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1
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Structure and Properties of Metals

100%
Kurzydłowski K.
|
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vol. 96
|
issue 1
69-79
EN
Metals are one of the most widely used types of engineering materials. Some of their properties, e.g. elastic constants, can be directly related to the nature of the metallic bonds between the atoms. On the other hand, macro- and microstructural features of metals, such as point defects, dislocations, grain boundaries, and second phase particles, control their yield, flow, and fracture stress. Images of microstructural elements can be obtained by modern imaging techniques. Modern computer aided methods can be further used to obtain a quantitative description of these microstructures. These methods take advantage of the progress made in recent years in the field of image processing, mathematical morphology and quantitative stereology. Quantitative description of the microstructures are used for modeling processes taking place under the action of applied load at a given temperature and test (service) environment. These model considerations can be illustrated on the example of an austenitic stainless steel, which is an important material for power generating and chemical industry. Reports recently published also show that properties of materials can be significantly modified by the effect of free surface. Examples of such situations include environmental effect on the mechanical properties of materials. Data for an austenitic stainless steel is used to discuss contribution of the free surface to the mechanical properties of metals.
2
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Processing Induced Change οf Thermal Transport Properties οf NiTi-Shape Memory Alloy

80%
Gibkes J., Bein B., Pelzl J., Wieck A., Frenzel J., Eggeler G., Delgadillo-Holtfort I., Chirtoc M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-97-A-101
EN
Photothermal radiometry was applied to investigate the influence of a rolling process on the thermal properties of NiTi foils. The thermal diffusivity and thermal effusivity of the foils were determined at room temperature from the frequency variation of the photothermal signals in thermal transmission. Measurements were conducted on unrolled, rolled and thermally annealed samples. The thermal diffusivity and thermal effusivity are found to decrease considerably on rolling which is attributed to the influence of the rolling induced lattice defects.
3
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Photothermal Investigation of Cavitation Wear Protecting NiTi-Coatings

80%
Gibkes J., Bein B., Pelzl J., Wieck A., Glokowski T., Pohl M., Delgadillo-Holtfort I., Chirtoc M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-103-A-107
EN
Photothermal radiometry was applied to investigate the effect of abrasion by cavitation on steel which was supplied with a wear protecting NiTi film. Phase and amplitude data from areas on the sample which where damaged differently by the cavitation effect indicate the appearance of a three layer structure with the cavitation treatment. With cavitational impact the thermal diffusion time of the first layer decreases and an interfacial layer emerges which is identified as a surface region of the steel substrate which has undergone a stress induced transformation from an austenite to a martensite structure.
4
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Influence of Rare Earth Element on the Mechanical Properties of ZE41 Magnesium Alloys Produced by Mechanical Alloying

80%
Sahin O., Haluk Ertsak F., Oztekin K., Ozarslan S.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
289-292
EN
In this work, we have intended to synthesize ZE41 Magnesium alloys having varying content of Ce of 0.3, 0.6 and 0.9 wt.% and to investigate mechanical properties of these alloys. Alloys were produced by mechanical alloying under argon atmosphere. Structural, and mechanical properties of these alloys were investigated by means of XRD, SEM and nanoindenter analysis. From the XRD data it is found that as the Ce content increases, the crystallite size also increases. On the other hand, the hardness of the alloys decreases with the increasing Ce content. Indentation results show that the measured hardness displays a peak load dependence. Load-independent hardness was calculated by Hays-Kendall approach. As a results, it was found that Ce-doping modifies the microstructure and hardness of the alloy.
5
Content available remote

Substructural Strengthening of Medium-Carbon Alloyed Steel with Preliminary Thermomechanical Processing

80%
Kodzhaspirov G., Rudskoy A.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
527-529
EN
Substructural strengthening result in preliminary thermomechanical processing, when applied cold deformation with the combination of post deformation annealing and induction hardening based on the of dislocation structure inheritance effect on the mechanical properties such as torsion static strength has been studied. Final heat treatment with the use of post deformation tempering followed by induction hardening and low temperature tempering demonstrated the highest static torsion strength in consequence of the inheritance of polygonal dislocation substructure of ferrite arised at the proper post deformation annealing temperature at preliminary thermomechanical processing by dislocation structure of austenite formed under followed induction hardening heating and then by dislocation substructure of martensite formed result in following quenching.
6
Content available remote

Elastic shape memory effect in In-Pb alloys in the temperature range 0.48–180 K

61%
Natsik V., Fomenko L., Lubenets S.
Open Physics
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2003
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vol. 1
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issue 2
235-245
EN
Pseudoelasticity caused by pseudotwinning in short-range ordered In-Pb alloys (6, 8 and 11.6 at. % Pb) is studied in the temperature range 0.48–180 K. The mechanical hysteresis parameters, namely, the thermodynamic stress τT which provides the reversibility of plastic deformation and the frictional stress τf which characterizes the resistance offered by crystal lattice and its defects to twin boundaries motion are estimated. It is found that athermal processes determine the reversible deformation: the mechanical parameters τT and τf do not depend on temperature and strain rate. The stress τT increases and the stress τf decreases with increasing Pb content. One of the main conditions of the exhibition of superelasticity is the fulfillment of the inequality τT>τf.
7
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Content available

Positron Annihilation in Steel Burnished by Vibratory Shot Peening

51%
Zaleski R., Zaleski K.
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EN
A series of C45 steel samples was burnished by shot peening with varying time of treatment. The samples were investigated by nondestructive positron annihilation techniques: angular correlations of two-quantum annihilation radiation and positron annihilation lifetime spectroscopy. To determine residual stresses present under burnished surface the same samples were studied by destructive Davidenkov method. Change of absolute value of the weighted average of residual stresses over positron range in the series of the samples is in good agreement with change of S/W ratio obtained by angular correlations of two-quantum annihilation radiation. Both parameters increase during first 10 minutes of shot peening and then stabilize. Positron annihilation lifetime spectra allowed to identify two types of structural defects: smaller ones like vacancies or dislocations and bigger - probably clusters of vacancies. Increase in shot peening time causes reduction of positron trapping rate and lifetime rise in bigger defects.
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