TY - JOUR
T1 - Local Topology vs. atomic-level stresses as a measure of disorder
T2 - Correlating structural indicators for metallic glasses
AU - Cheng, Y. Q.
AU - Ding, J.
AU - Ma, E.
PY - 2013
Y1 - 2013
N2 - This brief overview presents a critical assessment of the choice of structural parameters that may be used to describe the degree of local order/disorder in metallic glasses (MGs) and to establish the relationship between the amorphous structure and the properties of an MG. By summarizing our own quantitative analysis of representative MG models, we compare, and relate to one another, several measures of structural disorder in amorphous alloys, including the topology of quasi-equivalent clusters, the concept of free volume, and the atomic-level stresses. The model systems used for demonstrating the correlations are characterized by two different and prototypical types of short-range order (SRO): a Cu64Zr36 MG exhibiting pronounced icosahedral SRO, and a Pd82Si18 MG representative of a metal–metalloid system, with solute-centered tri-capped trigonal prisms as the dominant local motif. Also outlined are some ideas in terms of the relationship between the glass structures and properties, including the challenges in correlating the local structures with the propensity for relaxation and shear transformations.
AB - This brief overview presents a critical assessment of the choice of structural parameters that may be used to describe the degree of local order/disorder in metallic glasses (MGs) and to establish the relationship between the amorphous structure and the properties of an MG. By summarizing our own quantitative analysis of representative MG models, we compare, and relate to one another, several measures of structural disorder in amorphous alloys, including the topology of quasi-equivalent clusters, the concept of free volume, and the atomic-level stresses. The model systems used for demonstrating the correlations are characterized by two different and prototypical types of short-range order (SRO): a Cu64Zr36 MG exhibiting pronounced icosahedral SRO, and a Pd82Si18 MG representative of a metal–metalloid system, with solute-centered tri-capped trigonal prisms as the dominant local motif. Also outlined are some ideas in terms of the relationship between the glass structures and properties, including the challenges in correlating the local structures with the propensity for relaxation and shear transformations.
KW - Metallic Glasses
KW - Structural Indicators
KW - Structure–Property Relationship
UR - http://www.scopus.com/inward/record.url?scp=84981276106&partnerID=8YFLogxK
U2 - 10.1080/21663831.2012.722759
DO - 10.1080/21663831.2012.722759
M3 - Article
AN - SCOPUS:84981276106
SN - 2166-3831
VL - 1
SP - 3
EP - 12
JO - Materials Research Letters
JF - Materials Research Letters
IS - 1
ER -