Improvement in deformation degree of Zr surface-layered Bi-2223 ceramics by diffusion annealing temperature
Yükleniyor...
Tarih
2023
Yazarlar
Mercan, Ali
Terzioğlu, Rıfkı
Doğan, Muhsin Uğur
Kaya, Şenol
Erdem, Ümit
Yıldırım, Gürcan
Terzioğlu, Cabir
Varilci, Ahmet
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci LTD
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study investigated the effects of different annealing temperatures (650 degrees C <= T <= 840 degrees C) on the surface morphological and mechanical performance properties of Zr surface-layered Bi-2223 materials with scanning electron microscopy (SEM) images, Vickers microhardness (Hv) measurements, and semi-empirical mechanical approaches. It was observed that the ceramic compound exposed to 650 degrees C annealing temperature exhibited the superior performance features due to the enhancement in the deformation degree. This is because the Zr ions behaved as the nucleation centers to prevent the propagations of cracks and dislocations throughout the main matrix depending on the decrease in the degree of granularity and distributions of crystal structure problems over a wider area. Similarly, the SEM pictures indicated that the diffusion mechanism increased the random distributions of the thinner plate-like granular structures (serving as nucleation centers), leading the decrease in the coupling problems between the grains. Among the materials, the highest surface densification was observed for the compound exposed to 650 degrees C. Namely, surface morphological analysis showed a strong correlation be-tween microstructure and mechanical performances. Further, the zirconium ions were found to decrease in the non-recoverable stress concentration sites, crack-initiating defects, and dislocations in the ceramic system. Accordingly, the sensitivity to the applied test load was noted to decrease dramatically. Shortly, crack growth size and velocity were observed to be more easily under control. Correspondingly, the Zr ions delayed consid-erably the beginning points of saturation limit (load-independent) regions for the bulk Bi-2223 superconducting materials. Additionally, the Zr ions led to the change in the mechanical characteristic behavior from typical indentation size effect to reverse indentation size effect. Lastly, the microindentation hardness measurements were semi-empirically analyzed by the different models. According to the comparison, Hays-Kendall mechanical model was noted to provide the closest parameters to the load-independent microhardness results.
Açıklama
This work was partially supported by own budget of the authors and partially supported by Bolu Abant Izzet Baysal University with contact no 2022.09.03.1560. Also, The authors would like to express their gratitude to Kirikkale University Research Fund for its partially financial support in spectral analysis. Project Numbers: 2022/044.
Anahtar Kelimeler
Zr-Diffused Bi-2223, Solid-State Mechanics, Slip Systems, Mechanical Properties, SEM, Mechanical Modelling
Kaynak
Ceramics International
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
49
Sayı
12
Künye
Mercan, A., Terzioğlu, R., Doğan, M. U., Kaya, Ş., Erdem, Ü., Yildirim, G., ... & Varilci, A. (2023). Improvement in deformation degree of Zr surface-layered Bi-2223 ceramics by diffusion annealing temperature. Ceramics International, 49(12), 20495-20504.
