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Published May 15, 2000 | Published
Journal Article Open

Thermodynamics of Cu_(47)Ti_(34)Zr_(11)Ni_8, Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 and Zr_(57)Cu_(15.4)Ni_(12.6)Al_(10)Nb_5 bulk metallic glass forming alloys


The differences in the thermodynamic functions between the liquid and the crystalline states of three bulk metallic glass forming alloys, Cu_(47)Ti_(34)Zr_(11)Ni_8, Zr_(52.5_Cu_(17.9)Ni_(14.6)Al_(10)Ti_5, and Zr_(57)Cu_(15.4)Ni_(12.6)Al_(10)Nb_5, were calculated. The heat capacity was measured in the crystalline solid, the amorphous solid, the supercooled liquid, and the equilibrium liquid. Using these heat capacity data and the heats of fusion of the alloys, the differences in the thermodynamic functions between the liquid and the crystalline states were determined. The Gibbs free energy difference between the liquid and the crystalline states gives a qualitative measure of the glass forming ability of these alloys. Using the derived entropy difference, the Kauzmann temperatures for these alloys were determined.

Additional Information

© 2000 American Institute of Physics. Received 14 December 1999; accepted 18 February 2000. The authors thank S. Bossuyt, H. Choi-Yim, and C. C. Hays for assistance in the laboratory and John Haygarth of Teledyne Wah-Chang for providing material for the TEMPUS samples. They also thank Team TEMPUS for helping make the MSL-1 space shuttle flight experiments successful. This work was supported by NASA (Grant No. 4NAG8-1182). S.C.G. acknowledges fellowship support from NDSEG.

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