期刊
JOURNAL OF NUCLEAR MATERIALS
卷 475, 期 -, 页码 105-112出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2016.03.026
关键词
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资金
- EPSRC [EP/I003274/1]
- EPSRC [EP/H018921/1, EP/I003274/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I003274/1, EP/H018921/1] Funding Source: researchfish
Fracture properties of micro-scale zirconium hydrides and phase boundaries were studied using microcantilever testing methods. FIB-machined microcantilevers were milled on cross-sectional surfaces of hydrided samples, with the most highly-stressed regions within the delta-hydride film, within the alpha-Zr or along the Zr-hydride interface. Cantilevers were notched using the FIB and then tested in bending using a nanoindenter. Load-displacement results show that three types of cantilevers have distinct deformation properties. Zr cantilevers deformed plastically. Hydride cantilevers fractured after a small amount of plastic flow; the fracture toughness of the delta-hydride was found to be 3.3 +/- 0.4 MPam(1/2) and SEM examination showed transgranular cleavage on the fracture surfaces. Cantilevers notched at the Zr-hydride interface developed interfacial voids during loading, at loads considerably lower than that which initiate brittle fracture of hydrides. (C) 2016 Published by Elsevier B.V.
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