A VALUABLE VIEW ON EVALUATION OF GENERAL MECHANICAL PERFORMANCES PERTAINING TO Bi-2223 SUPERCONDUCTING CERAMICS WITH VANADIUM ADDITION
Küçük Resim Yok
Tarih
2020
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this research, our scientific group investigates the effect of vanadium addition in the Bi-2223 superconducting matrix onthe general mechanical performance features by the help of experimental microhardness measurements conducted by a smallindenter between the well-defined stress loads of 0.245 N and 2.940 N. Moreover, we determine the key mechanical designparameters including the elastic moduli with the hardness, stiffness coefficients, fracture toughness, yield strength, brittlenessindex and its opposite behavior (ductility) in the applied test loads given using the experimental data deduced from themicroindentation tests. According to the experimental findings, it is oberved that the presence of vanadium content in the Bi2223 crystal structure surpasses seriously the general mechanical performance and related parameters due to the degradation inthe quality of grain boundary couplings, crystal structure and basic structural quantities as a consequence of the increment in thestructural problems, permanent plastic deformations, crack-producing flaws and dislocations. In other words, the augmentationof vanadium compounds in the Bi-2223 superconducting lattice brings about the considerable enlargement in the responsibilityto the static indentation loads. Namely, the sensitive level to the applied loads increases rapidly with the vanadium concentration.We also search the variation of graphs between the Vickers hardness parameters and applied test loads. In this respect, all thematerials prepared in this work exhibit the standard ISE (indentation size effect) characteristics but within the decrement trendas the vanadium content level increases. In more detail, the impurity atoms damage harshly the ISE feature of Bi-2223 type-IIsuperconducting ceramics. Additionally, we discuss the change of plateau limit regions coincided with the permeant artificialstructural problems in the graphics. The vanadium leads to shorten the applied test load values for the plateau limit regions ofBi-2223 materials, stemmed from the enhancement the general structural problems. To conclude, the vanadium inclusions areploughed to improve the general mechanical performance features and key mechanical design parameters.
Açıklama
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Kaynak
Eskişehir Technical University Journal of Science and and Technology A- Applied Sciences and Engineering
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Scopus Q Değeri
Cilt
21
Sayı
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