Microstructure and deformation behavior of a Mg-RE-Zn-Al alloy reinforced with the network of a Mg-RE phase

• Published in: Metals and materials international Vol. 15; no. 2; pp. 203 - 207
• Main Authors: Shin, Beom Soo, Kwon, Jin Wook, Bae, Dong Hyun
• Format: Journal Article
• Language: English
• Published: Springer The Korean Institute of Metals and Materials 01.04.2009; Springer Nature B.V; 대한금속·재료학회
• Subjects: Alloy development; Alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Elongation; Engineering Thermodynamics; Failure; Heat and Mass Transfer; Machines; Magnesium base alloys; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Metallurgy; Networks; Processes; Residual stress; Solid Mechanics; Yield strength; 재료공학; magnesium alloy; network structure; mechanical properties; misch metal
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-009-0203-8

A new Mg-RE-Zn-Al alloy reinforced with the second phase of Mg 12 (RE) has been developed to enhance mechanical properties at the elevated temperatures. When the alloy solidifies with a relatively high cooling rate under the pressure applied, an extremely fine α-Mg phase with a completely closed network of the second phase of Mg 12 (RE) is developed. The reinforcing network restricts grain boundary sliding during deformation, resulting in a high yield strength of 150 MPa at 150 °C. Furthermore, the refined alloy exhibits around 27 % elongation to failure at 150 °C. This indicates that the failure behavior cannot be affected by the effects of residual stresses induced during solidification and stress concentrations developed near the second phase during deformation.