The relation of high-temperature stability of amorphous alloys with nucleation and growth of the crystalline phases

Khar'kov, E.I.; Lysov, V. I.; Ishchenko, A. M.

doi:10.1016/0022-3093(90)90924-b

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…The embrittlement is thus caused by the segregation of phosphorus in separate regions that are less ductile than the matrix and are acting as nucleation sites 58 . However, since the driving force for crystallization during annealing is higher than that for the crystallization upon quenching, the phase separation and nanocrystallization happens quite fast and the sizes of these regions are one to two orders of magnitude larger compared to the nanocrystals formed upon quenching in our case (1 − 1.5 nm) 59 , 60 . Hence, the structural relaxation and phase separation dominates over the ductile FCC crystals formed during quenching, which probably leads to the early failure in the annealed BMGs.…”

Section: Discussionmentioning

confidence: 57%

Origin of large plasticity and multiscale effects in iron-based metallic glasses

et al. 2018

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The large plasticity observed in newly developed monolithic bulk metallic glasses under quasi-static compression raises a question about the contribution of atomic scale effects. Here, nanocrystals on the order of 1–1.5 nm in size are observed within an Fe-based bulk metallic glass using aberration-corrected high-resolution transmission electron microscopy (HRTEM). The accumulation of nanocrystals is linked to the presence of hard and soft zones, which is connected to the micro-scale hardness and elastic modulus confirmed by nanoindentation. Furthermore, we performed systematic simulations of HRTEM images at varying sample thicknesses, and established a theoretical model for the estimation of the shear transformation zone size. The findings suggest that the main mechanism behind the formation of softer regions are the homogenously dispersed nanocrystals, which are responsible for the start and stop mechanism of shear transformation zones and hence, play a key role in the enhancement of mechanical properties.

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Section: Discussionmentioning

confidence: 57%

Origin of large plasticity and multiscale effects in iron-based metallic glasses

et al. 2018

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Phase separation in metallic glasses

Kim

Park

et al. 2013

Progress in Materials Science

233

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Fe-based bulk metallic glass with high plasticity

Yao¹,

Zhang²

2007

Applied Physics Letters

156

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Fe-based bulk metallic glasses usually exhibit very poor ductility (<0.5%), which has limited their applications. Here the authors report an Fe-based bulk metallic glass which shows a plastic strain of ∼5.2%, together with high strength and distinct strain-hardening characteristics. Its yield strength is ∼2.32GPa, while the ultimate strength is ∼2.80GPa due to the strain-hardening effect. Multiple shear bands and related shear ledges are observed on the deformed specimen. The high plasticity and strain hardening are attributed to the nanoscale inhomogeneity that resulted from liquid phase separation, which can hinder the propagation of shear bands and promote multiple shearing.

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The relation of high-temperature stability of amorphous alloys with nucleation and growth of the crystalline phases

Cited by 4 publications

References 2 publications

Origin of large plasticity and multiscale effects in iron-based metallic glasses

Origin of large plasticity and multiscale effects in iron-based metallic glasses

Phase separation in metallic glasses

Fe-based bulk metallic glass with high plasticity

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