Studying the Short-Term High-Temperature Creep in the Al–6Zn–2.5Mg–2Cu/10SiCp Aluminum Matrix Composite

• Published in: Physics of metals and metallography Vol. 122; no. 8; pp. 782 - 788
• Main Authors: Pugacheva, N. B., Kryuchkov, D. I., Nesterenko, A. V., Smirnov, S. V., Shveikin, V. P.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-08-2021; Springer; Springer Nature B.V
• Subjects: Alloys; Aluminum; Aluminum base alloys; Aluminum matrix composites; Bonding strength; Casting; Chemistry and Materials Science; Cold flow; Compressive properties; Creep (materials); Eutectic reactions; Fillers; Formability; High temperature; Liquid phases; Materials Science; Metallic Materials; Silicon carbide; Strength and Plasticity; Stresses; True strain; Zinc; Zinc compounds; aluminum matrix; microstructure; eutectic; composite; filler; short-term creep; intermetallides; compression
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X21080111

The microstructural transformation of an aluminum matrix composite (AMC) under the conditions of short-term high-temperature creep at temperatures in the range 470–570°C has been studied. The possibility of its nondestructive deformation predominantly under compressive stresses at pressures below the creep limit has been established. It has been shown that structural transformations in the aluminum matrix (Al–6Zn–2.5Mg–2Cu alloy) are promotive for essential deformability of this material. At temperatures above 530°C, an increase in the deformation rate and true strain value is caused by the local formation of a liquid phase by the eutectic reaction α +
S
(Al
2
CuMg) →
L
. Under compressive stresses at a deformation temperature of 540–570°C, the formed alloy flows into the micropores between SiC filler particles. In this case, silicon carbide partially dissolves in the aluminum matrix to strengthen the bonds between the matrix and the filler.