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 MPa to MPa, and the ST enhanced from 22. MJ/m3 to 50. 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.
Highlights
Mg and its alloys, as structural materials for automobile and electronics industries, can meet the demands of weight reduction and increasing vehicle efficiency [1,2]
Most of these phases in Mg-Gd-Y were identified as cuboid-shaped phases in previous reference [20], which were detected as YH2 through a combined analysis of secondary ion mass spectrometry (SIMS) and X-ray tomography (XRT)
After the multidirectional impact forging (MDIF) of 100+100 forging passes, the tensile yield strength (TYS) of GW52 alloy increased from 135+−45 MPa to 286+−33 MPa and the static toughness (ST) increased from 22.0+−00
Summary
As structural materials for automobile and electronics industries, can meet the demands of weight reduction and increasing vehicle efficiency [1,2] They exhibited relatively low yield strength and toughness in comparison to their competitors Al and Ti alloys [3]. A similar recrystallization behavior was witnessed in the microstructure of extruded Mg-7.5Gd-2.5Y-3.5Zn-0.9Ca-0.4Zr (wt.%) alloy [12] This should be originated from the strong solute drag or pinning effect of RE-rich precipitates on dislocation glide and rearrangement, especially for those grain boundaries having intensive segregation of solute atoms. In other words, these grain boundaries have already lost the function of recrystallization nucleation. To produce the fine-grained RE-containing Mg alloys, it is necessary to offer appropriate nucleation sites in the grain interior for recrystallization
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