Effect of Ce addition on the microstructure and tensile properties of extruded Mg–Zn–Zr alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 612; pp. 217 - 222
• Main Authors: Jeong, Hu Young, Kim, Beomcheol, Kim, Sung–Geun, Kim, Hyeon Ju, Park, Sung Soo
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 26.08.2014; Elsevier
• Subjects: Alloys; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Elasticity and anelasticity; Elasticity, elastic constants; Elasticity. Plasticity; Exact sciences and technology; Extrusion; Grain refinement; Magnesium; Magnesium base alloys; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Mechanical properties of solids; Metals. Metallurgy; Microstructure; Particle; Physics; Precipitates; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Tensile properties; Treatment of materials and its effects on microstructure and properties; Ultimate tensile strength; Zinc; Particle; Extrusion; Magnesium; Microstructure; Grain refinement; Ultimate strength method; Ductility; Tensile property; Precipitate; Lattice parameters; Structure composition relationship; Cerium addition; Orthorhombic lattices; Yield strength; Crystalline structure
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2014.06.054

The microstructure and tensile properties of extruded Mg–Zn–Zr–Ce alloys with different Ce contents were investigated. Ce addition to ternary Mg–Zn–Zr alloy resulted in significant grain refinement as well as a change in the type of second phase particles from MgZn to Ce(Mg1−xZnx)11, which has a C-centered orthorhombic structure with lattice parameters of a=0.999nm, b=1.146nm, and c=0.976nm. However, fine MgZn2 precipitates were found to exist in the extruded alloys regardless of the level of Ce content. The yield and ultimate strengths of the extruded alloys were significantly increased by Ce addition although the presence of coarse Ce(Mg1−xZnx)11 particles has an adverse effect on ductility.