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1
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Fabrication and Characterization of Tensile Deformation of Tin-Lead Open Cell Foams

100%
Belhadj A., Azzaz M., Abudura S.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
615-618
EN
This study is devoted to the investigation of metallic foams based on tin-lead alloy (with 50% of tin content) by the liquid metal infiltration process. Uniaxial tensile tests were performed at room temperature in order to study mechanical properties of foams of different relative density and cell size. The samples were concurrently characterized on a microscopic scale (metallography and hardness) in order to link the morphological and mechanical characteristics of the constitutive phases.
2
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Anelastic Phenomena in Mg-Al Alloys

100%
Nagarajan D., Caceres C., Griffiths J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
501-504
EN
Cyclic loading-unloading in tension and compression has been used to quantify the anelastic behaviour, in the form of hysteresis loops, of pure Mg and three Mg-Al alloys (0.5, 2, and 9 at.% Al). The effect reached a maximum at a plastic strain of ≈ 0.02 for all of the materials, and decreased at higher strains. The amount of anelasticity at any given strain was smaller for the dilute alloys in comparison with the pure Mg whereas it increased above that of pure Mg for the most concentrated alloy. Possible reasons for this behaviour are discussed in terms of reversible twinning, solid solution softening, and hardening and short range order.
3
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Acoustoelectrical Relaxation in GaAs by the Formation and the Recovery of Metastable EL2

100%
Ertel J., Brion H., Haasen P.
Acta Physica Polonica A
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1993
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vol. 83
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issue 1
11-23
EN
The transformations between the normal and metastable state of EL2 in GaAs are investigated. We apply the internal friction technique as a probe for very small conductivities and discuss the changes in conductivity by the formation and recovery of EL2*. At 40 K both shallow acceptors and EL2 are photoquenched into neutral metastable states. The acceptors are likely to be associated with EL2* forming an electrically inactive state. We identify two damping peaks at 60 and 95 K with the regeneration of the acceptors and EL2 respectively. The latter indicates a regeneration via the charged defect (EL2)^{+}.
4
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Effect of Compressive Load on Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal

100%
Richterová K., Drahokoupil J., Kopecký V., Dragounová K., Landa M., Heczko O.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
704-708
EN
We investigated the effect of large compressive stress on magnetic shape memory effect in modulated 10M martensite of Ni-Mn-Ga Heusler alloy. The single crystalline sample deformed approximately elastically up to highest load 540 MPa. Structural and microstructural changes of a single crystal were analysed by X-ray diffraction 2D scan mapping in 2θ and ω. Although the crystal structure, lattice cell parameters, and twinned microstructure (a/b and modulation twinning) exhibited only small changes after the loading, the volume of the sample undergoing the magnetically induced reorientation decreased sharply while magnetic field necessary for the reorientation gradually increased. The extrapolation suggested that no magnetically induced reorientation might occur after compression of about 1 GPa.
5
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The Internal Friction and the Relaxation Time Spectrum of Ferroelectric Ceramic PZT Type

100%
Bartkowska J., Ilczuk J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-7-A-13
EN
The fractional Zener model with two spring-pots is proposed to description of relaxation time spectrum of ferroelectric ceramic material. This model is based on fractional calculus. The influence of values of a and b parameters on the shape of the relaxation time spectrum was investigated.
6
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Surface Treatment Effect on Bulk Magnetoelastic Properties of High Damping Fe-Based Alloys

100%
Chudakov I., Udovenko V.
Acta Physica Polonica A
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1996
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vol. 89
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issue 3
425-430
EN
Binary and complex alloyed high damping steels on the base of Fe-Cr and Fe-Al systems was investigated. It was shown that already slight surface treatment leads to the increase in magnetic anisotropy of the material and to the decrease in damping capacity.
7
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Acousto-Optic Tunable Filters for Imaging Applications in the 2-4~μm with Low RF Drive Power

100%
Valle S., Ward J., Pannell C., Johnson N.
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EN
The λ^{2} dependence on acoustic field intensity (and hence RF drive power) can render large aperture acousto-optic tunable filters impractical for many applications beyond about 2 μm. One potential technique for reducing the RF drive-power requirement is to configure an acousto-optic tunable filter such that the interaction region is at acoustic resonance. We describe an acousto-optic tunable filter that operates at resonance and present an analysis of the predicted performance. In addition, we address the practical issues in deploying such a scheme. Finally, we present results of a prototype "resonant acousto-optic tunable filter" operating in the 1-2 μm region.
8
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Controlling Mechanisms of Creep Deformation of New Air-Hardenable TiAl-Based Alloy

88%
Staneková H., Lapin J., Pelachová T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
512-515
EN
In the present work, controlling mechanisms of creep deformation of a new cast air-hardenable Ti-46Al-8Ta [at.%] alloy was studied. Long-term constant load tensile creep tests combined with an abrupt change of the applied stress were performed at 700°C. The response of the alloy to a stress reduction is analyzed. Transient behaviour with zero creep before recommencing creep at a reduced load is related to possible creep deformation mechanisms. The dislocation microstructures are analysed for creep strains corresponding to the minimum creep rate by transmission electron microscopy. The controlling mechanisms of creep deformation are identified from the transient creep behaviour of the alloy during stress reduction, the stress exponent and dislocation microstructures observed after creep testing.
9
Content available remote

Mechanical Properties of Aluminum-Matrix-Nanoparticle Composites

63%
Kazakewitsch A., Riehemann W.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
516-519
EN
Aluminum-matrix-nanoparticle composites were produced by ball milling of micro scale aluminum powder with different additions of 500 nm mean diameter SiC particles in air atmosphere with subsequent consolidation by hot extrusion. The material was investigated in this condition by tensile testing, hot tensile testing, density, hardness, and amplitude dependent damping measurements. The amplitude dependent damping of the material was investigated after slow furnace heating and cooling as after quenching into water to the room temperature. The results of the tensile and hot tensile testing show that the addition of SiC particles lead to a significant increase of tensile strength, but the remaining porosity increased, too. The results obtained for the amplitude dependent damping can be attributed to cracks present in the consolidated material or cracks produced by thermal stresses.
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