Browsing by Author "Su, Chun-Wei"

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Formation of (B2+D0(3)) two-phase microstructure in a Fe-23 Al-7 Ti alloy
(2007-11-01)
Su, Chun-Wei
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Chao, Chuen-Guang
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Liu, Tzeng-Feng
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交大名義發表
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National Chiao Tung University
As-quenched microstructure of the Fe-23 at% A1-7 at% Ti alloy was a mixture of (A2+D0(3)) phases. When the as-quenched alloy was aged at 1073 K for moderate times, D0(3) domains grew preferentially along (100) directions and extremely fine B2 particles occurred at a/2(100) antiphase boundaries (APBs). After prolonged aging at 1073 K, the 132 particles would grow to occupy the whole a/2(100) APBs. Consequently, the stable microstructure of the alloy at 1073 K was a mixture of (B2+D0(3)) phases.
Formation of (B2+D0(3))phases at al2(100) anti-phase boundary in an Fe-23 at.%Al-8.5 at.%Ti alloy
(2007-11-01)
Su, Chun-Wei
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Chao, Chuen-Guang
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Liu, Tzeng-Feng
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材料科學與工程學系
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Department of Materials Science and Engineering
The as-quenched microstructure of the Fe-23 at.%Al-8.5 at.%Ti alloy was a mixture of (A2 + D0(3)) phases. Transmission electron microscopy (TEM) examinations indicated that when the alloy was aged at 900 degrees C, the size of the D0(3) domains increased with increasing aging time, and an A2 -> (A2 + D0(3)) -> (B2 + D0(3)) transition occurred at a/2(100)anti-phase boundaries (APBs). This feature has never been reported by other workers in the Fe-Al-Ti alloy systems. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Orientation relationship between C14 precipitate and (A2+D0(3)) matrix in an Fe-20at.%Al-8at.%Ti alloy
(2007-07-01)
Su, Chun-Wei
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Jeng, Shiang-Cheng
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Chao, Chuen-Guang
;
Liu, Tzeng-Feng
;
交大名義發表
When the Fe-20at.%Al-8at.%Ti alloy was aged at 1000 degrees C for 1 h and then quenched, the microstructure of the alloy was a mixture of (A2 + D0(3) + C14) phases. By means of transmission electron microscopy and diffraction techniques the orientation relationship between the C14 precipitate and (A2+D0(3)) matrix was determined to be: (0001)C-14 parallel to(112), (1100)(C14)parallel to(110)(m), (11206411(111)m. This orientation relationship has not been reported in Fe-Al-Ti alloy systems before. (C) 2007 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
Ultrasensitivity of self-powered wireless triboelectric vibration sensor for operating in underwater environment based on surface functionalization of rice husks
(2019-06-01)
Lai, Sz-Nian
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Chang, Chih-Kai
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Yang, Cheng-Shiun
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Su, Chun-Wei
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Leu, Chyi-Ming
We demonstrate the self-powered wireless triboelectric vibration sensor as made from the naturally nanoporous SiO2 particles for allowing the detection of the vibrations and movement in the underwater environment. The nanoporous SiO2 particles are directly converted from the rice husks (referred to as RHsiO2), which exhibit strongly interacting surface hydroxyl groups. Through the enzymatic treatments, the surface potential of the RHsiO2 particles can be modulated to obtain either an extremely low or strongly high electronegativity. Specifically, by adding fluorinated groups using fluoroalkylsilane (FOTS) treatment to obtain RHsiO2-F, the charge density of the RHsiO2-F triboelectric nanogenerator (TENG) can be enhanced similar to 56.67-fold as compared to the untreated RHsiO2-TENG. The power density of the RHsiO2-F TENG is increased from 0.077 mWm(-2) to 261 mWm(-2). The RHsiO2-F particles are encapsulated in a quartz cube to fabricate a self-powered wireless sensor that can be stabilized for operating in an underwater environment at various temperatures. The theoretical calculation further demonstrates that the triboelectric potential is dramatically established between the surface functionalized RHsiO2-F particles and the quartz's surface. With porous nature of rice husks covered with nano-Si is of a high functionality for designing a new-type TENG which has a great potential to apply in the environmental monitoring.