| 1. |
- Okulov, I. V., et al.
(author)
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Flash Joule heating for ductilization of metallic glasses
- 2015
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 6
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Journal article (peer-reviewed)abstract
- Metallic glasses (MGs) inherit their amorphous structure from the liquid state, which predetermines their ability to withstand high loads approaching the theoretical limit. However, the absence of slip systems makes them very sensitive to the type of loading and extremely brittle in tension. The latter can be improved by precipitation of ductile crystals, which suppress a catastrophic propagation of shear bands in a glassy matrix. Here we report a novel approach to obtain MG-matrix composites with tensile ductility by flash Joule heating applied to Cu(47.5)Zr(47.)5Al(5) (at.%) metallic glass. This homogeneous, volumetric and controllable rapid heat treatment allows achieving uniformly distributed metastable B2 CuZr crystals in the glassy matrix. It results in a significant tensile strain of 6.8 +/- 0.5%. Moreover, optimized adjustment of the heat-treatment conditions enables tuning of microstructure to achieve desired mechanical properties.
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| 2. |
- Kaban, I., et al.
(author)
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Atomic structure and formation of CuZrAl bulk metallic glasses and composites
- 2015
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In: Acta Materialia. - : Elsevier BV. - 1359-6454 .- 1873-2453. ; 100, s. 369-376
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Journal article (peer-reviewed)abstract
- Cu47.5Zr47.5Al5 metallic glass is studied experimentally by high-energy X-ray diffraction, neutron diffraction with isotopic substitution, electron diffraction and X-ray absorption spectroscopy. The atomic structure of the glass is modeled by reverse Monte-Carlo and molecular dynamics simulations. RMC modeling of seven experimental datasets enabled reliable separation of all partial pair distribution functions for Cu47.5Zr47.5Al5 metallic glass. A peculiar structural feature of the ternary alloy is formation of the strong Al-Zr bonds, which are supposed to determine its high viscosity and enhanced bulk glass formation. Analysis of the local atomic order in Cu47.5Zr47.5Al5 glass and Cu10Zr7, CuZr2 and CuZr B2 crystalline structures elucidates their similarities and differences explaining the phase formation sequence by devitrification of the glass.
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| 3. |
- Kaban, I., et al.
(author)
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Experimental and RMC simulation study of liquid Cu6Sn5
- 2007
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In: Journal of Non-Crystalline Solids. - : Elsevier BV. - 0022-3093 .- 1873-4812. ; 353:32-40, s. 3027-3031
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Journal article (peer-reviewed)abstract
- The atomic structure of liquid Cu6Sn5 alloy at 640 degrees C has been investigated with neutron and X-ray diffraction. The experimental structure factors were used to perform computer modeling with the reverse Monte Carlo method. Three different series of simulations were carried out. It has been established that the partial structure factors modeled by combining the experimental data of the two independent measurements (XRD and ND) are reliable, while those modeled with only one set of the experimental data (XRD or ND) exhibit some non-physical features.
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