Use of instrumented micro-indentation to study the mesoscopic elasto-plastic behavior of GH4145/SQ superalloy during high-temperature cyclic straining

► Instrumented micro-indentation for measurement of mesoscopic mechanical properties. ► Various characteristic parameters of indentation for cycled specimens are determined. ► Fatigue mesoscopic elasto-plastic properties are estimated. ► During cycling fatigue mesoscopic elasto-plastic properties obey normal distributions. ► Deformation microstructures are examined to provide the micromechanisms.