|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-9: Direct Comparison between High Temperature Nanoindentation Creep and Uniaxial Creep Measurements
||Kurt Johanns, Warren C. Oliver, P. Sudharshan Phani
|On-Site Speaker (Planned)
Measuring the uniaxial creep response from nanoindentation has been of great interest to the small-scale mechanics community. However, several experimental and modeling challenges pose obstacles to direct comparison of indentation and uniaxial results. Indentation creep results at a number of temperatures up to 550 °C on commercial purity aluminum alloy will be presented. The activation energy for creep was found to be 140 KJ/mol/K, matching the value determined with high temperature tensile creep experiments. Uniaxial power-law creep behavior is calculated from the indentation data for direct comparison of results to the uniaxial data. The results are in excellent agreement with the uniaxial compression/torsion tests over a wide range of strain rates and temperatures demonstrating the capabilities of the current experimental procedure to study high temperature creep. These results indicate that nanoindentation based techniques can be simple, quick and cost effective for high temperature mechanical characterization of small volumes of materials.