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11 results on '"You, Zhongyuan"'

8. Effect of α phase on high-strain rate deformation behavior of laser melting deposited Ti-6.5Al-1Mo-1V-2Zr titanium alloy

Author

You Zhongyuan, Shuquan Zhang, Chengwen Tan, Rong Chen, Zhuo Li, Xiuchen Zhao, Zhihua Nie, and Xiaodong Yu

Subjects
010302 applied physics, Materials science, Annealing (metallurgy), Mechanical Engineering, Alloy, Titanium alloy, 02 engineering and technology, engineering.material, Strain rate, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Laser, Microstructure, 01 natural sciences, law.invention, Mechanics of Materials, law, 0103 physical sciences, Volume fraction, engineering, General Materials Science, Composite material, 0210 nano-technology, Crystal twinning
Abstract

Laser melting deposition (LMD) technology enables the use of complex titanium alloy parts in ballistic applications such as lattice armors and warheads. The effect of the α phase of a LMD Ti-6.5Al-1Mo-1V-2Zr titanium alloy during compression at a high strain rate of 3000 s⁻1 was investigated. Various morphologies and textures of the α phase of the LMD alloy were obtained by annealing at different temperatures at the β transus, followed by furnace cooling. It was found that all the α phases of the annealed microstructures exhibit two fiber textures, α and 16 ¯ 19>α, parallel to the building direction. The reason is that the β directions of the prior-β grains were parallel to the building direction. Due to a high Schmidt factor, {1012} twinning occurs in the α phases with the α fiber texture during the high-strain rate deformation. After annealing at 970 °C, the volume fraction of the α phases with the α fiber texture increases significantly to 51.4 vol%, which leads to a significant improvement of 14.3% in the uniform ductility strain. Moreover, with an increase in the annealing temperature from 930 °C to 970 °C, the flow strength of the sample decreases slightly by 2%.

Published
2019

11. High current output direct-current triboelectric nanogenerator based on organic semiconductor heterojunction

Author

You, Zhongyuan, Wang, Shuting, Li, Zezhong, Zou, Yuxiao, Lu, Tianyu, Wang, Fang, Hu, Bingxi, Wang, Xin, Li, Lian, Fang, Weihai, and Liu, Ying

Abstract

The high demand on direct current (DC) power source generated through triboelectric effect drives the research on semiconductor-based triboelectric nanogenerators (TENGs), which have lower internal resistance. With high flexibility, organic semiconductor-based DC TENGs are more intriguing. In this work, we use organic semiconductor Poly (3,4-ethylene dioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) as a friction layer to make organic semiconductor-based TENGs. By experimentally analyzing the work functions of PEDOT: PSS, Al alloy, Si, ITO, Cu, and graphene, the DC devices with PEDOT: PSS/Al alloy triboelectric layers exhibit impressive performance. Our PEDOT: PSS/Al alloy DC TENGs achieves open-circuit voltage about 1V, and short-circuit current up to 309 μA. The internal resistance of the DC TENG is tested to be about 2◊104Ω, and the power density reaches 11.67mW/m2. Effects of the load pressure, sliding speed, and size of the devices are systematically studied in this work. The charging probability of our DC TENGs as power sources and human body motion detecting capability as force sensors are all experimentally tested, indicating further potential applications of our PEDOT: PSS/Al alloy DC TENGs as flexible energy sources and motion detector.

Published
2021
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