Plasticity of laser-processed nanoscale Al Al2Cu eutectic alloy

Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

“…The geometrical conditions for slip transition across the interface, including an angular limit between the Burgers vectors of two adjacent phases of < 60°and for the angle between the slip traces with the interface of < 15°, are satisfied [34]. Evidence of sheared particles having different lattice structure and slip systems from those of the matrix, were reported for semi-coherent precipitate in an Al-Cu-Mg-Ag alloy [35] and for θ -Al 2 Cu nanolayers in an Al matrix [36]. Shearing of nearly 1 μm size plate-like θ -Al 2 Cu was also reported due to the dislocations pile-up at particle/matrix interface in Al-2.5Cu alloy when operation of the Orowan mechanism was restricted [37].…”

Achieving room-temperature brittle-to-ductile transition in ultrafine layered Fe-Al alloys

“…One approach to improving the mechanical properties of Fe-Al alloys is to "complicate" their internal microstructure by introducing a high density of biphase interfaces (16)(17)(18)(19)(20)(21). Deformation response is highly sensitive to the modes of dislocation slip activated within the crystals when strained.…”

Mechanical behavior of nanocomposites

“…Interfaces that favor slip transmission in disparate phases Plastic co-deformability in high-strength metal-intermetallic 36 and metal-metallic glass systems [9][10][11] interfaces in Cu-Nb and related systems exhibit unusual behavior (e.g., very high cohesive strength but relatively low shear strength in the interface plane), which leads to localized shear in response to impinging glide dislocations and trapping of dislocations in the interface plane with delocalized (spread) core 5 (Figure 1a-b). This also results in a very high interface barrier to slip transmission that can be tailored via design of the interface atomic structure to influence the interface shear strength.…”

“…[28][29][30][31][32][33] The defect structure of interphase boundaries at the atomic scale has been shown to correlate with nucleation of glide dislocations and deformation twinning that is relevant to controlling the "twinnability" of interfaces under shock 34 and severe plastic deformation. 25,35 Finally, the morphology of the interfaces in nanocomposites has been shown to be effective in controlling plastic deformability-bicontinuous, intertwined nanocomposites seem to suppress shear localization better than nanolaminates, 36 and hierarchical morphologies can lead to plastic co-deformability in nanocomposites with soft/ hard phases. 36…”

“…25,35 Finally, the morphology of the interfaces in nanocomposites has been shown to be effective in controlling plastic deformability-bicontinuous, intertwined nanocomposites seem to suppress shear localization better than nanolaminates, 36 and hierarchical morphologies can lead to plastic co-deformability in nanocomposites with soft/ hard phases. 36…”