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284 results on '"Gao, Xuexu"'

17. Understanding the intrinsic mechanism of the giant magnetostriction in binary and alloyed FeGa solid solutions

Author

Niu, Jiejue, primary, Yan, Keyu, additional, Xu, Yichen, additional, Wu, Yuye, additional, Liu, Enke, additional, Fu, Zhongheng, additional, Li, Jiheng, additional, Gao, Xuexu, additional, Mu, Xing, additional, Liu, Bingjie, additional, Wang, Xiaoxiao, additional, Li, Yunquan, additional, Wang, Jingmin, additional, and Jiang, Chengbao, additional

Published
2024
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45. Laser powder bed fusion of crack-free 6061Al alloy using nano-sized TiO2modified powders

Author

Yuan, Chao, Ding, Rengen, Hou, Xiaodong, Guo, Qiujuan, and Gao, Xuexu

Abstract

Growth of coarse columnar grains during solidification easily leads to hot cracking during laser powder bed fusion (LPBF) of Al alloys. This work offers an alternative route to inhibit the formation of coarse columnar grains during LPBF process. The crack-free 6061Al alloy with a refined microstructure was obtained using nano-sized TiO2modified feedstock powders. After HIPPing, a nearly defect-free sample was obtained with a fracture elongation of 19.5 ± 0.14%. After artificially peak ageing treatment, the TiO2modified 6061Al alloy fabricated by LPBF exhibits a tensile strength of 336.1 ± 3.5 MPa and the fracture elongation is still 8.1 ± 0.92%. It is believed that the approaches used in this work are also effective for other LPBF fabrication of low-printability Al alloys.

Published
2024
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46. 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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