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Characterization of zirconium hydrides in Zircaloy-4 cladding with respect to cooling rate
Kim, Sung-Dae,Rhyim, Youngmok,Kim, Ju-Seong,Yoon, Jonghun Elsevier 2015 Journal of nuclear materials Vol.465 No.-
<P><B>Abstract</B></P> <P>In order to characterize the habit planes and crystallographic relation between the α-matrix and various kinds of Zr hydrides, three different Zr hydrides including δ-hydride, γ-hydride, and surface hydride are produced by controlling the cooling rate from 0.5 to 300 °C/min. Analysis of SAED patterns and TEM images of the Zr hydrides demonstrates representative habit planes and crystallographic relation according to the hydride morphologies. The macroscopic δ-hydride has two kinds of habit planes such as <SUB> { 10 1 ¯ 7 } α </SUB> and <SUB> { 0002 } α </SUB> , while microscopic δ-hydride has the habit plane of <SUB> { 0002 } α </SUB> at the cooling rate of 0.5–10 °C/min. The microscopic γ-hydride has the major habit plane of <SUB> { 10 1 ¯ 7 } α </SUB> at the cooling rate of 300 °C/min in which the crystallographic relation between the γ-hydride and the α-Zr matrix as <SUB> ( 11 1 ¯ ) γ </SUB> ‖ <SUB> ( 01 1 ¯ 1 ) α </SUB> ; <SUB> ( 111 ) γ </SUB> ‖ <SUB> ( 0001 ) α </SUB> ; <SUB> [ 1 1 ¯ 0 ] γ </SUB> ‖ <SUB> [ 11 2 ¯ 0 ] α </SUB> .</P>