Structure and Mechanical Properties of Al–Ca–Mn–Fe–Zr–Sc Eutectic Aluminum Alloy after Warm Equal Channel Angular Pressing

• Published in: Russian journal of non-ferrous metals Vol. 62; no. 3; pp. 293 - 301
• Main Authors: Rogachev, S. O., Naumova, E. A., Karelin, R. D., Andreev, V. A., Perkas, M. M., Yusupov, V. S., Khatkevich, V. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.05.2021; Springer Nature B.V
• Subjects: Alloys; Aluminum alloys; Aluminum base alloys; Casting alloys; Chemistry and Materials Science; Corrosion resistance; Dislocation density; Elongation; Equal channel angular pressing; Eutectic alloys; Eutectic temperature; Iron; Manganese; Materials Science; Mechanical properties; Metallic Materials; Physical Metallurgy and Heat Treatment; Scandium; Thermal stability; Ultrafines; Zirconium; severe plastic deformations; microstructure; ECAP; mechanical properties; Al–Ca eutectic aluminum alloy
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821221030123

Recently developed multicomponent eutectic alloys based on Al–Ca are promising for practical application, since they are characterized by low density and high corrosion resistance and are hi-tech in casting and easily deformed in annealed state. These alloys are strengthened by alloying with Mn, Fe, Zr, Sc, and other elements. The ultrafine grained state in aluminum alloys is achieved by severe plastic deformations, for instance, equal channel angular pressing (ECAP), significantly improving their mechanical properties. In this regard, this work is aimed at analyzing the influence of warm ECAP on the structure, mechanical properties, and thermal stability of eutectic aluminum alloy, wt %: Al–3.5Ca–0.9Mn–0.5Fe–0.1Zr–0.1Sc. ECAP is performed on as-cast alloy specimens with a diameter of 20 mm (400°C, route B C , channel intersection angle: 110°, number of passes N = 6). It is been demonstrated that, as a consequence of ECAP, a developed substructure is generated in the alloy with a high density of dislocations and deposition of Al 6 (Mn, Fe) and Al 3 Sc nanosized particles, accompanied by the fragmentation of primary Al 6 (Mn, Fe) coarse particles and eutectic Al 4 Ca particles. Such a change in structure during ECAP leads to the significant strengthening of the alloy: its strength increased 1.5–2.0 times and relative elongation decreased 1.3 times in a specimen of longitudinal cross section, slightly changing in the transversal one in comparison with the initial state.