Search

Abstract: The influence of Y on microstructure and mechanical properties of as-cast Mg–5Li–3Al–2Zn alloy was investigated. The results show that the phase compositions of Mg–5Li–3Al–2Zn consist of α-Mg and AlLi phases. Adding Y to the alloy results in the formation of Al2Y compound and facilitates grain refinement. The addition of 0.8wt.% Y produces the smallest grain size. The tensile tests performed at room temperature show that the additions of Y can improve the mechanical properties of the alloy; the tensile strength and ductility reach peak values when the Y additions are 0.8wt.% and 1.2wt.%, respectively. The mechanisms of improvement are related to grain refinement and compound strengthening effects. [Copyright &y& Elsevier]

Abstract: Superlight alloys, including Mg–8Li–1Al, Mg–8Li–1Zn and Mg–8Li–1Al–1Zn, were prepared using vacuum induction melting furnace. Microstructures and phases of the alloys were studied with optical microscope and X-ray diffraction. Mechanical properties of these alloys were measured with tensile tester. The results of tensile tests show that, the as-rolled Mg–8Li–1Al alloy with a thickness of 0.16mm has the highest tensile strength (313.9MPa). The as-extruded Mg–8Li–1Zn alloy with a thickness of 3mm has the maximum elongation (44%). The as-rolled Mg–8Li–1Al–1Zn alloy with a thickness of 0.18mm has both high tensile strength and high elongation (233.38MPa and 9.2%, respectively). [Copyright &y& Elsevier]