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Orava, J.
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Publications (9/9 displayed)
- 2020Stimulation of shear-transformation zones in metallic glasses by cryogenic thermal cyclingcitations
- 2020Rejuvenation through plastic deformation of a La-based metallic glass measured by fast-scanning calorimetry
- 2019Fast-heating-induced formation of metallic-glass/crystal composites with enhanced plasticity
- 2018On cryothermal cycling as a method for inducing structural changes in metallic glassescitations
- 2016Fast crystal growth in glass-forming liquids
- 2016Viscosity of liquid Ag-In-Sb-Te: Evidence of a fragile-to-strong crossover.
- 2015Fragile-to-Strong Crossover in Supercooled Liquid Ag-In-Sb-Te Studied by Ultrafast Calorimetry
- 2011Chalcogenide glasses - carbon nanotube composite
- 2010Carbon nanotube-chalcogenide compositecitations
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article
Stimulation of shear-transformation zones in metallic glasses by cryogenic thermal cycling
Abstract
Cryogenic thermal cycling (CTC, between room temperature and 77 K) of a (Cu,Zr)-based bulk metallic glass(MG) leads to substantial reductions in the initial yield loadFyobserved on instrumented indentation, and canreverse annealing-induced increases inFy. In contrast, for hardness and elastic modulus, CTC has much less effectand can only partially reverse annealing effects. The distribution ofFyvalues is wide, reflecting heterogeneity inthe MG. For a melt-spun Fe-based glass, CTC with more cycles induces similar changes inFy, and has almost noeffect on the magnetic properties. Such differing effects of CTC can be consistently interpreted in terms of itspreferential effect onsoft spotsin a relatively rigid glass matrix. The capability for targeted stimulation ofshear-transformation zonespermits tailoring of MG properties, clearly facilitates initiation of plasticflow, and offers theprospect of improved plasticity and toughness even in annealed samples.