride hardness is likely related to yield behavior.•Reduced modulus of ε-hydride decreases from 61 GPa at 25 °C to 54 GPa at 300 °C.•Hardness of ε-hydride reduces from 3.06 GPa (25 °C) to 2.19 GPa (300 °C). |
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Bibliography: | USDOE Office of Nuclear Energy (NE) AC05-00OR22725 |
ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2017.07.319 |