Hydrogen-induced microstructure, texture and mechanical property evolutions in a high-pressure torsion processed zirconium alloy
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How semi-coherent b.c.c. hydride interfacial interactions affect the inelastic deformation and fracture behavior of h.c.p. zirconium alloys
2019, Mechanics of MaterialsCitation Excerpt :These local effects occur due to the interfacial planes having different lattice parameters and atomic arrangements between the parent and hydride phases (M.P. Puls, 1991). Along the interfaces between the close-packed planes, which have misorientation dislocations, both misfit strains and orientations relations (ORs) have to be physically accounted for to physically represent the semi-coherent resultant interfaces between the different phases (Motta et al., 2007; Porter et al., 2009; Wang et al., 2012; Gu and Zhang, 2014; Pilania et al., 2014). Our objective in this paper, therefore, is to investigate how local microstructural characteristics, such as different crystalline phases, misfit strains, hydride morphologies, and dislocation density accumulation can affect crack nucleation and growth in zirconium alloys with β b.c.c. hydrides.
Study of the microstructure evolution of zirconium alloy during deuterium absorption at high temperature
2017, Journal of Nuclear MaterialsCitation Excerpt :The ε hydride has a higher hydrogen content, and has a “herringbone” morphology composed of small twins [28]. It has been shown that the ε hydride has a lower fracture toughness than the δ hydride [29], and the formation of the ε hydride leads to a larger volume expansion and severe cracking [13]. For the γ hydride, it has been reported that its stability is affected by the cooling rate [30], temperature [31] and matrix microstructure [32].
Cr depletion of the second phase particles in a Zr-Sn-Nb-Fe-Cr alloy: A TEM and SIMS study
2017, Journal of Nuclear MaterialsCitation Excerpt :It is evident that after the HPT processing, all samples maintained a single hcp α-Zr phase. Similar results have also been reported for Zr-4 [10,12,14]. However, it is quite different from the reports that the HPT processing of pure Zr [9,11] and Zr-2.5%Nb [13] resulted in α-Zr to ω-Zr phase transformation.
Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction
2016, Journal of Alloys and CompoundsA review on hydride precipitation in zirconium alloys
2015, Journal of Nuclear Materials