Early Stages of Mechanical Crystallization of Amorphous Fe86Zr7B6Cu1 Soft Magnetic Material: The Role of Shear Bands

Friedrich, J.; Herr, U.; Samwer, K.

doi:10.1002/1521-396x(200202)189:3<897::aid-pssa897>3.0.co;2-8

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…[19][20][21] Further, it is known that the copper type texture that we observe in YSZ occurs in certain fcc metals after cold deformation. It is thought that this texture is at least partly due to slipping of crystal planes and crystallite rotation during deformation.…”

supporting

confidence: 84%

Oblique ion texturing of yttria-stabilized zirconia: the {211}〈111〉 structure

Berdahl

Reade

Liu

et al. 2003

Applied Physics Letters

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Amorphous (Zr,Y)Ox films were synthesized by reactive magnetron sputtering and subsequently crystallized by oblique ion bombardment. Crystalline texture nucleated by the ion beam was replicated by solid-phase epitaxial growth throughout the formerly amorphous yttria-stabilized zirconia (YSZ) film. The resulting YSZ films have (211) orientation normal to the substrate with in-plane directions (111), parallel, and (110), transverse, to the azimuth of the ion beam. We hypothesize that the texture mechanism involves ion-induced film compression and shear. The results, taken together with prior work, show that oblique ion texturing of amorphous films is a general phenomenon that can be used to fabricate substrates with more than one type of crystallographic orientation.

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supporting

confidence: 84%

Oblique ion texturing of yttria-stabilized zirconia: the {211}〈111〉 structure

Berdahl

Reade

Liu

et al. 2003

Applied Physics Letters

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“…ratio of plate thickness H to radius of curvature R), the shear-band spacing l decreases as u increases. The shear-band density, r SB , [82][83][84] defined as the reciprocal of l, thus increases. Many studies suggest that such multiple shear banding would mean improved plasticity 85,86 since shear is more uniformly distributed.…”

Section: Compositionmentioning

confidence: 99%

“…High values of r SB , generated through severe mechanical treatment, e.g. cold drawing, [87][88][89] cold rolling 82,83,[90][91][92] and shot-peening, 86 do impart greater plasticity.…”

Section: Compositionmentioning

confidence: 99%

Inverse ductile–brittle transition in metallic glasses?

Sun¹

2015

Materials Science and Technology

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There is evidence that metallic glasses can show increased plasticity as the temperature is lowered. This behaviour is the opposite to what would be expected from phenomena such as the ductile-brittle transition in conventional alloys. Data collected for the plasticity of different metallic-glass compositions tested at room temperature and below, and at strain rates from rate 10 25 to 10 3 s 21 , are reviewed. The analogous effects of low temperature and high strain rate, as observed in conventional alloys, are examined for metallic glasses. The relevant plastic flow in metallic glasses is inhomogeneous, sharply localised in thin shear bands. The enhanced plasticity at lower temperature is attributed principally to a transition from shear on a single dominant band to shear on multiple bands. The origins of this transition and its links to shear bands operating 'hot' or 'cold' are explored. The stress drop on a shear band after initial yielding is found to be a useful parameter for analysing mechanical behaviour. Schematic failure mode maps are proposed for metallic glasses under compression and tension. Outstanding issues are identified, and design rules are considered for metallic glasses of improved plasticity.

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