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Your search keyword '"Bao, Xiaoqian"' showing total 238 results
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238 results on '"Bao, Xiaoqian"'

42. Lattice Deformation of Tb 0.29 Dy 0.71 Fe 1.95 Alloy during Magnetization.

Author

Gong, Jiaxin, Li, Jiheng, Bao, Xiaoqian, and Gao, Xuexu

Subjects
MAGNETIC flux density, MAGNETIC fields, UNIT cell, LATTICE constants, MAGNETIZATION, RARE earth metals, TERBIUM
Abstract

In Tb-Dy-Fe alloy systems, Tb0.29Dy0.71Fe1.95 alloy shows giant magnetostrictive properties under low magnetic fields, thus having great potential for transducer and sensor applications. In this work, the lattice parameters of Tb0.29Dy0.71Fe1.95 compounds as a function of a magnetic field were investigated using in situ X-ray diffraction under an applied magnetic field. The results showed that the c-axis elongation of the rhombohedral unit cell was the dominant contributor to magnetostriction at a low magnetic field (0–500 Oe). As the magnetic field intensity increased from 500 Oe to 1500 Oe, although the magnetostrictive coefficient continued to increase, the lattice constant did not change, which indicated that the elongated c-axis of the rhombohedral unit cell rotated in the direction of the magnetic field. This rotation mainly contributed to the magnetostriction phenomenon at magnetic fields of above 500 Oe. The structural origin of the magnetostriction performance of these materials was attributed to the increase in rhombohedral lattice parameters and the rotation of the extension axis of the rhombohedral lattice. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Elucidating the Multi‐Scale Temperature Evolution and Densification Mechanisms of Amorphous Powders During Spark Plasma Sintering: Experiments and Modeling.

Author

Ding, Huaping, Bao, Xiaoqian, Zhang, Mao, Tang, Xuefeng, Niu, Yong, Gong, Pan, and Wang, Xinyun

Subjects
TEMPERATURE distribution, POWDERS, SINTERING, VISCOUS flow, SPECIFIC gravity, TEMPERATURE
Abstract

This work investigates amorphous powders' temperature distribution and densification mechanism at macroscopic and particle scales during spark plasma sintering. The evolution of contact necks between powders is studied by quasi‐in situ microstructure examination. Amorphous powders' contact mode changes from point contact to surface contact as sintering proceeds. The high current density concentration leads to local overheating at the particle necks. As the contact radius ratio increases, the temperature gap between the necks and the interior of the particles becomes less noticeable. In the early stage, localized high temperature and high stress around the necks significantly reduce the densification onset temperature of amorphous powders. As the relative density increases, the uneven temperature field at the particle scale disappears, while the macroscopic temperature gradient increases. The dominant densification mechanism of amorphous powders has transitioned from particle‐scale to macroscopic temperature. The sample temperature is significantly higher than the nominal sintering temperature, promoting the contribution of viscous flow to porosity elimination. This work can provide new insights into the evolution of multi‐scale temperature distribution during spark plasma sintering and its impact on the densification behavior of amorphous powders. [ABSTRACT FROM AUTHOR]

Published
2023
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