Effects of heating rate on the process parameters of superplastic forming for Zr₅₅Cu₃₀Al₁₀Ni₅

Abstract

We investigated the effects of heating rate on the process parameters of superplastic forming for Zr₅₅Cu₃₀Al₁₀Ni₅₅ by differential scanning calorimetry. The continuous heating and isothermal annealing analyses suggested that the temperatures of glass transition and onset crystallization are heating rate-dependent in the supercooled liquid region. Then, the time-temperature-transformation diagram under different heating rates indicates that increasing the heating rate can lead to an increase of the incubation time at the same anneal temperature in the supercooled liquid region. Based on the Arrhenius relationship, we discovered that the incubation time increases by 1.08–1.11 times with double increase of the heating rate at the same anneal temperature, and then verified it by the data of literatures and the experimental results. The obtained curve of the max available incubation time reveals that the incubation time at a certain anneal temperature in the supercooled liquid region is not infinite, and will increase with increasing heating rate until this temperature shifts out of the supercooled liquid region because of exceeding critical heating rate. It is concluded that heating rate must be an important processing parameter of superplastic forming for Zr₅₅Cu₃₀Al₁₀Ni₅.

Keywords

bulk metallic glass / annealing / superplastic forming / heating rate / incubation time

References

[1] Inoue A, Takeuchi A Recent Progress in Bulk Glassy, nanoquasicrystalline and Nanocrystalline Alloys[J]. Mat. Sci. Eng. A., 2004, 375: 16-30.

[2] Liu L, Wu ZF, Zhang J Crystallization Kinetics of Zr₅₅Cu₃₀Al₁₀Ni₅ Bulk Amorphous Alloy[J]. J. Alloy. Compd., 2002, 339: 90-95.

[3] Kato H, Inoue A, Chen HS Heating and Structural Disordering Effects of the Nonlinear Viscous Flow in a Zr₅₅Al₁₀Ni₅Cu₃₀ Bulk Metallic Glass[J]. Appl. Phys. Lett., 2003, 83: 5 401-5 403.

[4] Gao YL, Shen J, Sun JF, . Crystallization Behavior of ZrAlNiCu Bulk Metallic Glass with Wide Supercooled Liquid Region[J]. Mater. Lett., 2003, 57: 1 894-1 898.

[5] Wang D, Liao G, Pan J, . Superplastic Micro-forming of Zr₆₅Cu_17.5Ni₁₀Al_7.5 Bulk Metallic Glass with Silicon Mould Using Hot Embossing Technology[J]. J. Alloy. Compd., 2009, 484: 118-122.

[6] Busch R, Bakke E, Johnson WL Viscosity of the Supercooled Liquid and Relaxation at the Glass Transition of the Zr_46.75Ti_8.25Cu_7.5Ni₁₀Be_27.5 Bulk Metallic Glass Forming Alloy[J]. Acta mater., 1998, 46: 4 725-4 732.

[7] Myung WN, Ryu SP, Hwang IS, . Viscous Flow Behavior of Bulk Amorphous Zr₅₅Al₁₀Ni₅Cu₃₀ Alloys[J]. Mater. Sci. Eng. A, 2001, 304: 691-695.

[8] Schroers J, Nguyen T, O’Keeffe S, . Thermoplastic Forming of Bulk Metallic Glass-Applications for MEMS and Microstructure Fabrication[J]. Mater. Sci. Eng. A, 2007, 449: 898-902.

[9] Schroers J, Pham Q, Desai A Thermoplastic Forming of Bulk Metallic Glass-a Technology for MEMS and Microstructure Fabrication[J]. J. Microelectromech. S., 2007, 16: 240-247.

[10] Liu L, Chan KC, Zhang T The Effect of Temperature on the Crystallization of Zr₅₅Cu₃₀Al₁₀Ni₅ Bulk Metallic Glass in the Glass Transition Region[J]. J. Alloy. Compd., 2005, 396: 114-121.

[11] Shen J, Wang G, Sun JF, . Superplastic Deformation Behavior of Zr_41.25Ti1_3.75Ni₁₀Cu_12.5Be_22.5 Bulk Metallic Glass in the Supercooled Liquid Region[J]. Intermetallics, 2005, 13: 79-85.

[12] Johnson WL, Kaltenboeck G, Demetriou MD, . Beating Crystallization in Glass-forming Metals by Millisecond Heating and Processing[J]. Science, 2011, 332: 828-833.

[13] Kissinger HE Reaction Kinetics in Differential Thermal Analysis[M]. Anal. Chem., 1957, 29: 1 702-1 706.

[14] Qin FX, Zhang HF, Ding BZ, . Nanocrystallization Kinetics of Ni-Based Bulk Amorphous Alloy[J]. Intermetallics, 2004, 12: 1 197-1 203.

[15] Biswas K, Ram S, Schultz L, . Crystallization Kinetics of Amorphous Fe₆₇Co_9.5Nd₃Dy_0.5B₂₀[J]. J. Alloy. Compd., 2005, 397: 104-109.

[16] Christian JW The Theory of Transformations in Metals and Alloys 2nd Edn[M], 1975 Oxford Pergamon 525-548.