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MICROSTRUCTURE-PROPERTY RELATIONSHIPS OF HETEROGENEOUS ELECTROCERAMICS南策文摘 要:<正>Based on an improved effective-medium theory and aproper treatment of ac response of grain boundary barrier layer,thetheoretical relationships describing ac electrical properties of heteroge-neous electroceramics are discussed in terms of the theoretical relation-ships......
Electrocrystallization nucleation and growth of NiFe alloys on brass substrate ZHANG Zhao(张 昭) (Department of Chemistry, Zhejiang University, Hangzhou 310027, China) Abstract: The electrocrystalliztion nucleation and growth process of Ni-Fe alloy was studied using cyclic voltammetry and chronoamperometry. The results show that, in the case of high deposition overpotential......
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J. Cent. South Univ. (2020) 27: 432-448 DOI: https://doi.org/10.1007/s11771-020-4307-0 Cooperative task allocation for heterogeneous multi-UAV using multi-objective optimization algorithm WANG Jian... of flexibility, cheapness and consistence, the performance of heterogeneous multi-UAVs with proper cooperative task allocation is superior to over the single UAV. Accordingly, several constraints......
of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China Central South University Press and Springer-Verlag Berlin Heidelberg 2016 Abstract: Nucleation... nucleation mechanism accords with a progressive nucleation. Temperature increase does favor in increasing nickel content in the ferronickel (Ni-Fe co-deposition products), while Fe2+ concentration......
℃, 24 h). During single-aging process, the nucleation mechanism of precipitated phases of the alloy is mainly realized by dislocation, vacancy, stacking fault, sub-grain boundary, grain boundary and other crystal defects. In the course of two-stage aging, the generated G.P. zones or clustered atoms during the pre-aging process play ready-made heterogeneous nucleation role in the from process......
Nucleation barrier height in undercooled metallic meltsGang WANG,Dechang ZENG and Zhongwu LIU School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China摘...,and the variation of nucleation barrier height in undercooled metallic melts with respect to undercooling was studied respectively based on two kinds of forms of local free energy density.The......
Al-7Si cast alloys is Al-5Ti-lB master alloy [1,2]. It was assumed that Al3Ti particles must be the heterogeneous nucleation sites as they are a pro-peritectic phase, which could nucleate the solid.... [18] HO C R, CANTOR B. Heterogeneous nucleation of solidification of Si in Al-Si and Al-Si-P alloys [J]. Acta Metallurgica et Materialia, 1995, 43: 3231-3246. [19] TURNBULL D. Theory of catalysis......
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