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• W1993249942 abstract "Mo–0.6 wt%La2O3–xZrB2 (x=0, 0.5, 1.0, 1.5, 2.0 wt%) alloys were prepared by using the solid–solid mixing/doping method. Microstructure, tensile strength, and ductility were experimentally examined to investigate the effect of ZrB2 addition. Microstructural observations showed that the addition of 0.5–1.5 wt% ZrB2 effectively reduces the grain size of the alloys and remarkably varies the second phase particles distributed at grain boundaries (GBs). The size of intergranular La2O3 particles was decreased with the increasing ZrB2 addition up to 1.5 wt%. ZrO2 particles were produced through reaction between ZrB2 and oxygen, which were predominantly distributed at GBs, increasing the volume fraction of intergranular second phase particles while decreasing the oxygen concentration at GBs. Tensile testing results displayed that the yield strength of alloys was relatively insensitive to the ZrB2 addition, which was quantitatively understood with respect to the strengthening mechanisms. The ductility, however, was strongly dependent on the additions. In particular, the 1.5 wt% ZrB2-doped alloy exhibited a striking ductility increased by over 40% when compared with the ZrB2-free Mo–La2O3 alloy, although the two alloys have the same level in yield strength. The ductilization is mainly related to the GB purifying effect derived from the reaction addition, which overwhelms the weakening effect of intergranular particles on ductility. The findings in the current work provide a possible approach to modify the GBs and hence to improve the ductility of BCC alloys such as in present Mo alloys." @default.
• W1993249942 created "2016-06-24" @default.
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• W1993249942 date "2014-12-01" @default.
• W1993249942 modified "2023-10-15" @default.
• W1993249942 title "Ductilizing Mo–La 2 O 3 alloys with ZrB 2 addition" @default.
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• W1993249942 doi "https://doi.org/10.1016/j.msea.2014.09.086" @default.
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