Author
Nai-chao Zheng
Bio: Nai-chao Zheng is an academic researcher from Hunan University. The author has contributed to research in topics: Glass transition & Amorphous solid. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.
Topics: Glass transition, Amorphous solid, Microstructure
Papers
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TL;DR: In this paper, the effects of different initial melt temperatures on the microstructure evolution during the solidification process of liquid Mg 7 Zn 3 alloys were investigated by molecular dynamics simulation.
10 citations
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TL;DR: In this paper, the second peak splitting in pair distribution function (PDF) g (r ) curve of Mg 70 Zn 30 metallic glass is mainly caused by the intercross-shared (IS) cluster linked of two icosahedra.
43 citations
TL;DR: In this paper, the structural properties of single-component metallic glasses of aluminum were examined using a molecular dynamics simulation based on semi-empirical many-body potential, derived from the embedded atom method.
Abstract: In this study we examine the structural properties of single-component metallic glasses of aluminum. We use a molecular dynamics simulation based on semi-empirical many-body potential, derived from the embedded atom method (EAM). The radial distribution function (RDF), common neighbors analysis method (CNA), coordination number analysis (CN) and Voronoi tessellation are used to characterize the metal’s local structure during the heating and cooling (quenching). The simulation results reveal that the melting temperature depends on the heating rate. In addition, atomic visualization shows that the structure of aluminum after fast quenching is in a glassy state, confirmed quantitatively by the splitting of the second peak of the radial distribution function, and by the appearance of icosahedral clusters observed via CNA technique. On the other hand, the Wendt-Abraham parameters are calculated to determine the glass transition temperature (T
g
), which depends strongly on the cooling rate; it increases while the cooling rate increases. On the basis of CN analysis and Voronoi tessellation, we demonstrate that the transition from the Al liquid to glassy state is mainly due to the formation of distorted and perfect icosahedral clusters.
19 citations
TL;DR: In this article, a comprehensive review on the structure transition in the metallic liquid together with the recent progress of its impact on the following microstructure and properties after solidification is provided.
15 citations
TL;DR: In this article, the polymorph selection during rapid solidification of zinc melt was investigated by molecular dynamics simulation, and the results reveal that the cooling rate has no observable effect on the microstructure as T > T c (T c is the onset temperature of crystallization); and at the first stage, although microstructures are different, the morphologies of nucleus are similar, which are composed of HCP and FCC layers.
15 citations
TL;DR: In this paper, a MD simulation of liquid Cu46Zr54 alloys has been performed for understanding the effects of initial melt temperatures on the microstructural evolution and mechanical properties during quenching process.
Abstract: A MD simulation of liquid Cu46Zr54 alloys has been performed for understanding the effects of initial melt temperatures on the microstructural evolution and mechanical properties during quenching process. By using several microstructural analyzing methods, it is found that the icosahedral and defective icosahedral clusters play a key role in the microstructure transition. All the final solidification structures obtained at different initial melt temperatures are of amorphous structures, and their structural and mechanical properties are non-linearly related to the initial melt temperatures, and fluctuated in a certain range. Especially, there exists a best initial melt temperature, from which the glass configuration possesses the highest packing density, the optimal elastic constants, and the smaller extent of structural softening under deforming.
6 citations