EXAMINATION OF VANADIUM EFFECT ON GENERAL MECHANICAL CHARACTERISTICS OF Bi-2223 MATERIALS VIA SEMI-EMPIRIC MODELS
Küçük Resim Yok
Tarih
2020
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Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In the current work, we semi-empirically investigate the load-independent Vickers hardness values of vanadium added Bi2223 compounds in the plateau limit regions evaluated from the experimental microhardness graphics (Vickers hardnessparameters versus applied indentation test loads) to determine the role of vanadium particles on the general mechanicalcharacteristics with the aid of six mechanical modeling approaches, namely law of Meyer, proportional sample resistance,elastic/plastic deformation, modified proportional sample resistance, Hays-Kendall and indentation-induced cracking models.Throughout the study, the samples are prepared with the different molar rations varying from x=0 to 0.3 by the conventionalceramic method in the normal atmospheric pressure at the room temperature conditions. All the model findings show that themechanical performances tend to constantly reduce with increasing the vanadium concentration level embedded in the Bi-2223superconducting crystal system. This is in accordance to the fact that the concentration level of vanadium remarkably damages themain structural problems and permanent irreversible deformations. In this respect, it is not wrong to verify that the vanadiuminclusions unstabilize the inherit durable tetragonal phase of Bi-2223 inorganic solids, resulting in the regression in themechanical durability (resistance towards to the applied loads) in case of the applied test loads. Moreover, the modelsindicate that every material prepared exhibits the conventional indentation size effect (related to the formation of elastic andplastic deformations in the host crystal structures simultaneously due to the recovery of systems) but within the suppressiontrend. Shortly, all the semi-empiric models preferred in the present work are found to be useful descriptors to define thesuitable relationship between the ion-addition mechanism in the crystal lattice and mechanical durability/performances ofvanadium-added Bi-2223 materials. We should, of course, declare here that Hays–Kendall approach is gathered to be the best approach model for the load-independent Vickers hardness values in the plateau limit regions.
Açıklama
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Kaynak
Eskişehir Technical University Journal of Science and and Technology A- Applied Sciences and Engineering
WoS Q Değeri
Scopus Q Değeri
Cilt
21
Sayı
-
