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Examining with the Sintered Temperature of Mean Grain Size of B_4C-Al-Ni Composites by Ultrasonic Techniques

100%
Özkan V., Sarpün İ.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 1
184-186
EN
Hard, tough, lightweight boron-carbide-reactive metal composites, boron-carbide-aluminum composites, are produced. The ultrasonic velocity and attenuation were measured on B_4C-Al-Ni ceramic-metal composites, which are sintered in the temperature range 500-1200°C, by using the pulse echo method. Ultrasonic velocity, ultrasonic attenuation and rate of screen heights of successive peaks were determined according to the pulse-echo method by using 2 MHz and 4 MHz probes. It was observed that the mean grain size of samples has been changed with the sintering temperature. The velocity was found to be pretty sample dependent at room temperature and increased with increasing sintering temperature. The ultrasonic attenuation at room temperature was found to be more sample dependent. The sintering temperature variation of ultrasonic attenuation exhibited broad minimum values around 1200C and sharp maximum values at 500°C. The increase observed in the temperature variation of longitudinal velocities and attenuation has been qualitatively explained with the help of the temperature variation of decrease value.
2
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Mean Grain Size and Pore Effects οn Ultrasonic Properties οf WC-Fe-Ni and SiC-Fe-Ni Composites

81%
Sarpün İ., Özkan V., Yönetken A., Erol A.
|
EN
In this work, electroless nickel plating technique was used with WC-Fe and SiC-Fe powders. Plated powders were sintered at temperature ranging from 600C to 1100C under argon shroud in Phoenix microwave furnace. The mean grain size is determined by using three different techniques namely ultrasonic velocity, ultrasonic attenuation, and rate of screen heights of successive peaks according to the pulse-echo method by using a 2 MHz and a 4 MHz probes compared with the scanning electron microscopy images. In addition, the relative effects of porosity on ultrasonic attenuation and velocity in the WC-Fe-Ni and SiC-Fe-Ni composite samples are studied. It is seen that the ultrasonic velocity, the ultrasonic attenuation, the rate of screen heights of successive peaks have a linear relation with the mean grain size of samples. However, the correlation coefficients of porosity graphs have higher values than mean grain size graphs for the composite materials as expected. This indicates that porosity determines the ultrasonic velocity and attenuation for the composite samples.
3
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Calculations of (γ,n) Reaction Cross Sections using Different Level Density Models for Some Lanthanide Nuclei

71%
Akçaalan U., Ünal R., Sarpün İ., Yalim H., Oruncak B.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 2B
B-228-B-230
EN
The discrete level information deficiency requires usage of level density models in cross section calculations. The total reaction cross sections for gamma-induced reactions through the six level density models with a consistent parameterization of some lanthanides (^{141}Pr, ^{142}Nd, ^{144}Sm, ^{153}Eu, ^{159}Tb, ^{160}Gd, ^{165}Ho, ^{175}Lu) were calculated using TALYS 1.6 in the incident energy range from 5 to 30 MeV. All calculations from the present study were compared with each other and with data available in the literature.
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