Temperature dependence of indentation size effects, pile-up and strain rate sensitivity in polycrystalline tungsten from 25-950 C

Conference Dates

October 1-6, 2017


Elevated temperature nanoindentation measurements were performed on polycrystalline tungsten to 950 ºC. Tests were carried out under high vacuum conditions as tungsten oxidizes in air at >500 ºC. The temperature dependence of the hardness, elastic modulus, strain rate sensitivity, activation volume and the indentation size effect in hardness were investigated at 25, 750, 800, 850, 900 and 950 ºC. Thermal drift assessed from the last 60% of a hold period at 90% unloading was typically ~0.05 nm/s and it did not vary significantly with load or temperature [1]. The hardness measurements were in good agreement with previous determinations by non-depth sensing hot microhardness.

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