TY - JOUR
T1 - Glass formability and the Al-Au system
AU - Egami, Takeshi
AU - Ojha, Madhusudan
AU - Nicholson, Donald M.
AU - Louzguine-Luzgin, Dmitri V.
AU - Chen, Na
AU - Inoue, Akihisa
N1 - Funding Information:
The work at the University of Tennessee and Oak Ridge National Laboratory was supported by the US Department of Energy, Office of Basic Energy Sciences, Materials Science and Engineering Division. The work at Tohoku University was supported by World Premier International Research Center (WPI) Initiative for Atoms, Molecules and Materials; Global COE, Materials Integration Center of Education and Research, Tohoku University, MEXT, Japan.
PY - 2012/2/21
Y1 - 2012/2/21
N2 - The aluminum-gold system exhibits various features that suggest high glass formability, such as a deep eutectic, formation of icosahedral clusters in the intermetallic compound near the eutectic minimum and a strongly negative heat of mixing. However, it is very difficult to form a glass with this system. Various issues related to glass formability are discussed using the Al-Au system as a negative test-case. In particular, the atomic level pressure was calculated from first principles for the first time for Al 2Au, AlAu 2 and AlAu 4 intermetallic compounds. The atomic level pressure is very high in these compounds, suggesting frustrated electronic states which destabilize both crystalline and glassy phases.
AB - The aluminum-gold system exhibits various features that suggest high glass formability, such as a deep eutectic, formation of icosahedral clusters in the intermetallic compound near the eutectic minimum and a strongly negative heat of mixing. However, it is very difficult to form a glass with this system. Various issues related to glass formability are discussed using the Al-Au system as a negative test-case. In particular, the atomic level pressure was calculated from first principles for the first time for Al 2Au, AlAu 2 and AlAu 4 intermetallic compounds. The atomic level pressure is very high in these compounds, suggesting frustrated electronic states which destabilize both crystalline and glassy phases.
KW - aluminum-gold alloy
KW - glass formability
KW - metallic glass
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U2 - 10.1080/14786435.2011.630692
DO - 10.1080/14786435.2011.630692
M3 - Article
AN - SCOPUS:84856872656
SN - 1478-6435
VL - 92
SP - 655
EP - 665
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 6
ER -