Interaction of deformation shear bands with nanoparticles in amorphous-nanocrystalline alloys

Amorphous-Nanocrystalline Composites Prepared by High-Pressure Torsion

“…In composites, an increase in the degree of deformation increases the volume fraction of the nanocrystalline phase and decreases the nanocrystal size ( Figure 6). Because of the small size of the nanocrystals formed upon HPT, the priority mechanisms of their interaction with SB (in accordance with the classification proposed in earlier works [39,40]) are suggested to be the "absorption" mechanism, at which moving SB absorbs nanoparticles without changing the motion path in the amorphous matrix ( Figure 5a), and the "accommodation" mechanism, at which meeting of SB with an elastically stressed nanocrystal initiates the exit of one or several secondary SB to the amorphous matrix ( Figure 5b).…”

Crystallization behavior of Fe- and Co-based bulk metallic glasses and their glass-forming ability

“…1 cm) in each spatial dimension. After general saturation of the research activities in the field of conventional crystalline alloys since the end of the past century [6] bulk metallic glasses and glassy-crystal dual phase materials [7,8], owing to their good mechanical, chemical, magnetic and other properties, are at the research frontier among metallic materials.…”

Balancing strength and toughness of calcium-silicate-hydrate via random nanovoids and particle inclusions: Atomistic modeling and statistical analysis

“…We studied the effect of random nanovoids and particle inclusions on balancing mechanical properties (strength, stiffness and toughness) of a complex cementitious phase, calcium-silicate- (Scheyvaerts, Pardoen et al 2009, Glezer, Shurygina et al 2013, providing evidence that complex macroscale brittle materials such as C-S-H may exhibit ductile fracture mechanisms at the nanoscale.…”

“…After that, the stress will increase from 6.0 GPa to its fracture strength of 6.8 GPa. This is attributed to an important toughening mechanism of accommodation, as identified in nanocrystalline alloys (Glezer, Shurygina et al 2013). The accommodation mechanism is referred to a phenomenon that a shear band touches a nanoparticles and induces very high elastic stresses in it; then these stresses initiate new shear bands from the edge of nearby particles.…”

“…However, going beyond C-S-H and portlandite, analogous interactions of nanoparticles (Jalilvand and Shahsavari 2015) and shear band in amorphous alloy (Hufnagel, Fan et al 2002, Kim, Choi et al 2002, Lewandowski and Greer 2006 has been reported. Mechanisms of absorption, bypassing, cutting, retardation and accommodation were identified experimentally (Glezer, Shurygina et al 2013). Therefore, an in-depth understanding of portlandite and its interaction with crack tip in C-S-H at nanoscale is very important, and may lead to a better control and tailor the mechanical properties of cement paste and thus concrete properties.…”