Effect of Barium Addition on Some Mechanical Properties Deduced from Vickers Hardness Tests of Bi-2212 Ceramics

Year 2024, Volume: 16 Issue: 1, 56 - 65, 31.01.2024

Ali Mercan Tahsin Turgay Muhammed Öz Gürcan Yıldırım

https://doi.org/10.29137/umagd.1372306

Abstract

In this study, the variations of the basic mechanical performance properties (microhardness (Hv), elastic modulus, hardness shear modulus, brittleness index, yield strength, elastic hardness coefficient, fracture toughness, ductility, flexibility and durability) of new Bi2.1-xBaxSr2.0Ca1.1Cu2.0Oy (Bi-2212) superconducting materials produced by doping different amounts (ranging from 0.0≤x≤0.1) of barium ions into the crystal matrix of Bi-2212 superconducting material were investigated in detail by microindentation Vickers hardness (Hv) tests in the applied load range 0.245N-2.940 N. In addition, the change of resistance to crack propagation, durable tetragonal phase, mechanical efficiency and mechanical characteristics of the Bi-2212 ceramic system with Ba/Bi partial substitution in the crystal structure was determined. According to experimental and theoretical findings, the overall mechanical performance of the Bi-2212 superconducting crystal structure increased significantly up to the Ba/Bi replacement level of x=0.01, while a systematic reduction was observed after this substitution ratio. Furthermore, the optimum presence of barium in the crystal lattice let to the formation of new slip systems within the structure, new bond formations between atoms, reduction of stress regions on the surface and rise at strength and fracture toughness. Besides, the optimum level resulted in improved material crystal quality and intergranular bonding. When the mechanical characteristic behavior was examined, it was found that all materials presented the typical indentation size effect (ISE) characteristic and there was a significant improvement in ISE characteristic at the optimum replacement ratio.

Keywords

Bi-2212 crystalline system, Ba/Bi replacement, Slip systems, Hv, ISE

Bi-2212 Seramiklerinin Vickers Sertlik Testlerinden Çıkarılan Bazı Mekanik Özellikler Üzerine Barium Katkısının Etkisi

Abstract

Bu çalışmada Bi2.1Sr2.0Ca1.1Cu2.0Oy (Bi-2212) süperiletken malzemesinin kristal matrisine farklı miktarlarda (0,0≤x≤0,1 arasında değişen) baryum iyonu katkılayıp üretilen yeni Bi-2212 materyallerin temel mekanik performans özelliklerinin (mikro sertlik (Hv), elastik modülü, sertlik kayma modülü, kırılganlık indeksi, akma dayanımı, elastik sertlik katsayısı, kırılma tokluğu, süneklik, esneklik ve dayanıklılık) değişimleri 0,245N-2,940 N uygulanan yük aralığında mikroindentasyon Vickers sertlik (Hv) testleri ile detaylı bir şekilde incelenmiştir. Ayrıca, kristal yapıya Ba/Bi kısmi yer değiştirme ile Bi-2212 seramik sistemin çatlak ilerlemesine karşı direnç, dayanıklı tetragonal faz, mekanik verim ve mekanik karakteristik özelliklerin değişimi belirlenmiştir. Deneysel ve teorik bulgulara göre, Bi-2212 süperiletken kristal yapının genel mekanik performansı Ba/Bi yer değiştirme miktarı x=0,01’e kadar önemli miktarda artarken bu yer değiştirme oranından sonra sistematik bir azalma gözlemlenmiştir. Bu bağlamda optimum düzeyde katkılanan baryum kristal yapıdaki dislokasyon hareketlerini kısıtladığı ve dislokasyon çevresindeki kafes şekil değişimine neden olduğu bulunmuştur. Dahası, optimum miktar materyal kristal kalitesinin ve taneler arasındaki bağlantının iyileşmesine neden olmuştur. Mekanik karakteristik davranışlarına incelendiğinde, tüm materyallerin tipi çentik boyut etkisi (ÇBE) karakterini sunduğu ve optimum yer değiştirme durumunda ÇBE karakteristiğinde ciddi bir gelişme olduğu bulunmuştur.

Keywords

Bi-2212 kristal sistem, Ba/Bi yer değiştirme, Kayma sistemleri, Hv, ÇBE

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