Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy numunelerinin yükten bağımsız parametrelerinin yarı ampirik mekanik modellere bağlı olarak incelenmesi

Year 2025, Volume: 29 Issue: 6, 626 - 640, 23.12.2025

Ali Mercan , Muhammed Öz , Tahsin Turgay , Gürcan Yıldırım

https://doi.org/10.16984/saufenbilder.1687983

Abstract

Bu çalışma, 0.245-2.940 N yük aralıklarında gerçekleştirilen standart mikro indentasyon sertliği (Hv) test ölçümlerini kullanarak Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy seramik bileşiklerinin ana mekanik performansının ve mekanik karakteristik davranışının değişimiyle ilgilenmektedir. Hv parametre değerlerinin ikame düzeyine güçlü bir şekilde bağlı olduğu bulunmuştur. Bu bakımdan x=0,1 molar oranıyla hazırlanan Bi-2212 numunesi, kristal yapıda yeni kayma sistemleri, kuvvet bariyer bölgeleri ve gerilme bölgelerinin oluşması nedeniyle uygulanan kuvvetlere karşı en yüksek mekanik mukavemeti ve dayanıklılığı göstermektedir. Başka bir deyişle Bi-2212 ana seramik matrisinde ideal baryum iyonlarının varlığı, çatlak yüzey enerjisinin ve depolanan iç gerilmelerin azalmasına neden olur. Ayrıca, Hays-Kendall (HK), girinti kaynaklı çatlama (IIC), Meyer Yasası (ML), orantısal numune direnci (PSR) ve elastik/plastik deformasyon (EDP) teknikleri dahil olmak üzere mevcut beş yarı deneysel mekanik yaklaşımı dikkate alarak doyma sınır bölgelerindeki yükten bağımsız sertlik parametrelerini ilk kez araştırıyoruz. Yapılan incelemeye göre IIC modelinin, Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy seramik bileşiklerinin mekanik karakterizasyonu için orijinal mikrosertlik parametrelerini tanımlayan en iyi yaklaşım olduğu bulunmuştur.

Keywords

Bi-2212 seramik yapısı , Ba/Bi kısmi ikamesi , Mekanik modeller , Orijinal mikro sertlik özellikleri.

Project Number

2019-6-21-192

Examination of Load-Independent Parameters of Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy Samples Depending on Semi-Empirical Mechanical Models

Abstract

This study investigates how the main mechanical properties and behavior of Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy ceramic compounds change with different levels of barium substitution, using standard microindentation hardness (Hv) tests in the load range of 0.245-2.940 N. Results show that Hv values are strongly dependent on the substitution level that the sample with x = 0.1 molar ratio demonstrates the highest mechanical strength and durability under applied forces because of the formation of effective slip systems, force barrier zones, and stress regions within the Bi-2212 ceramic matrix. In other words, the presence of an optimal amount of barium ions lowers crack surface energy and reduces stored internal strains. In addition, load-independent hardness values in the saturation region were determined using five semi-empirical models; Hays-Kendall (HK), indentation-induced cracking (IIC), Meyer’s Law (ML), proportional sample resistance (PSR), and elastic/plastic deformation (EPD) techniques for the first time. Among these, the IIC model provided the most accurate description of the microindentation hardness data for the mechanical characterization of Bi₂.₁₋ₓBaₓSr₂.₀Ca₁.₁Cu₂.₀Oᵧ ceramic compounds.

Keywords

Bi-2212 ceramic structure , Ba/Bi substitution , Original microhardness features , Mechanical models

Supporting Institution

Sakarya University

Project Number

2019-6-21-192

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