Nano-Indentation Measurement for Heat Resistant Alloys at Elevated Temperatures in Inert Atmosphere

Abstract

A new approach of nano-indentation measurements at elevated temperatures has been developed to evaluate a temperature-dependent mechanical behavior of heat resistant alloys on a submicron scale, where the measurement is conducted in an inert atmosphere to prevent the surface oxidation of a sample and heat an indenter passively. The developed approach enables us to perform nano-indentation testing with a diamond indenter in the temperature range of 23³800°C. The developed approach has been applied to gamma single-phase single-crystal of a nickel-based superalloy. Then the degradations of the sample surface and the indenter tip have been discussed in this case.

Nano-indentation Measurement for Heat Resistant Alloys at Elevated Temperatures in Inert Atmosphere

“…A new approach of nano-indentation measurement at elevated temperatures up to 800 °C in an inert atmosphere was developed in this study and evaluated the temperature-dependent mechanical behavior of gamma single-phase single-crystal of a nickel-based superalloy (1). By passive heating and calibration of area function at each temperature, reliable measurements could be performed with a diamond indenter.…”

Temperature Dependence of Nanoindentation-Induced Deformation Dynamics in Zr-Based Bulk Metallic Glass

“…Details of the device are described elsewhere. 17) A schematic diagram of the machine is shown in Fig. 1(a).…”

Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests

“…Instrumented indentation tests were performed at 300 • C using a diamond Berkovich indenter with the TI 950 TriboIndenter and xSol High-Temperature Stage (Bruker, Billerica, MA, USA), preventing the degradation of the specimen surface and indenter tip in the measurements in an inert argon atmosphere. The following experimental procedure for high-temperature indentation tests was established in our previous study [12].…”

“…Suzuki and Ohmura [11] first reported high-temperature nanoindentation measurements up to 600 • C on silicon samples. Ruzic et al [12,13] extended the maximum temperature to 800 • C under an inert atmosphere. Minnert et al [14] developed an improved nanoindentation system and characterized the creep behavior of a nickel single crystal at temperatures up to 1100 • C.…”

“…In the above studies, the creep behavior under an applied load in an instrumented indentation test was examined to correlate the results with creep properties, requiring long tests with duration over 1 min. The duration of high-temperature indentation tests should be minimized to prevent the degradation of the specimen surface and the indenter tip [12]. In creep measurements, the loading and unloading processes are generally ignored.…”