Tensile mechanical properties of (Nd,Eu,Gd)–Ba–Cu–O bulk superconductors at room and liquid nitrogen temperatures

Investigation of effect of annealing temperature on mechanical properties of MgB2

“…It is also obvious from the figure that the Vickers microhardness values are load dependent for all samples; the calculated microhardness value decreases non-linearly as the applied load increased until 1 N, then it tends to attain saturation. This non-linearity has also been observed for Bi-Pb-Sr-Ca-Cu-O samples [26][27][28], for MgB 2 samples [5,6] and it …”

Transport, microstructure and mechanical properties of Au diffusion-doped Bi-2223 superconductors

“…The rapid variation of microhardness was observed with increasing applied load from 0.245 to 1.96 N. The reason for this behaviour is due to the contribution of weak grain boundaries and to the process of crack formation along grain boundaries [40]. A similar result was observed for Bi-2223 samples [26,28,29] and is known as indentation size effect (ISE) [41][42][43][44]. The indenter gives geometrically similar indentation; hence, it follows that the measured hardness must be independent of the applied load.…”

“…Many studies of doping into superconductor oxide ceramics have been made in order to improve their mechanical and superconducting properties [25][26][27][28][29][30]. Engineering applications of high critical temperature (T c ) superconducting ceramics are generally restricted because of their brittleness.…”

Some physical properties and Vickers hardness measurements of Fe diffusion-doped Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy superconductors

“…This non-linear behavior has also been observed in the literature for Bi-Pb-Sr-Ca-Cu-O samples [17,20,28] and is known as indentation size effect (ISE) [29][30][31][32]. To account for this effect, several relationships between the applied load and the resulting indentation size have been suggested [33][34][35][36].…”