TY - GEN
T1 - Analysis of optimal compositions of ternary bulk metallic glasses with thermodynamic quantities
AU - Takeuchi, Akira
AU - Inoue, Akihisa
PY - 2007/1/1
Y1 - 2007/1/1
N2 - The relationships of optimal compositions of bulk metallic glasses (BMGs) have been analyzed with a set of thermodynamic quantities of mismatch entropy normalized with respect to Boltzmann's constant (Sσ/k B) and mixing enthalpy (Δ/Hmix) and with assistance of classification result of BMGs. The analysis shows clear dependence of the location of Sσ/kB and ΔHmix values for optimal compositions of ternary BMGs in Sσ/k B-ΔHmix chart in each alloy system. The ternary BMGs are summarized into four types: (1) Cu-based, (2) La-, Zr- and Ca-based, (3) Pd-based and (4) Fe- and Mg-based BMGs according to their maximum value of Sσ/kB ((5σ/kB) max) and the largest and negative value of ΔHmix ((ΔHmix)LN.) or their half values which are obtained for each system. These types of BMGs are related with the local arrangements of BMGs, which are widely accepted as an icosahedral structure for Metal-Metal type, a transformed tetragonal dodecahedrons and triacontrahedrons structure for Pd-Metalloid type, and a network-like structure for Metal-Metalloid type.
AB - The relationships of optimal compositions of bulk metallic glasses (BMGs) have been analyzed with a set of thermodynamic quantities of mismatch entropy normalized with respect to Boltzmann's constant (Sσ/k B) and mixing enthalpy (Δ/Hmix) and with assistance of classification result of BMGs. The analysis shows clear dependence of the location of Sσ/kB and ΔHmix values for optimal compositions of ternary BMGs in Sσ/k B-ΔHmix chart in each alloy system. The ternary BMGs are summarized into four types: (1) Cu-based, (2) La-, Zr- and Ca-based, (3) Pd-based and (4) Fe- and Mg-based BMGs according to their maximum value of Sσ/kB ((5σ/kB) max) and the largest and negative value of ΔHmix ((ΔHmix)LN.) or their half values which are obtained for each system. These types of BMGs are related with the local arrangements of BMGs, which are widely accepted as an icosahedral structure for Metal-Metal type, a transformed tetragonal dodecahedrons and triacontrahedrons structure for Pd-Metalloid type, and a network-like structure for Metal-Metalloid type.
KW - Alloy design
KW - Bulk metallic glass
KW - Mismatch entropy
KW - Mixing enthalpy
KW - Ternary system
UR - http://www.scopus.com/inward/record.url?scp=38349001228&partnerID=8YFLogxK
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U2 - 10.4028/0-87849-428-6.1988
DO - 10.4028/0-87849-428-6.1988
M3 - Conference contribution
AN - SCOPUS:38349001228
SN - 0878494286
SN - 9780878494286
T3 - Materials Science Forum
SP - 1988
EP - 1993
BT - Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
PB - Trans Tech Publications Ltd
T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
Y2 - 4 July 2006 through 8 July 2006
ER -