(Received 1 October 2001; accepted 26 August 2002)
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Specially designed facilities for creep testing of ultrahigh-temperature alloys are presented. Ohmic heating is chosen for easy access to the sample, quickly attainable heating and cooling rates, and simplicity in design and operation. Strain is measured with a video extensometer by means of the software SuperCreep. SuperCreep allows fast and automated analysis of creep curves. For short but precise representations of creep curves, Bézier splines are used. Creep tests on pure Pt, Pt-10 wt% Rh, and the oxide dispersion strengthened Pt-base alloys Pt DPH and Pt-10 wt% Rh DPH between 1200 and 1600°C have proven the reliability of the equipment. Stationary creep rates follow the Norton power law. Stress exponents, activation energies, and pre-exponential factors are given for the four alloys investigated.
Dr.-Ing., Friedrich-Schiller-University Jena, Jena,
Dipl.-Ing., University of Applied Sciences Jena, Jena,
Prof. Dr.-Ing. habil., University of Applied Sciences Jena, Jena,
Stock #: JTE12351J