TY - JOUR

T1 - Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

AU - Yuan, Xudong

AU - Şopu, Daniel

AU - Song, Kaikai

AU - Eckert, Jürgen

N1 - Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/2/24

Y1 - 2022/2/24

N2 - One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state.

AB - One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state.

KW - Metallic glass

KW - Molecular dynamics simulations

KW - Rejuvenation

KW - Relaxation

KW - Strain-hardening

UR - http://www.scopus.com/inward/record.url?scp=85125203559&partnerID=8YFLogxK

U2 - 10.3390/ma15051702

DO - 10.3390/ma15051702

M3 - Article

AN - SCOPUS:85125203559

VL - 15.2022

JO - Materials

JF - Materials

SN - 1996-1944

IS - 5

M1 - 1702

ER -