Effect of yttrium addition on lattice parameter, Young's modulus and vacancy of magnesium

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 4; pp. 2106 - 2109
• Main Authors: Peng, Qiuming, Meng, Jian, Li, Yangde, Huang, Yuangding, Hort, Norbert
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 25.02.2011; Elsevier
• Subjects: Ab initio calculation; Age hardening; Alloys; Condensed matter: structure, mechanical and thermal properties; Elastic properties; Elasticity, elastic constants; Exact sciences and technology; Lattice parameters; Lattice vacancies; Magnesium; Magnesium base alloys; Mathematical analysis; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Modulus of elasticity; Physics; Solid solution; Solid solutions; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Yttrium; Ab initio calculation; Elastic properties; Solid solution; Age hardening; Impurity density; Elasticity; Lattice parameters; Precipitates; Young modulus; Vacancy density; Valence electron; Yttrium additions; Ab initio calculations; Magnesium
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.11.042

▶ The effect of Y on lattice parameter of Mg is investigated by calculation and XRD measurement. ▶ The effects of Y on the modulus of Mg (T4 and T6 states) are investigated by calculation and tensile test. ▶ The effect of RE on the vacancy of Mg alloys is investigated by calculation and density measurement. The effect of yttrium addition on fundamental characters of magnesium has been investigated by calculated and experimental methods. It was found that the lattice parameter increased and the axial ratio c/ a decreased with the increment of yttrium in solid solution. The approximately linear relationship between Young's modulus and the content of yttrium in solid solution was observed in the single phase solid solution Mg–Y alloys (T4 state). However, Young's modulus was closely relevant to the fraction of second precipitate except the content of saturated yttrium in matrix for the aged Mg–Y alloys (T6 state). The concentration of vacancy increased with the increased content of yttrium in solid solution, which was mainly caused by the atomic size misfit and the difference of valence electrons between yttrium and magnesium.