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铁硅硼金属玻璃变形行为的密度泛函理论研究

A density functional theory study on the deformation behaviors of Fe-Si-B metallic glasses.

作者信息

Zheng Guang-Ping

机构信息

Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

出版信息

Int J Mol Sci. 2012;13(8):10401-10409. doi: 10.3390/ijms130810401. Epub 2012 Aug 21.

DOI:10.3390/ijms130810401
PMID:22949869
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3431867/
Abstract

Density functional theory has been employed to investigate the deformation behaviors of glassy Fe-Si-B model systems prepared by ab initio molecular dynamics. The atomistic deformation defects which are closely related to the local dilation volumes or excess volumes and unstable bonding have been systematically analyzed. It has been found that the icosahedral structures are relatively stable under shear deformation until fracture occurs. Plastic flow is indicated by interruption of percolating icosahedral structures, caused by unstable Fe-Si bonding of p-s hybridization in nature.

摘要

密度泛函理论已被用于研究通过从头算分子动力学制备的玻璃态铁硅硼模型体系的变形行为。与局部膨胀体积或过剩体积以及不稳定键合密切相关的原子变形缺陷已被系统分析。研究发现,在剪切变形直至断裂发生之前,二十面体结构相对稳定。塑性流动表现为渗流二十面体结构的中断,这本质上是由p-s杂化的铁硅键不稳定引起的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/ff1c21956456/ijms-13-10401f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/9ec0a278035e/ijms-13-10401f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/07d9ad1cb8d4/ijms-13-10401f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/8f8bf9a0a566/ijms-13-10401f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/b6c05aec8c49/ijms-13-10401f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/ef9b72d5ced9/ijms-13-10401f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/ff1c21956456/ijms-13-10401f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/9ec0a278035e/ijms-13-10401f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/07d9ad1cb8d4/ijms-13-10401f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc9f/3431867/8f8bf9a0a566/ijms-13-10401f3.jpg
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