The effect of rare earth elements on the kinetics of the isothermal coarsening of the globular solid phase in semisolid AZ91 alloy produced via SIMA process

• Published in: Journal of alloys and compounds Vol. 489; no. 2; pp. 570 - 575
• Main Authors: Nami, B., Shabestari, S.G., Miresmaeili, S.M., Razavi, H., Mirdamadi, Sh
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 21.01.2010; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Kinetics; Magnesium; Materials science; Metals, semimetals and alloys; Microstructure; Physics; Rare earth elements; Semisolid; Specific materials; Magnesium; Kinetics; Rare earth elements; Microstructure; Semisolid; Magnesium base alloys; Particle size; Interface energy; Ostwald ripening; Property composition relationship; Magnesium alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.09.112

In the present study, the effects of rare earth (RE) elements on the microstructure and coarsening kinetics of the solid globular particle in the semisolid slurry of AZ91 magnesium alloy have been studied at 570 °C and 580 °C. The results showed that the coarsening kinetics of the solid globular particles in semisolid slurry of AZ91 alloy satisfies the Ostwald ripening theory. It was shown that the coarsening rate of the solid particles decreases by adding RE elements into AZ91 alloy, specially at 580 °C, which results in the smaller particles size. It was attributed to the solid–liquid interfacial energy reduction due to the addition of RE elements.