Design of cost-effective Fe-based amorphous coating alloys having high amorphous forming ability by thermodynamic calculation

• Published in: Metals and materials international Vol. 20; no. 4; pp. 577 - 583
• Main Authors: Jung, Seungmun, Do, Jeonghyeon, Lee, Dong-Geun, Lee, Byeong-Joo, Cha, Gil-up, Lee, Sunghak
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.07.2014; Springer Nature B.V; 대한금속·재료학회
• Subjects: Alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion resistance; Engineering Thermodynamics; Ferrous alloys; Forming; Heat and Mass Transfer; Iron; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mathematical analysis; Metallic Materials; Processes; Protective coatings; Solid Mechanics; Spray coating; 재료공학; casting; microstructure; amorphous materials; phase transformation; driving force of formation
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-014-4001-6

In this study, new cost-effective Fe-based amorphous coating alloys having high amorphous forming ability were developed by varying the Fe content, while their microstructure, hardness, and corrosion resistance were also evaluated. Chemical compositions that have the lowest driving force of formation of crystalline phases such as Fe 3 P, Fe 3 C, and α-Fe were obtained from thermodynamically calculated phase diagrams of the representative Fe x Al 2 (P 10.83 C 7.47 B 1.7 ) 98-x alloy system at a crystallization temperature of 443 °C. Considering the intersections of driving force curves of Fe 3 P and Fe 3 C, Fe 3 P and α-Fe, and Fe 3 C and α-Fe, the Fe contents were found to be 77.8, 76.2, and 75.8 at.%, respectively. The microstructural analysis results of 1.5-mm-diameter suction-cast Fe-based alloys indicated that the Fe 76.5 Al 2 (P 10.83 C 7.47 B 1.7 ) 21.5 alloy had a fully amorphous microstructure, whereas crystalline phases were formed in other alloys. This alloy showed a better hardness and corrosion resistance than conventional thermal spray coating alloys, and its production cost could also be reduced by using less expensive alloying elements, which could provide a good way to practically apply this alloy to Fe-based amorphous thermal spray coatings.