The microstructure, tensile properties, and creep behavior of AZ91, AS52 and TAS652 alloy

• Published in: Journal of alloys and compounds Vol. 493; no. 1; pp. 502 - 506
• Main Authors: Kim, Byeong Ho, Lee, Sang Won, Park, Yong Ho, Park, Ik Min
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 18.03.2010; Elsevier
• Subjects: Applied sciences; Creep; Creep properties; Elasticity. Plasticity; Exact sciences and technology; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; TAS652; Mechanical properties; Creep properties; TAS652; Microstructure; Dislocation motion; Creep; Tensile property; Tension test; Dislocation climb; Magnesium base alloys; Precipitation; Grain boundary slide; Activation energy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.12.145

The microstructure, mechanical properties and creep behavior of Mg–6Sn–5Al–2Si (TAS652) alloy were compared with those of AZ91 and AS52 alloys. The as-cast microstructure of the TAS652 alloy revealed the presence of α-Mg, Mg 17Al 12 and Mg 2Sn and Mg 2Si phases. The Mg 2Sn phases precipitated near the Mg 17Al 12 phases, and the polygonal Mg 2Si phases formed within the matrix. The tensile tests showed that the addition of Sn contributed to the formation of dispersed short rod-like Mg 2Sn phases and improved the room and elevated temperature strength. The creep properties of the TAS652 alloy were also superior to those of the AZ91 and AS52 alloys. An analysis of the creep behavior at elevated temperatures suggested that the presence of thermally stable dispersoids in the TAS652 alloy increases the resistance to dislocation movement, which improves the creep properties.