Loading...

On the origin of intermediate temperature brittleness in La-based bulk metallic glasses

Asadi Khanouki, M. T ; Sharif University of Technology | 2019

563 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2018.08.131
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. The effect of strain rate on the ductility of a La-based bulk metallic glass (BMG) over a wide temperature range, and the correlation between ductility and relaxation processes within this alloy are investigated in the present work. The three point bending test and dynamic mechanical analysis are employed to study these phenomena. It is found that the activation energies of the nearly constant loss (NCL) relaxation and intermediate temperature brittleness are almost identical. This observation reveals that the NCL relaxation, as a locally confined or caged dynamics, contributes as the main source of intermediate temperature brittleness in La-based BMGs. © 2018 Elsevier B.V
  6. Keywords:
  7. Bulk metallic glass ; Ductility ; Nearly constant loss ; Relaxation ; Shear bands ; Activation energy ; Brittleness ; Fracture mechanics ; Glass ; Plasticity ; Steam turbines ; Strain rate ; Effect of strain ; Intermediate temperatures ; Three-point bending test ; Wide temperature ranges ; Metallic glass
  8. Source: Journal of Alloys and Compounds ; Volume 770 , 2019 , Pages 535-539 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838818330226