Structure and mechanical properties of extruded Mg–Gd based alloy sheet

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 520; no. 1; pp. 162 - 167
• Main Authors: Hou, Xiuli, Peng, Qiuming, Cao, Zhanyi, Xu, Shiwei, Kamado, Shigeharu, Wang, Lidong, Wu, Yaoming, Wang, Limin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.09.2009; Elsevier
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Extrusion; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Mg–Gd based alloy; Precipitation; Structure; Mechanical properties; Extrusion; Precipitation; Mg–Gd based alloy; Structure; Lanthanide; Ultimate strength method; Ageing; Mg-Gd based alloy; Tensile strength; Thermal stability; Magnesium base alloys; Yield strength; Microstructure; Age hardening; Elongation (mechanics)
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2009.05.034

The Mg–8Gd–2Y–1Nd–0.3Zn–0.6Zr (wt.%) alloy sheet was prepared by hot extrusion technique, and the structure and mechanical properties of the extruded alloy were investigated. The results show that the alloy in different states is mainly composed of α-Mg solid solution and secondary phases of Mg 5RE and Mg 24RE 5 (RE = Gd, Y and Nd). At aging temperatures from 200 °C to 300 °C the alloy exhibits obvious age-hardening response. Great improvement of mechanical properties is observed in the peak-aged state alloy (aged at 200 °C for 60 h), the ultimate tensile strength ( σ b), tensile yield strength ( σ 0.2) and elongation ( ɛ) are 376 MPa, 270 MPa and 14.2% at room temperature (RT), and 206 MPa, 153 MPa and 25.4% at 300 °C, respectively, the alloy exhibits high thermal stability.