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Wang, Huamiao,Lee, Soo Yeol,Huang, E-Wen,Jain, Jayant,Li, Dayong,Peng, Yinghong,Choi, Ho-Suk,Wu, Peidong Elsevier 2020 Journal of the mechanics and physics of solids Vol.135 No.-
<P><B>Abstract</B></P> <P>This study used <I>in-situ</I> neutron diffraction measurements and Elastic ViscoPlastic Self-Consistent polycrystal plasticity model, which incorporates a Twinning and DeTwinning scheme (denoted by EVPSC-TDT), to examine the macro-and micro-mechanical behaviors of a rolled AZ31B plate subjected to uniaxial tension. Three specimens were specifically designed for minimum, maximum and intermediate twinning: (1) loading along the rolling direction, (2) loading along the plate normal, and (3) loading along the direction 45° with respect to the plate normal. Apart from the macroscopic stress strain response, the measured diffraction intensities and internal elastic strains were obtained to examine the activities of the deformation modes at the grain level. The diffraction intensity evolution signaled the volume fraction change of twinning, while the internal elastic strain evolution designated the stress partitioning among the grain orientations. The effect of the surrounding grains on the development of the internal elastic strain was investigated by identifying the corresponding deformation mechanisms. Notably, the corresponding modeling work revealed that the EVPSC-TDT model permitted the prediction of the strain hardening and anisotropic behavior along the directions with minimum, maximum and intermediate twinning at the macroscale, and the evolution of the diffraction intensities and internal strains at the microscale. The results provide a physical understanding of the effects of the load direction, texture and surrounding grains on the role of the deformation modes in hexagonal close-packed polycrystalline materials.</P>
Ga2O3/HZSM-48 for dehydrogenation of propane: Effect of acidity and pore geometry of support
Yingjie Ren,Jie Wang,Yinghong Yue,Zi Gao,Weiming Hua 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
The catalytic performance of propane dehydrogenation over HZSM-48 supported Ga2O3 catalysts in the presence of CO2 was investigated, and compared with that of HZSM-5 supported ones. The activity decreases with the increase of Si/Al ratio of catalyst support while the selectivity to propene shows a contrary trend. Ga2O3/HZSM-48 with Si/Al ratio of 130 has the best propene yield of 22%. HZSM-48supported catalysts exhibit higher selectivities to propene than the HZSM-5 supported ones at similar propane conversion, due to their weak acid strength. However, their stabilities are not so good as those of the latters, owing to their more weak acid sites and unidimensional pore structures.