Microstructure and texture evolution with Sm addition in extruded Mg–Gd–Sm–Zr alloy. (22nd September 2021)

• Record Type: Journal Article
• Authors: Bao, Jian; Li, Quanan; Chen, Xiaoya; Zhang, Qian; Chen, Ziyi
• Is Part Of: Materials research express. Volume 8:Number 9(2021)
• Publication Date: 2021-09-22
• Subjects: Mg–Gd–Sm–Zr alloy -- microstructure -- precipitates -- texture -- tensile properties; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac25b7
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: We prepared as-extruded Mg-10Gd- x Sm ( x = 1, 3, 5)-0.5Zr alloys by indirect extrusion, and the microstructure, texture and mechanical properties of as-extruded Mg-10Gd- x Sm-0.5Zr alloys were investigated. The results indicate that the microstructure, texture and strength of as-extruded Mg-10Gd- x Sm-0.5Zr alloys take a great variation with Sm addition. Dynamic recrystallized grain size is decreased with increasing Sm content, and the average grain size rapidly reduced to 1.4 μ m in as-extruded Mg-10Gd-5Sm-0.5Zr alloys due to abundant Mg5 (Gd, Sm) and Mg41 (Gd, Sm)5 precipitates and their pinning effect on grain boundaries. With an increasing Sm content, the texture has a significant variation. The fiber texture with ⟨10-10⟩ axis of Mg matrix parallel to extrusion direction (ED) in as-extruded Mg-10Gd-1Sm-0.5Zr alloy transformed into an abnormal texture with ⟨0001⟩ axis of Mg matrix parallel to ED in as-extruded Mg-10Gd-3Sm-0.5Zr alloy. The tensile yield strength and Brinell hardness gradually increase with Sm addition due to soild solution strengthening, refined grain boundaries strength and numerous precipitates strengthening. However, the as-extruded Mg-10Gd-5Sm-0.5Zr alloy exhibits the poor ductility due to stress concentration caused by abundant precipitates.