Nanoindentation studies of the mechanical behaviours of spark plasma sintered multiwall carbon nanotubes reinforced Ti6Al4V nanocomposites

Nanoindentation studies and analysis of the mechanical properties of Ti-Nb2O5 based composites

“…where, E i and E s are the elastic modulus of the indenter and sample, respectively; while y i and y s are the Poisson's ratio of the indenter and the specimen, respectively. Fm the hardness and reduced elastic modulus, the elastic strain to failure a the yield pressure were determined using the expressions [24]:…”

“…. The elastic recovery index corresponds to the amount of energy released by the material under the influence of load, and is also a measure of the materials resistance to impact loading; while the plastic recovery index is dependent on the intrinsic plasticity of the material [24,31]. Furthermore, the nanohardness to elastic modulus ratio H E r , dictates the ability of the material to resist elastic strain to failure at nanometer length scales whereas the yield pressure…”

“…The SPS process was selected based on its optimal processing and sintering efficiency and improved material properties imparted over conventional powder metallurgy techniques [21][22][23]. The use of nanoindentation is equally justified as it has been established to be a more amenable and reliable method of assessing mechanical and related properties at small length/size scales than conventional mechanical testing methods [24,25]. The conventional mechanical testing methods often require bulk materials and standard geometries, which are not applicable for nanoindentation testing.…”

Effect of volumetric energy density on microstructure and tribological properties of FeCoNiCuAl high-entropy alloy produced by laser powder bed fusion

“…Generally, materials with higher hardness usually demonstrate a high Young's modulus, which means the materials are hard to deform under a constant load (Musil et al 2002). Recently, it is increasingly recognised that Young's modulus, particularly in abrasion wear, is an equally (if not more) important factor as hardness (Moharrami et al 2013;Okoro et al 2019). However, it is difficult to quantitatively describe the anti-wear ability of materials by using the value of any of these factors (H and E r ).…”

Effect of melting modes on microstructure and tribological properties of selective laser melted AlSi10Mg alloy

“…It is difficult to evaluate the effect of microstructural evolution on wear performance using traditional wear tests. Recent works have been focused on nanoindentation tests to solve this problem (Okoro et al 2019;Zhou, Xu, et al 2019). For example, the relationship between the thickness of α ′ and tribological properties of SLM Ti-13Nb-13Zr alloys can be well established through nanoindentation tests (Zhou, Yuan, et al 2019).…”