Synergistic improvement in mechanical properties of Mg–Zn–Y alloys with Mille–Feuille structure by prestrain introduction and grain refinement
Year: 2026
Type: article
Abstract: In this study, we attempted to enhance the mechanical properties of the Mille–Feuille (MF)-type Mg–0.4Zn–1.0Y (at.%) alloy prepared by a conventional casting technique. Previous studies have shown that extruded MF-type Mg–0.4Zn–1.0Y (at.%) alloys prepared by rapid solidification exhibit high cluster-arranged nanoplate (CANaP) dispersion, resulting in numerous kinks and demonstrating excellent yield strength with moderate ductility. In contrast, the extruded MF-type Mg–0.4Zn–1.0Y (at.%) alloy produced by casting exhibits low CANaP dispersion, resulting in reduced kink deformation and significantly inferior mechanical properties. CANaPs form owing to the enrichment of L1 2 clusters (Zn 6 Y 8 ) on stacking faults. Therefore, introducing strain before aging treatment is expected to promote CANaP formation. The extruded MF-type Mg–0.4Zn–1.0Y (at.%) alloy with 10% precompression exhibited an approximately 1.7 times increase in the dispersion of CANaPs, increasing kink boundary dispersion. As a result, the extruded MF-type Mg–0.4Zn–1.0Y (at.%) alloy subjected to 10% precompression exhibited a yield strength of 359 MPa and an elongation of 6%. The extruded MF-type Mg–0.4Zn–1.0Y–0.1Zr (at.%) alloy subjected to 10% precompression exhibited a yield strength of 388 MPa and an elongation of 7.2%, demonstrating mechanical properties comparable to those of MF-type alloys produced by rapid solidification. • Precompression before aging treatment helped promote the formation of CANaPs. • The extruded Mg–Zn–Y alloy with 10% precompression exhibited a yield strength of 359 MPa. • With Zr addition, area fraction of high-KAM-region in α-Mg grains increased after precompression. • The extruded Mg–Zn–Y–Zr alloy with precompression exhibited a yield strength of 388 MPa.
Source: Journal of Alloys and Compounds
Authors: Shin-ichi Inoue, Yoshihito Kawamura
Institution: Kumamoto University
Language: English
Subfield: Biomaterials
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,660
OpenAlex ID: W7124428622