Browsing by Author "Tsai, Ming-Hung"

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Corrosion mechanism of annealed equiatomic AlCoCrFeNi tri-phase high-entropy alloy in 0.5 M H2SO4 aerated aqueous solution
(2019-08-15)
Yen, Chao-Chun
;
Lu, Hsueh-Ning
;
Tsai, Ming-Hung
;
Wu, Bo-Wei
;
Lo, Yu-Chieh
This work investigates the corrosion mechanism of annealed equiatomic AlCoCrFeNi tri-phase alloy in 0.5 M H2SO4 aerated aqueous solution. Experimental results indicate that the B2 matrix is preferentially corroded away while grain-boundary FCC and labyrinth-like BCC endure, consistent with the tendency of formation energy for monolayer hydroxide on the (001) plane of three phases calculated by the first principle based on density function theory. Furthermore, the stable passive current density is related to lower k(sp) values of Co(OH)(3), Fe (OH)(3), and Cr(OH)(3), while the annealing effect on enhancing corrosion resistance is owing to the more uniformity of passive hydroxide film.
Thermal Stability and Performance of NbSiTaTiZr High-Entropy Alloy Barrier for Copper Metallization
(2011)
Tsai, Ming-Hung
;
Wang, Chun-Wen
;
Tsai, Che-Wei
;
Shen, Wan-Jui
;
Yeh, Jien-Wei
Development of better diffusion barriers for Cu metallization is one of the key issues for the microelectronics industry. Although metallic diffusion barriers offer many advantages, their application is hindered due to their inferior thermal stability relative to ceramic barriers. Here we report on a metallic diffusion barrier, NbSiTaTiZr, which shows thermal stability comparable to ceramic barriers. The outstanding performance of NbSiTaTiZr is due to its better structural and chemical stability at high temperatures. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.056111jes] All rights reserved.