An analysis of load-depth data in depth-sensing microindentation experiments for intermetallic MgB2

Analysis of ISE in microhardness measurements of bulk MgB2 superconductors using different models

“…Then, pellets are placed in an ␣-alumina boat and sintered at 950 • C for 2 h under Ar atmosphere. In order to compensate evaporation of Mg from the sample, extra pure Mg powder of 5 mg is used [11]. The test specimen is mechanically polished by alumina powders (0.1 and 0.05 m) and cleaned with acetone.…”

“…Vickers microhardness test is one of the convenient methods to estimate the mechanical properties of materials. On the other hand, depth sensing (or dynamic) microindentation method that is used in this study offers great advantages over the conventional Vickers microhardness testing [6][7][8][9][10] Recently, Vickers microhardness testing has been applied to different kind of materials (superconductors, ceramics, semiconductors, thin films, polymers, and alloys) [1,[11][12][13][14][15][16]. It is revealed that some materials exhibit an increase in the hardness with decreasing load (indentation size effect, ISE) while others undergo a decrease in the hardness with decreasing load (reverse indentation size effect, RISE).…”

Effects of ZnO addition on mechanical properties of Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10 prepared by a wet technique

“…These few works, on the other hand, have employed conventional method to investigate these properties. Despite its easy determination of measured mechanical properties of the materials, the depth-sensing indentation method has been used in a few studies aiming to determine the mechanical properties of superconductors [17][18][19][20][21][22]. These a few studies, however, were not enough to clearly determine the mechanical properties of superconductor material.…”

“…Second, the load and depth of the indentation are continuously monitored and optical observation and measurements of the diagonal lengths of the indent/impression, which can be difficult and subject to inaccuracy, are no longer required. This method was used to deter- mine mechanical properties of different materials in many studies because of these advantages [17][18][19][20][21][22][23][24][25][26][27].…”

Physical and Mechanical Properties of B2O3 doped YBaCuO Superconductors: Applicability as a Low DC Magnetometer

“…Experimental set up for the second harmonic measurements were described in [4,5]. The electronics and the test conditions are explained in [4].…”