Abstract
The dominant hydride precipitates have been well demonstrated to follow two types of orienta-tion relationships(ORs)with Ti matrix:OR1 with{0001}//{001},<1(2)10>//<110>and OR2 with{0001}//{1(1)1),<1(2)10>//<110>.Within the grains with special orientations,the complicated inter-actions of different hydride variants inside Ti-hydride diffusion layer are characterized in this work.For OR1 hydride layer,the orientations of{10(1)0}plane parallel to the sample surface and a-axis parallel to the normal direction prefer multiple OR1 variants.The orientations favorable for OR2 hydride layer are:{10(1)3}plane parallel to sample surface corresponding to the layer with one OR2 variant dominated and c-axis parallel to the surface normal with multiple OR2 variant layer preferred.Furthermore,{1012}ex-tension twins and{11(2)2}contraction twins are activated to accommodate the OR2 hydride-induced sur-face expansion and local misfit strain.The stimulation of these two twins is also orientation-dependent:{1012}and{1122}twins are observed in the grains with c-axis parallel to and deviated from the sur-face normal,respectively.The further variant selection for each twin mode is performed through shear accommodation of hydride-twin pairs.
基金项目
ProfEric Fleury for the hy-drogen charging deviceThe first author Qian Wang is grateful to the China Scholarship Council for the()
NETL
NSTL
维普
万方数据