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Hardening and crystallization in monatomic metallic glass during elastic cycling

Published online by Cambridge University Press:  19 May 2015

Ronggen Cao ,
Yun Deng  and
Chuang Deng
Ronggen Cao
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, China
Yun Deng*
Affiliation:
Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
Chuang Deng*
Affiliation:
Department of Mechanical Engineering, The University of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

While conventional metallic glass (MG) is usually an alloy that contains at least two types of different elements, monatomic metallic glass (MMG) in body-centered cubic metals has recently been vitrified experimentally through ultrafast quenching. In this research, MMG in Ta was vitrified by molecular dynamics simulations and used as a model system to explore the atomistic mechanism of hardening in MG under cyclic loading well below the yield point. It was found that significant structural ordering was caused during the elastic cycling without accumulating apparent plastic strain, which ultimately led to the crystallization of MG that has been long conjectured but rarely directly proved before. It was also revealed that tensile stresses were more likely to induce structural ordering and crystallization in MG than compressive stresses.

Keywords

amorphouscrystalsimulation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 11 , 14 June 2015 , pp. 1820 - 1826
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Franz Faupel

References

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