Transition from homogeneous-like to shear-band deformation in nanolayered crystalline Cu/amorphous Cu–Zr micropillars: Intrinsic vs. extrinsic size effect

Evolution of crystallite size, lattice parameter and internal strain in Al precipitates during high energy ball milling of partly amorphous Al87Ni8La5 alloy

“…For the sake of simplicity, it will be assumed that the deformation of the particle proceeds in a straight direction, i.e., the shear deformation penetrates the crystallite as shown in Ref. [40]. Similar to the glassy matrix, the deformation will cause a local increase in temperature in the Al precipitates near the shear deformation zone which allows the Ni atoms to diffuse from the amorphous matrix into the shear deformed zone of the precipitate leading to local saturation of the Al-lattice in Ni within the precipitate.With increasing ball milling time the crystallite size decreases due to the increasing number of particle shear processes.…”

Size- and constituent-dependent deformation mechanisms and strain rate sensitivity in nanolaminated crystalline Cu/amorphous Cu–Zr films

“…As a result, the STZs and their groups may self-organize into a network rather than into a SB. In the amorphous nanolayers and single layer films under constraint conditions and/or at extremely small length scales [10,11,13,17,20,24], shear banding becomes so unfavorable that it subsides altogether, giving way to spread-out STZ actions that lead to a homogeneous-like flow [55]. In the amorphous nanolayers especially, although the SBs can form via activation of the STZs eventually, they cannot easily propagate due to the strong constraint effects of the Cu nanolayers [17].…”

“…Engineering MGs with crystalline phases can effectively improve the ductility and simultaneously retain their high strength, as observed in crystalline/amorphous nanolaminates (C/A NLs) [9][10][11][12][13] and MG-based composites [14][15][16][17][18]. The underlying mechanism for this is that the ductile crystalline phases suppress the SBs and hence exert a constraint effect on MG fracture.…”

“…This constraint effect should be especially prominent in the C/A NLs, where each amorphous nanolayer is sandwiched and highly constrained by two adjacent crystalline nanolayers. Experimentally, Cu/Cu-Zr C/A NL micropillars have been found [17,19] to display a large deformability of > 20% and simultaneously a high strength of > 1. 5 GPa under uniaxial compression.…”

Influence of Y2O3-SiC-Mo and Ce-Al-Ni amorphous alloy on laser melting deposition stellite matrix composites

“…It is known that a series of amorphous alloys have high glass forming ability in Si, Fe, Zr and Y based alloy systems [18][19][20][21]. Thus, it was speculated that a lot of amorphous phases were able to be produced in such LMD coating.…”