首页|Microstructure development of Y–Ti–O dispersion strengthened Cu alloys fabricated by mechanical alloying
Microstructure development of Y–Ti–O dispersion strengthened Cu alloys fabricated by mechanical alloying
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NSTL
Elsevier
? 2022A Y–Ti–O oxide-dispersion-strengthened (ODS) Cu alloy has been successfully fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). Excessive cold-welding during high energy ball-milling was effectively suppressed by mixing TiO2 and pre-alloyed Cu(Y) powders as the raw powders. Microstructural evolutions during the MA and SPS processes and the subsequent annealing were investigated with a focus on the Y–Ti–O nano-oxides. The 12 h ball-milling failed to achieve super-saturations of Y, Ti, and O in Cu, which led to the in-situ formation of various types of oversized Y/Ti-rich oxides with very irregular morphologies during the SPS. With a prolonged ball-milling of 48 h, the subsequent SPS + annealing processes can promote a high density precipitation of ultra-fine Y–Ti–O nano-oxides. These nano-oxides were further identified as Y2Ti2O7 mostly, with a high degree of coherency in Cu. Fabricating Y–Ti–O ODS-Cu alloys via MA was thus confirmed to be technically feasible, although the dispersion of nano-oxides desires further improvement.
Mechanical alloyingMicrostructureNano-oxideOxide dispersion strengthened copper alloyTransmission electron microscopy
Zhao M.、Xu B.、Yan Y.、Zhang P.、Xu J.、Jiang Y.、Liu F.
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School of Aerospace Engineering Huazhong University of Science and Technology
State Key Lab of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology
State Key Laboratory of Powder Metallurgy School of Materials Science and Engineering Central South University
NSTL
Elsevier
