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Molecular Dynamics Based Study on Ductility Enhancement Effect of Nano-scale Void in Fine-grained Metallic Materials

Published online by Cambridge University Press:  11 July 2012

Shin Taniguchi ,
Toshihiro Kameda  and
Toshiyuki Fujita
Shin Taniguchi
Affiliation:
Department of Engineering Mechanics and Energy, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
Toshihiro Kameda
Affiliation:
Faculty of Engineering, Information and Systems, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
Toshiyuki Fujita
Affiliation:
College of Engineering Systems, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
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Abstract

In fine-grained metallic materials, the dominant grain boundary (GB) process, such as dislocation emission, dislocation absorption, and dislocation pile-up, causes non-uniform deformation, which results in high yield stress and low ductility. When a nano-scale void is introduced, the dislocation activity enhancement around the void could inhibit GB fracture and enhance ductility. In this study, by considering nanocrystalline Cu models, the influence of an intragranular nano-scale void on the fracture process has been investigated through molecular dynamics simulation. The dependence of ductility enhancement on the grain size and void size has especially been discussed at low and room temperatures. Sufficient dislocation activity enhancement accompanied by optimal void growth causes a fracture mode transition from GB fracture to transgranular fracture. While the ductility enhancement strongly depends on the void size at low temperature, it depends on the grain size at room temperature. The strong dependence of ductility enhancement on the temperature is found in the case of relatively small grains.

Keywords

dislocationsductilitygrain size
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1470: Symposium XX – Computational Materials Design in Heterogeneous Systems , 2012 , mrss12-1470-xx03-12
Copyright
Copyright © Materials Research Society 2012

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References

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