Deformation behaviour of Zr-based metallic glass and metallic glass composite at elevated temperatures

• Applicant: Professor Dr.-Ing. Jürgen Eckert
• Subject Area: Thermodynamics and Kinetics as well as Properties of Phases and Microstructure of Materials ; Synthesis and Properties of Functional Materials
• Term: from 2005 to 2007
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5452100

• Final Report Year: 2010

Final Report Abstract

In this project, the deformation behaviour of Zr55Cu30Ni5Al10 monolithic bulk metallic glass at different strain rates and at elevated temperatures was to be investigated in comparison with partially nanocrystallized specimens obtained by previous annealing. The comparison of the different types of samples aimed to allows for a better understanding of the effect of nanocrystallization on the high temperature deformation behaviour and the transition from inhomogeneous to homogeneous flow. In addition, it was of interest to optimize the casting conditions of the Zr66.4Nb6.4Cu10.5Ni8.7Al8 bulk metallic glass composite with ductile dendrites in order to control and establish a different length scale and volume fraction of dendrites, and hence to understand the effect of the dendrites on the viscous flow at various strain rates and at elevated temperatures. Following these lines, the deformation behaviour at elevated temperatures between monolithic bulk metallic glass, partially nanocrystallized bulk metallic glass and bulk metallic glass composite with ductile phase was systematically investigated and compared. The above described approach aimed to provide information concerning the deformation and flow behaviour of metallic glasses and composites with different length-scale second phases at elevated temperatures, and to obtain results that can be used to further optimize the processing conditions for shaping of such materials.

Publications

• "Nanostructured Composite Materials with Improved Deformation Behavior", Adv. Eng. Mater. 7, 587 (2005)
  J. Eckert, U. Kühn, J. Das, S. Scudino, N. Radtke
  
• "Formability Evolution of Both Monolitic and Multiphase Zr-Based Bulk Metallic Glasses", in: "The Mechanical Behavior of Materials X", (Hrsg. S.W. Nam, Y.W. Chang, S.B. Lee, N.J. Kim). Key Eng. Mater. 345-346, 105 (2007)
  K.S. Lee, H.-J. Jun, C.P. Kim, J. Eckert, Y.W. Chang
  
• "Influence of Annealing on Structural Relaxation, Crystallization, and Deformation Behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic Glass", J. Mater. Res. 22, 1849 (2007)
  K.S. Lee, J. Eckert, H.-J. Jun, Y.W. Chang
  
• "Load Relaxation Behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic Glass", J. Non-Cryst. Solids 353, 2515 (2007)
  K.S. Lee, J. Eckert, Y.W. Chang
  
• "Mechanical Properties of Bulk Metallic Glasses and Composites", J. Mater. Res. 22, 285 (2007)
  J. Eckert, J. Das, S. Pauly, C. Duhamel
  
• "Processing Routes, Microstructure and Mechanical Properties of Metallic Glasses and their Composites", Adv. Eng. Mater. 9, 443 (2007)
  J. Eckert, J. Das, S. Pauly, C. Duhamel
  
• "Structural Relaxation and Crystallization of a Zr44Ti11Cu9.8Ni10.2Be25 Bulk Metallic Glass", Mater. Trans. 48, 1722 (2007)
  K.S. Lee, H.-J. Jun, D.W. Kim, J. Eckert, Y.W. Chang
  
• "EXAFS and Dilatometric Analysis of Structural Rearrangement after Annealing in a Zr-based Bulk Metallic Glass", Rev. Adv. Mater. Sci. 18, 14 (2008)
  K.S. Lee, J. Eckert, Y.W. Chang
  
• "High Temperature Deformation and Formability of Cu47.5Zr47.5Al5 Bulk Metallic Glass", in: "Proc. Int. Conf. on Technology of Plasticity", Gyeongju, Korea, 07.-11.09.2008. The Korean Society for Technology of Plasticity, Seoul, Korea; CD-ROM, S. 570 ff.
  K.S. Lee, H.-J. Jun, Y.W. Chang, J. Eckert, J.H. Lee
  
• "High Temperature Deformation Behavior and Formability of a Cu-Zr-Al-Ni Bulk Metallic Glass", Metall. Mater. Trans. A 39, 1831 (2008)
  H.-J. Jun, K.S. Lee, J. Eckert, Y.W. Chang
  
• "Effect of Crystalline Phases on Deformation and Warm Formability of a Bulk Metallic Glass Composite within Supercooled Liquid Region", Mater. Sci. Eng. A 526, 62 (2009)
  H.-J. Jun, K.S. Lee, U. Kühn, J. Eckert, Y.W. Chang
  
• "On the Structural Relaxation of Bulk Metallic Glass under Warm Deformation", Intermetallics 17, 222 (2009)
  K.S. Lee, J.-H. Lee, J. Eckert
  
• "Thermomechanical Characterization of Cu47.5Zr47.5Al5 Bulk Metallic Glass within the Homogeneous Flow Regime", Intermetallics 17, 65 (2009)
  K.S. Lee, H.-J. Jun, S. Pauly, B. Bartusch, Y.W. Chang, J. Eckert