1. Estimation of shear-banding resistance in metallic glass containing nano-crystalline particles
- Author
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Ryosuke Matsumoto, Noriyuki Miyazaki, and Naoki Matsumoto
- Subjects
Materials science ,Amorphous metal ,Nano composites ,Metallurgy ,Amorphous metals, metallic glasses ,Plasticity ,Molecular dynamics ,Nano-composites ,Condensed Matter Physics ,Homogeneous distribution ,Crystalline particle ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Soft Condensed Matter ,Condensed Matter::Materials Science ,Fracture ,Shear (geology) ,Materials Chemistry ,Ceramics and Composites ,Strength ,Composite material ,Nano crystalline - Abstract
Bulk metallic glasses (BMGs) have a variety of excellent properties compared with the majority of conventional crystalline alloys. However, they exhibit limited global plasticity at room temperature because of shear banding. Several methods have been proposed to improve the limited ductility of BMG; one method is the homogeneous distribution of crystalline particles. However, our understanding of the interaction between the crystalline particles and shear bands (SB) is not sufficient. Here, we performed molecular dynamics (MD) simulations of mode II deformation of a notched BMG plate and BMG plates containing one nano-crystalline particle ahead of the notch bottom. To compare the effect of crystalline particle size on the resistance to SB propagation, we used the J-integral. By comparing J–R curves and the deformation behavior of the BMG plates with and without nano-crystalline particles, we found that the resistance to shear banding is efficiently improved by introducing crystalline particles with sufficient size, compared to the SB width.
- Published
- 2009