Abstract
14Cr oxide dispersion strengthened (ODS) alloys with the additions of Y2O3, La2O3 and CeO2 (denoted as 14Y, 14L, and 14C), respectively, were produced by mechanical alloying (MA) and spark plasma sintering (SPS). The effects of Y2O3, La2O3 and CeO2 on the microstructures of 14Cr-ODS alloys were characterized by using electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM), and the mechanical properties were evaluated using microhardness and tensile test. The results showed that ultra-fine grains with random crystallographic orientations are formed in the SPSed ODS alloys. High-density nanoscale Y2Ti2O7 oxides in 14Y, La2Ti2O7 oxides in 14L and Ce2Ti2O7 oxides in 14C are observed, respectively. The average oxide size increases while the areal number density of them decreases in order of 14Y, 14L and 14C. The yield strength of 14Y alloy is higher than that of 14L and 14C. The contributions of Hall-Petch strengthening and dispersion strengthening to yield strength in the three kinds of alloys are estimated.
Published Version
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