Achieving High-Strength and Toughness in a Mg-Gd-Y Alloy Using Multidirectional Impact Forging

Songhe Lu; Di Wu; Ming Yan; Rongshi Chen

doi:10.3390/ma15041508

Achieving High-Strength and Toughness in a Mg-Gd-Y Alloy Using Multidirectional Impact Forging

Materials (Basel). 2022 Feb 17;15(4):1508. doi: 10.3390/ma15041508.

Authors

Songhe Lu^{1

2}, Di Wu², Ming Yan¹, Rongshi Chen²

Affiliations

¹ Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China.
² Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.

Abstract

High strength and toughness are achieved in the Mg-4.96Gd-2.44Y-0.43Zr alloy by multidirectional impact forging (MDIF). The forged sample has a fine-grained microstructure with an average grain size of ~5.7 µm and a weak non-basal texture, and it was characterized by an optical microscope (OM), scanning electron microscope (SEM), and electron back-scattering diffraction (EBSD). Tensile results exhibit the tensile yield strength (TYS) and static toughness (ST) of as-homogenized alloy dramatically increased after forging and aging, i.e., the TYS increased from 135-5+4 MPa to 337-2+2 MPa, and the ST enhanced from 22.0-0.5+0.3 MJ/m³ to 50.4-5.4+5.3 MJ/m³. Specifically, the forged Mg-Gd-Y-Zr alloy owns higher TYS than that of commercial rolled WE54 (Mg-5.25Y-3.5Nd-0.5Zr) and WE43 (Mg-4.0Y-3.0Nd-0.5Zr) alloys.

Keywords: Mg-Gd-Y alloy; grain refinement; high strength and toughness; multidirectional impact forging; {10–12} twin.