Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 13: Topical Session: Nanomechanics of nanostructured materials and systems III - Small scale plasticity

MM 13.1: Topical Talk

Montag, 31. März 2014, 15:45–16:15, BAR 205

Elevated Temperature, In-situ Microcompression Methods — •Johann Michler, Rejin Raghavan, and Jeffrey Wheeler — EMPA,Thun, Switzerland

The small size of nano-mechanical testing equipment creates opportunities for incorporating the equipment into different micro-analysis instruments: SPM, SEM, EBSD, optical probes, etc. This allows in situ sample surface imaging and in-situ microstructure analysis during mechanical testing. In the first part of the talk, we will describe a general nano-mechanical test platform capable of performing variable temperature and variable strain rate testing of micropillars in situ in the scanning electron microscope. Stable, elevated temperature indentation/micro-compression requires the indenter tip and the sample to be in thermal equilibrium to prevent thermal displacement drift due to thermal expansion. This is achieved through independent heating and temperature monitoring of both the indenter tip and sample. Furthermore, the apex temperature of the indenter tip is calibrated, which allows it to act as a referenced surface temperature probe during contact. In the second part of the talk, several case studies based on elevated temperature microcompression experiments will be presented: shear band kineticts in amorphous metals, brittle ductile transitions in Silicon, GaAs, GaN and InSb micropillars, and mechanical behaviour of nanolaminates.