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Studies from Hunan University Add New Findings in the Area of Nanocrystals (Local atomic structures in grain boundaries of bulk nanocrystalline...

September 9, 2014



Studies from Hunan University Add New Findings in the Area of Nanocrystals (Local atomic structures in grain boundaries of bulk nanocrystalline aluminium: A molecular dynamics simulation study)

By a News Reporter-Staff News Editor at Physics Week -- Investigators publish new report on Nanocrystals. According to news reporting from Changsha, People's Republic of China, by VerticalNews journalists, research stated, "The microstructures of grain boundaries (GBs) in bulk nanocrystalline aluminium have been investigated by a large-scale molecular dynamics method. Bulk nanocrystalline aluminium is obtained directly by liquid quenching at an appropriate cooling rate, which has narrow grain-size distribution and high-angle GBs."

The news correspondents obtained a quote from the research from Hunan University, "It is found that up to 89.75% GB atoms (named as GB1 atoms) are located at the nearest-neighbour coordination shell around nanograins; others (named as GB2 atoms) are mainly at triple junctions. Local atomic structures in the GBs are quantified in terms of a recently developed method, in which the neighbours of an atom are identified with a parameter-free topological criterion rather than a fixed cut-off distance rę. The results demonstrate that though there are a large number of different cluster types in both the GB1 and the GB2 regions, only a few ones with FCC-like order appear with high frequency in the GB1 region and play a crucial role in the microstructural feature of the GB1. The GB1 region displays short-to-long range order."

According to the news reporters, the research concluded: "The GB2 region presents ICO- and BCC-like short-range orders whose degrees are in between the liquid and amorphous, but the medium-range order at the cluster-scale is very weak."

For more information on this research see: Local atomic structures in grain boundaries of bulk nanocrystalline aluminium: A molecular dynamics simulation study. Computational Materials Science, 2014;92():199-205. Computational Materials Science can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Computational Materials Science - www.elsevier.com/wps/product/cws_home/523412)

Our news journalists report that additional information may be obtained by contacting Z.Y. Hou, Hunan Univ, Sch Phys & Microelectron Sci, Changsha 410082, Hunan, People's Republic of China. Additional authors for this research include Z.A. Tian, Y.F. Mo and R.S. Liu.

Keywords for this news article include: Changsha, People's Republic of China, Asia, Emerging Technologies, Molecular Dynamics, Nanocrystalline, Nanocrystals, Nanotechnology, Physics

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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