首页|Multi-phase interaction accompanied with the phase transformation process in U-21 at%Nb alloy quantified by in-situ neutron diffraction during heating
Multi-phase interaction accompanied with the phase transformation process in U-21 at%Nb alloy quantified by in-situ neutron diffraction during heating
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NSTL
Elsevier
The present work is performed to answer quantitatively the still-open question on the multi-phase interaction accompanied with phase transformation process for a U-21 at%Nb alloy via in-situ neutron diffraction (ND), which is one of the important materials for nuclear engineering (e.g., a promising metallic fuel candidate). Both the structure and micro-strain have been simultaneously revealed for all the phases including alpha-U, gamma-Nb and gamma-U. Based on Rietveld refinement analysis of in-situ ND patterns for a series temperature from RT up to 850 degrees C, the volume fraction of each phase has been quantitatively achieved as well as the lattice parameters. It is found from micro-strain analysis that the thermal-induced lattice strain for alpha-U phase is strongly anisotropic while that for gamma-Nb and gamma-U phases is isotropic. Within the multi-phase region, gamma-Nb phase possesses always the soft response while alpha-U and gamma-U phases show the hard response. There exists a phase transformation window (PTW) between the region of alpha-U and gamma-U phases, where fluctuation-like behavior appears in micro-strain response. ND pattern for the second heating at 630 degrees C is obviously different from that for the first one but similar with that at 640 degrees C, which means that the phase transformation has been facilitated. It is found that micro-strain would have a significant effect upon the phase transformation process. Those findings could provide some insight into both the fundamental understanding of multi-phase interaction accompanied with phase transformation and technological aspects including materials design and properties development through engineering the multi-phase interaction and thus phase transition process. (C) 2022 Published by Elsevier B.V.
NSTL
Elsevier
