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High-throughput investigations of configurational-transformation-dominated serrations in CuZr/Cu nanolaminates
- Source :
- Journal of Materials Science & Technology. 53:192-199
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Metallic amorphous/crystalline (A/C) nanolaminates exhibit excellent ductility while retaining their high strength. However, the underlying physical mechanisms and the resultant structural changes during plastic deformation still remain unclear. In the present work, the structure-property relationship of CuZr/Cu A/C nanolaminates is established through integrated high-throughput micro-compression tests and molecular dynamics simulations together with high-resolution transmission electron microcopy. The serrated flow of nanolaminates results from the formation of hexagonal-close-packed (HCP)-type stacking faults and twins inside the face-centered-cubic (FCC) Cu nano-grains, the body-centered-cubic (BCC)-type ordering at their grain boundaries, and the crystallization of the amorphous CuZr layers. The serration behavior of CuZr/Cu A/C nanolaminates is determined by several factors, including the formation of dense dislocation networks from the multiplication of initial dislocations that formed after yielding, weak-spots-related configurational-transitions and shear-transition-zone activities, and deformation-induced devitrification. The present work provides an insight into the heterogeneous deformation mechanism of A/C nanolaminates at the atomic scale, and mechanistic base for the microstructural design of self-toughening metallic-glass (MG)-based composites and A/C nanolaminates.
- Subjects :
- Amorphous metal
Materials science
Polymers and Plastics
Mechanical Engineering
Metals and Alloys
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Amorphous solid
Serration
Devitrification
Deformation mechanism
Mechanics of Materials
Materials Chemistry
Ceramics and Composites
Grain boundary
Dislocation
Composite material
0210 nano-technology
Ductility
Subjects
Details
- ISSN :
- 10050302
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science & Technology
- Accession number :
- edsair.doi...........fc06ee4cb5e3274f0844e640509bf971