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An Assessment of Milling Time on the Structure and Properties of a Nanostructured Ferritic Alloy (NFA)
Metallurgical and Materials Transactions A ( IF 1.985 ) Pub Date : 2014-08-27 , DOI: 10.1007/s11661-014-2521-9
Richard DiDomizio, Shenyan Huang, Laura Dial, Jan Ilavsky, Mike Larsen

The tensile properties of a 14 wt pct chromium nanostructured ferritic alloy (NFA) are assessed as a function of attrition time. Small angle X-ray scattering results show quantitatively that the number density of precipitated oxides increases as a function of milling time. This difference in oxide density alone is not enough to describe the tensile behavior of the NFA as a function of temperature. As a result, a previously proposed root mean square strengthening model is applied to the current study where direct dispersion strengthening, grain boundary strengthening, dislocation forest hardening, and matrix hardening are all considered. When an optimization routine is conducted, the fitting results suggest that the precipitated oxides are soft obstacles to dislocation motion.
更新日期:2014-08-27

 

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