科研之友
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摘要
In order to reflect the superiority of using Cu 6 Y as the Y 2 O 3 source, three different Y sources addition, direct Y 2 O 3 by conventional mechanical alloying process, pure metal Y and Cu 6 Y compound by in-situ fabrication method, were compared in the ODS-Cu with 1.5 wt.% Y 2 O 3 . It was found that compared to Y 2 O 3 or pure metal Y, the brittle Cu 6 Y played the roles of both suitable Y precursor to enhance Y dissolution and process control agent (PCA) to suppress the growth of mechanical alloying (MA) powders. The alloyed layer was thickened with the MA time, and the further MA gradually becomes difficult. It is inefficient to fully alloy the MA powders only by prolonging milling time. The samples by in-situ fabrication method (Y and Cu 6 Y sourced) had more contaminations with Fe, because of the oxidation of milling mediums by Cu 2 O, which was used to oxide the Y precursors to form the Y 2 O 3 . The contaminations contributed to the hard prior particles boundaries where fracture took place during the tensile tests, resulting in the poor tensile performance for the samples by in-situ fabrication method. Considering that the Cu 6 Y sourced sample by in-situ fabrication method formed fine and high dense dispersive Y 2 O 3 particles with the size of 19 +/- 7 nm and a high number density of 1.8 x 10 21 /m 3 , it has a larger potential for improvement once the means to reduce Fe impurities and holes are developed.
