Rapid Synthesis of W–Cr Solid–Solution by Dielectric-Barrier Discharge-Plasma-Assisted Ball Milling

• Published in: Metals and materials international 2021, 27(12), , pp.5389-5398
• Main Authors: Hong, S. F., Lu, Z. C., Liu, Y. H., He, Q. M., Jiang, W., Zeng, M. Q.
• Format: Article
• Language: English
• Subjects: Alloy systems; Ball milling; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium base alloys; Dielectric barrier discharge; Engineering Thermodynamics; Free energy; Grain boundaries; Heat and Mass Transfer; High temperature effects; Internal energy; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Plasma; Processes; Solid Mechanics; Solid solubility; Solid solutions; Tungsten; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-021-00997-6

Supersaturated solid–solutions in a W–Cr alloy system were fabricated by conventional milling and plasma milling. The different extension mechanisms of the solid solubility that were created by ball milling with and without discharge plasma were studied. The solid–solubility of Cr in W for the P-milling W–Cr alloy system was higher, which indicates that plasma milling promotes the formation of W(Cr) solid–solution more easily than conventional milling. According to Miedema’s model, in the W–Cr alloy system, the free-energy change to form a W(Cr) solid solution by plasma milling is reduced compared with conventional milling because of the heating effect of the discharge plasma. Therefore, a higher stored energy in the grain boundaries and dislocations of the W–Cr nanograins during plasma milling makes it easier to overcome the thermodynamic barrier in the formation of a solid–solution, when compared with conventional milling. Graphic Abstract