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1
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Some Aspects of Shear Yielding and Emergence of Shear Bands in Solid Polymers

100%
Dobovšek I.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
619-623
EN
In this work, we first recapitulate experimental findings under different testing conditions available in the literature. Next, we establish a theoretical framework for the analysis of evolution of deformation into a highly localized pattern, where the theoretical approach with necessary adjustments to accommodate the constitutive behaviour of the solid polymer is applied in the course of development. A detailed theoretical analysis of critical stress conditions required for shear band initiation shows that in order to predict the material instability in accordance with experimental findings it is necessary to introduce a multi-parameter type of constitutive relation.
2
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Zr, ZrN and Zr/Al Thin Films Deposition Using Arc Evaporation and Annealing

100%
Čyvienė J., Dudonis J.
Acta Physica Polonica A
|
2008
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vol. 114
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issue 4
769-777
EN
The chemical reactions are widely used for the layers of different composition formation. However, synthesis mechanism is a complicated process in thin films/layers system, and is not completely studied. The purpose of this paper was to analyze the kinetics of chemical compounds in reaction, to produce ZrO₂ thin films using arc evaporation and annealing (post-deposition), and to analyze them. The pure zirconium (Zr) and zirconium nitride (ZrN) were deposited using arc evaporation. 10% mol of aluminum was evaporated on a few Zr films. All deposited films were annealed in the air atmosphere gradually changing the temperature from 400°C to 1100°C in order to produce ZrO₂ films. The formation processes of the new phase were studied. Activation energy of the reactions was calculated. Structural properties were measured using X-ray diffraction, optical properties - using ellipsometry. Tetragonal phase of ZrO₂ was obtained in the annealing process of ZrO₂/Al thin film in the air atmosphere of 800°C.
3
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Production of Mg-3Al Based Composites Reinforced with Ti6Al4V Particles

100%
Kumruoglu L.
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vol. 125
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issue 2
432-434
EN
Stir casting is one of the simple, flexible and the cost effective methods for fabricating of metal matrix composites reinforced with particles. In this study, 5%, 10%, 15 vol.% Ti6Al4V particles were added into the Mg-3Al melt during stirring. The tensile strength of Mg-3Al alloy was between 150-190 MPa and 5 vol.% Ti6Al4V/Mg-3Al alloy was equal. However, increasing the particle volume of Ti6Al4V powders to 10 vol.% and 15 vol.% decreased the ultimate tensile strength of composites to 140-170 MPa and 90-110 MPa, respectively. On the other hand, the hardness of reinforced composite was increased for each volume.
4
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Ordering and Magnetoelastic Properties of Fe-Ga Alloy

88%
Perduta K., Olszewski J., Busbridge S., Nabiałek M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1537-1543
EN
In this paper the investigations of the ordering, microstructure and magnetomechanical properties of the Fe_{80}Ga_{20} alloy and its composites are presented. The composites consisted of the Fe-Ga particles with a size distribution in the range between 20 and 50 μm. These particles were produced by blade-milling of arc-melted alloy. After milling the powders were annealed at 723 K for 2.5, 7.5, and 12.5 h. The epoxy-bonded composites in rectangular shape were made from the as-cast as well as from the annealed powders. The Mössbauer spectroscopy studies revealed that the as-cast alloy is completely disordered. After annealing at 723 K the long range atomic order appeared. It was stated that the best magnetoelastic properties were exhibited by composites made from ferromagnetic particles obtained from the as-cast alloy. The measured saturation magnetostriction was λ_s= 70× 10^{-6} for the bulk alloy and λ_s=100× 10^{-6} for composite.
5
Content available remote

Production of Aluminum Glass Fiber Reinforced Foam Synthesized by Space-Holder Technique

88%
Ertürk A.
Acta Physica Polonica A
|
2016
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vol. 129
|
issue 4
592-595
EN
Aluminum and its reinforced type with glass fiber composite foams were produced by powder sintering process using spherical carbamide particles as a space holder. The foams with 40-60 vol.% porosity fractions were successfully produced after water leaching and sintering methods. Compression test was performed on both of the foam samples for comparing the compressive properties and energy absorption behavior of them. The composite foam samples with glass fiber reinforcement showed higher compressive strength than the parent material foam.
6
Content available remote

Quasicrystal-Polymer Composites for Additive Manufacturing Technology

75%
Kenzari S., Bonina D., Degiovanni A., Dubois J., Fournée V.
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vol. 126
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issue 2
449-452
EN
We present a new niche application of quasicrystalline powders that leads to a commercially successful development of polymer-matrix composites. The process is based upon selective laser sintering, which is one of the current most powerful additive manufacturing technologies in use in the mechanical industries. Characteristics of the materials produced, such as porosity, friction and wear against hard steel, are evaluated and compared to the state of the art. Insight into the production of metal-matrix composites, using a variant of the technology, is also given.
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