Effects of Sn content on the microstructure and mechanical properties of Mg–7Zn–5Al based alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 527; no. 26; pp. 7002 - 7007
• Main Authors: Xiao, Wenlong, Jia, Shusheng, Wang, Lidong, Wu, Yaoming, Wang, Limin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.10.2010; Elsevier
• Subjects: Aging; Alloys; Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Heat resistance; Magnesium base alloys; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Mg–Zn–Al alloy; Microstructure; Optimization; Tensile strength; Tin; Tin base alloys; Mg–Zn–Al alloy; Mechanical properties; Heat resistance; Sn; Microstructure; Heat treatment; Impurity density; Ageing; Tensile property; Mg-Zn-Al alloy; Aluminium alloy; Tension test; Tensile strength; Magnesium base alloys; Tin addition; Yield strength; Zinc alloy
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.07.019

▶ The study investigates the microstructures and tensile properties of the as-cast and heat treated Mg–7Zn–5Al based alloys with 1∼6 wt.% Sn addition. ▶ Results show that Sn addition refines the Mg–Zn–Al eutectic phase. ▶ The Sn-containing alloys exhibit excellent heat resistance. ▶ The aged Mg–7Zn–5Al–2Sn alloy shows optimal mechanical properties. ▶ Ageing treatment can further improve the tensile strength of the studied alloy. The microstructures and tensile properties of the as-cast and heat treated Mg–7Zn–5Al based alloys with 1–6 wt.% Sn addition were studied. The results show that all the Sn-containing alloys consist of α-Mg, τ-Mg 32(Al, Zn) 49, β-Mg 17Al 12 and Mg 2Sn phases. The addition of Sn refines the τ-Mg 32(Al, Zn) 49 phase and suppresses the formation of network-shaped phase. Tensile tests indicate that the Sn-containing alloys exhibit excellent heat resistance, and the yield strength increases with increasing the Sn content. The ageing treatment can obviously improve the tensile strength of the studied alloy, while the aged Mg–7Zn–5Al–2Sn alloy has optimal mechanical properties.