Abstract
The Vickers microhardness of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconducting phase with added SnO2 nano-particles was investigated. The concentration of SnO2 nano-particles x varied from 0.0 to 2.0 of the sample’s total mass. The experimental data of the Vickers microhardness were analyzed using Meyer’s law, the elastic/plastic deformation model, Hays–Kendall’s approach and the proportional specimen resistance model. The Vickers microhardness number Hv increased as x increased up to 0.4 wt%. The load dependence of Hv exhibited a normal indentation-size effect, Hv increased as the applied load increased. Moreover, this dependence was well fitted with the Hays–Kendall approach rather than the elastic/plastic deformation and proportional specimen resistance models. In addition, we calculated Young modulus, yield strength, fracture toughness and brittleness index as a function of both applied load and SnO2 nano-particle concentration.
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