Plastic deformation of Al85Ni10La5 by equal channel angular pressing

Change in atomic coordination in a heavily deformed metallic glass

“…Above T g , the alloy behaves like a liquid and within a short time the material approaches its structural equilibrium followed by a quench to the matrix temperature during which the structure is frozen-in. 18 This interpretation is supported by the results of Zhao and Li 46 who determined the temperature increase in alloy Zr 41.25 Ti 13.75 Ni 10 Cu 12.5 Ni 22.5 (commercial name Vitreloy 1) by finite element calculations and found that the strain rate notably affects local heating. They also found that compression causes a higher temperature increase than tension.…”

“…The displacement of Al atoms may lead to their agglomeration between the clusters, which finally results in nucleation and growth of Al-crystals with size of the order of 10 nm as reported previously. 18,23 Investigation of the structure of heavily deformed and amorphized Ni-Nb-Y alloy with "solute-solvent" short range order shows grainy structure with grain size $20 nm. 49 Changes in coordination number have also been reported by Cao et al 50 who observed by MD simulation a reduction of Z around Cu from 12 to 9 within the shear bands of plastically deformed Cu-Zr metallic glass.…”

“…11,14,15 The mechanism by which crystallization in shear bands occurs is still under discussion. 5 Athermal, 11,16 thermal, 17 or combined athermal and thermal mechanisms 18 have been suggested to explain the formation of nanocrystals in shear bands during plastic deformation. Despite an appreciable amount of work on the structure of shear bands has been done, the mechanisms of plastic deformation are still not understood in detail.…”

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

“…Structural analyses of Al-based MG after severe plastic deformation using different deformation techniques like cold rolling [3], high pressure torsion [4], equal channel angular pressing [5] and ball milling have been performed revealing the formation of fcc-Al nanoprecipitates in or close to shear bands. Only qualitative correlations between the degree of deformation and the structural changes were, however, found.…”

Effect of laser shock peening on mechanical properties of Zr-based bulk metallic glass

“…(1)By optimizing internal material micro-structures, for example, designing new alloy compositions through introducing second phases into BMGs [12,13,14,15]. (2)By introducing external mechanical treatments which promoting the formation of multiple shear bands [3,16,17,18,19]. One of the most common treatments is shot peening(SP) which induces compressive residual stresses and enhances the M a n u s c r i p t nucleation of shear bands near the surface.…”