TY - JOUR
T1 - Characterization of structural inhomogeneity in Al88Ce8Co4 metallic glass
AU - Gu, Bin
AU - Liu, Feng
N1 - Publisher Copyright:
© 2016 Acta Materialia Inc.
PY - 2016/6/15
Y1 - 2016/6/15
N2 - Structural inhomogeneity is found to be a promising way to overcome intrinsic brittleness and to improve the plasticity of metallic glasses (MGs), although such inhomogeneity has not been well-understood. In this study, quantitative observations and theoretical explanations on the structural inhomogeneity were presented for Al88Ce8Co4 MG. Applying a technique called energy filtered electron diffraction (EFED), different medium-range orders (MROs) reflected from conspicuous and inconspicuous prepeaks, were observed, which, following reduced pair distribution functions obtained from the EFED measurement, correspond to different short-range orders (SROs). Then using reverse Monte Carlo (RMC) simulation, the structural inhomogeneity is attributed to diversity of Al-Co clusters, which lead to loosely and densely packed local atomic structures and contribute to soft and hard regions, as evidenced by synchrotron radiation X-ray diffraction, dynamic mechanical analysis and nano-indentation. The obtained structural essence of intrinsic inhomogeneity in MGs lays the foundation for further understanding and designing MGs with high plasticity, by adjusting properly inhomogeneous structure.
AB - Structural inhomogeneity is found to be a promising way to overcome intrinsic brittleness and to improve the plasticity of metallic glasses (MGs), although such inhomogeneity has not been well-understood. In this study, quantitative observations and theoretical explanations on the structural inhomogeneity were presented for Al88Ce8Co4 MG. Applying a technique called energy filtered electron diffraction (EFED), different medium-range orders (MROs) reflected from conspicuous and inconspicuous prepeaks, were observed, which, following reduced pair distribution functions obtained from the EFED measurement, correspond to different short-range orders (SROs). Then using reverse Monte Carlo (RMC) simulation, the structural inhomogeneity is attributed to diversity of Al-Co clusters, which lead to loosely and densely packed local atomic structures and contribute to soft and hard regions, as evidenced by synchrotron radiation X-ray diffraction, dynamic mechanical analysis and nano-indentation. The obtained structural essence of intrinsic inhomogeneity in MGs lays the foundation for further understanding and designing MGs with high plasticity, by adjusting properly inhomogeneous structure.
KW - Energy filtered electron diffraction
KW - Heterogeneity
KW - Metallic glass
KW - Microstructure
KW - Synchrotron diffraction
UR - http://www.scopus.com/inward/record.url?scp=84964374888&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2016.04.009
DO - 10.1016/j.actamat.2016.04.009
M3 - 文章
AN - SCOPUS:84964374888
SN - 1359-6454
VL - 112
SP - 94
EP - 104
JO - Acta Materialia
JF - Acta Materialia
ER -