The yield stress anomaly in stoichiometric FeAl at high strain rate
- Dartmouth Coll., Hanover, NH (United States). Thayer School of Engineering
- Los Alamos National Lab., NM (United States). Materials Science and Technology Div.
Single crystals and large-grained polycrystals of B2-structured FeAl containing initially low vacancy concentrations exhibit a so-called yield anomaly, with a yield strength peak at typically {approximately}0.40--0.45 of the absolute melting point. If the grain size in a polycrystal is fine, declining Hall-Petch strengthening with increasing temperature can obscure this yield anomaly. Similarly, vacancies retained after elevated temperature annealing can raise the low temperature yield strength to such an extent that the yield anomaly is not observed, an effect that has been most clearly demonstrated by Carleton et al. The purpose of the work reported here was to examine whether staining at a higher strain rate would shift the yield strength peak in stoichiometric FeAl to higher temperatures, as predicted by the vacancy-hardening model.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- FG02-87ER45311
- OSTI ID:
- 349868
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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