Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 772, Issue -, Pages 209-217Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.08.012
Keywords
Cu-Cr immiscible alloy; Liquid phase separation (LPS); Laser surface melting (LSM); Microstructure
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Funding
- Chinese Academy of Sciences [yz201636]
- National Natural Science Foundation of China [11672304, 11502269, 11272316, 11272317]
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The effect of cooling rates on the solidified microstructure of Cu-50Cr (wt. %) produced by laser surface melting (LSM) was studied. Layered structure transformed into a dispersed structure when the cooling rate increased from similar to 10(5) K/s to similar to 10(6) K/s. The average diameter of the Cr-rich spheroids in the homogenous layer was reduced to less than 1 mu m, and the migration velocity by Marangoni motion was similar to 10(3) times higher than the velocity by Stokes sedimentation, suggesting that the movements of alpha-Cr droplets containing supersaturated Cu phase during liquid phase separation (LPS) were dominated by Marangoni motion. Although the collisions and coagulations between Cr droplets couldn't be eliminated, the growth was suppressed by high cooling rate. The melt layer presented improved homogenous microhardness and the well-dispersed melt layer exhibited higher withstanding voltage than that of the untreated. (C) 2018 Elsevier B.V. All rights reserved.
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