Nanohardness and elastic modulus at the interface of TiCx/Ni3Al composites determined by the nanoindentation technique

The effect of heat treatment on microstructure and hardness of in-situ Ti-38Al-7.5Nb-5C-0.9Mo composite

“…The measured nanohardness of (Ti,Nb)C of 38 GPa exceeds more than twice the nanohardness of (Ti,Nb) 2 AlC phase, and this value falls within the wide range of 25-50 GPa reported by Hua et al [27] for TiC particles in intermetallic Ni 3 Al matrix. The elastic modulus of (Ti,Nb) 2 AlC phase is measured to be 238 GPa, which corresponds to the values of 220-240 GPa published by Wei at al.…”

Evaluation Technique of the Hardness and Elastic Modulus of Materials with Fine Microstructures

“…The materials were prepared by arc casting, and then some of the ingots were subjected to heat treatment at 1870 K for 100 h or at 2070 K for 20 h. The procedure for fabricating Nb-base in-situ composites is reported in more detail elsewhere. 5,6) Table 1 shows the designated names, nominal compositions and conditions of the heat treatments of the materials. Figure 1 shows a typical microstructure of an Nb-base in-situ composite.…”

“…Therefore, a lot of studies concerned with the evaluation of E and H of bulk materials and thin films by nanoindenter have been reported in recent years. [3][4][5] The micro-Vickers hardness, Hv, which represents the reliable hardness of metals and ceramic materials determined in the micro-scale regime, is one of the most widely used hardness standards. Therefore, comparison with the hardness data obtained by micro-Vickers tests and nano-indentation tests has significant importance, because when a clear relationship between both hardness values is developed, the nanoindentation tests can provide a hardness evaluation that is compatible to micro-Vickers hardness, on nanoscale-size phases.…”

Force measurements with the atomic force microscope: Technique, interpretation and applications

“…The measurement is focused on the result of a given indentation, i.e., on the shape of the ''imprinted'' hole, and not on the dependence of the deformation on the load. Hence, we refer the reader to other reviews [256] and to some recent works [257][258][259][260].…”