Atomic picture of elastic deformation in a metallic glass
- Zhejiang Univ., Hangzhou (People's Republic of China)
- Univ. of Missouri-Kansas City, Kansas City, MO (United States)
- George Mason Univ., Fairfax, VA (United States)
- Univ. of Alberta, Edmonton, AB (Canada)
The tensile behavior of a Ni₆₀Nb₄₀ metallic glass (MG) has been studied by using ab initio density functional theory (DFT) calculation with a large cell containing 1024 atoms (614 Ni and 410 Nb). We provide insight into how a super elastic limit can be achieved in a MG. Spatially inhomogeneous responses of single atoms and also major polyhedra are found to change greatly with increasing external stress when the strain is over 2%, causing the intrinsically viscoelastic behavior. We uncover the origin of the observed super elastic strain limit under tension (including linear and viscoelastic strains) in small-sized MG samples, mainly caused by inhomogeneous distribution of excess volumes in the form of newly formed subatomic cavities.
- Research Organization:
- University of Missouri-Kansas City, Kansas City, MO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FE0004007
- OSTI ID:
- 1191998
- Journal Information:
- Scientific Reports, Vol. 5, Issue 3; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
First-Principles Calculation
|
book | January 2019 |
Proposed correlation of structure network inherited from producing techniques and deformation behavior for Ni-Ti-Mo metallic glasses via atomistic simulations
|
journal | July 2016 |
Deformation behavior of metallic glasses with shear band like atomic structure: a molecular dynamics study
|
journal | August 2016 |
Thermal expansion of Pd-based metallic glasses by ab initio methods and high energy X-ray diffraction
|
text | January 2017 |
Similar Records
Roles of nanoclusters in shear banding and plastic deformation of bulk metallic glasses
Correlation between relaxations and plastic deformation, and elastic model of flow in metallic glasses and glass-forming liquids