Effect of annealing ambient conditions on crack formation mechanisms of bulk Bi-2212 ceramic systems
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This study paves way to examine the influence of different annealing conditions (temperature range of 830-850 degrees C and duration intervals 24-48 h) on the fundamental mechanical performance and characteristic quantities of polycrystalline Bi2.1Sr2.0Ca1.1Cu2.0Oy (Bi-2212) superconducting ceramics by means of Vickers microindentation hardness tests at the various indentation test loads (0.245 N <= F <= 2.940 N) and some available theoretical approaches. The annealing ambient plays an important role on the operable slip systems and crystal quality. The bulk Bi-2212 superconducting compound prepared at 840 degrees C and 24 h is found to be the least sensitive to the applied test load due to less structural problems, voids, cracks and stress raisers in the crystal system. Conversely, the excess annealing ambient complicates remarkably the control of crack growth size and velocity. Thus, relatively lower load can lead to the formation of crack and acceleration of crack rate up to the critical size and terminal velocity. The samples exhibit the typical indentation size effect (ISE) behavior as a result of predominant character of elastic recovery mechanism. As for the theoretical examination in the saturation limit regions, the indentation-induced cracking (IIC) model wins the comparison as it provides the most accurate results to the experimental findings.
Açıklama
This work was supported by the Sirnak University Scientific Research Project Coordination Unit [Project No: 2019.FNAP.06.02.01].
Anahtar Kelimeler
Bi-2212 Ceramic System, Critical Crack Size, Terminal Velocity Transcrystalline Regions, T-C Superconductors, Microhardness, Temperature
Kaynak
Journal of Asian Ceramic Societies
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
9
Sayı
3
Künye
Erdem, U., Akkurt, B., Ulgen, A. T., Zalaoglu, Y., Turgay, T., & Yildirim, G. (2021). Effect of annealing ambient conditions on crack formation mechanisms of bulk Bi-2212 ceramic systems. Journal of Asian Ceramic Societies, 9(3), 1214-1227.
