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Figure 1: Micro- & nanomechanical characterization of superplasticity and related phenomena: (a) Applied approaches; (b) Evolution of the strain-rate sensitivity of Zn-22% Al as a function of strain-rate and temperature determined via nanoindentation.
Micromechanical characterization of superplasticity and related phenomena

Thema: Nanomechanik

Verantwortliche Mitarbeiter:
    →  PD Dr.-Ing. Benoit Merle
    →  M.Sc. Patrick Feldner

Nanoindentation is a versatile micromechanical technique to study elastic as well as plastic material properties at small length scales. Beyond of assessing hardness and Young’s modulus, a couple of methods have evolved in the last years to get insight into the creep properties [1], fatigue behavior, fracture toughness, as well as stress-strain relationship [2] of small microstructural constituents.
The aim of this project is to apply advanced nanoindentation techniques to study the fundamental mechanism of superplastic deformation and its potentially related size effects. The resulting information are coupled with further micro- and nanomechanical testing methods, including in situ TEM tensile experiments as well as pillar compression tests (Figure 1).

Related Publications:

[1] Maier, V., Merle, B., Göken, M., & Durst, K. (2013). An improved long-term nanoindentation creep testing approach for studying the local deformation processes in nanocrystalline metals at room and elevated temperatures. Journal of Materials Research, 28(9), 1177-1188.
[2] Feldner, P., Merle, B., & Göken, M. (2017). Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation. Journal of Materials Research, 32(8), 1466-1473.

Stand: 18.06.2020