Shear band evolution and deformation mechanism in bulk metallic glasses

2009 Fiscal Year Final Research Report

• Project/Area Number: 20860011
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Structural/Functional materials
• Research Institution: Tohoku University
• Principal Investigator: LIU Yanghui Tohoku University, 金属材料研究所, COEフェロー (70506469)
• Project Period (FY): 2008 – 2009
• Keywords: 金属ガラス / MEMS

Research Abstract

In this work, we derive a universal scaling law, τ_y=3R・(T_g-RT)/V, that uncovers an inherent relationship of yield strength τ_y with glass transition temperature T_g, molar volume V of metallic glasses and RT the room temperature. This equation is derived from fundamental thermodynamics and validated by various metallic glasses with well-defined yielding. The linearity between τ_y and T_g demonstrates that yielding of metallic glasses is correlated intrinsically with glass-liquid transition instead of melting.

Research Products

• [Journal Article] Energetic criterion on the intrinsic ductility of bulk metallic glasses (2010)
  • Author(s): Y. H. Liu, K. Wang, A. Inoue, T. Sakurai, M. W. Chen
  • Journal Title: Scripta Materialia 62 Pages: 586-589
  • Peer Reviewed
• [Journal Article] Thermodynamic Origins of Shear Band Formation and the Universal Scaling Law of Metallic Glass Strength (2009)
  • Author(s): Y. H. Liu, C. T. Liu, W. H. Wang, A. Inoue, T. Sakurai, M. W. Chen
  • Journal Title: PHYSICAL REVIEW LETTERS 103 Pages: 065504
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): Y. H. Liu, K. Wang, D Pan, Hao Wang, K. Nakayama, A. Inoue, W. H. Wang, M. W. Chen
  • Journal Title: Plastic Deformation-Assisted Synthesis of Metallic Glass Nanostructures 50 Pages: 1890
  • Peer Reviewed
• [Presentation] Mechanical behavior of microsized metallic glasses (2009)
  • Author(s): Y. H. Liu, M. W. Chen
  • Organizer: The Third International Conference on the Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials
  • Place of Presentation: Kurashiki, Japan
  • Year and Date: 2009-09-06