Correlation between structural heterogeneity and plastic deformation for phase separating FeCu metallic glasses.
Unlike crystalline metals, the plastic deformation of metallic glasses (MGs) involves a competition between disordering and structural relaxation ordering, which is not well understood, yet. Molecular dynamics (MD) simulations were performed to investigate the evolutions of strain localizations, short-range order (SRO) as well as the free volume in the glass during compressive deformation of Fe50Cu50MGs with different degrees of phase separation. Our findings indicate that the free volume in the phase separating MGs decreases while the shear strain localizations increase with increasing degree of phase separation. Cu-centered clusters show higher potential energies and Voronoi volumes, and bear larger local shear strains. On the other hand, Fe-centered pentagon-rich clusters in Cu-rich regions seem to play an important role to resist the shear transformation. The dilatation or annihilation of Voronoi volumes is due to the competition between ordering via structural relaxation and shear stress-induced deformation. The present study could provide a better understanding of the relationship between the structural inhomogeneity and the deformation of MGs.
School of Mechanical, Electrical &Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China.
Chuan-Xiao
CX
Peng
School of Mechanical, Electrical &Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China.
Kai-Kai
KK
Song
School of Mechanical, Electrical &Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China.
Li
L
Wang
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany.
Daniel
D
Şopu
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany.
Simon
S
Pauly
ErichSchmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria.|Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria.
Jürgen
J
Eckert
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