Enhancing overall static/dynamic/damping/ignition response of magnesium through the addition of lower amounts ( 2%) of yttrium

摘要

This study examines Mg-Y binary alloys synthesized using disintegrated melt deposition technique and secondarily processed by hot extrusion. The alloys were subjected to ignition, damping and tensile tests to determine the effect of low Y content addition on the properties of Mg. Further, the alloys were also subjected to low and high strain rates of approximately 8.33 x 10(-5) s(-1) and 1.3 x 10(3) s(-1) in compression to elucidate the effect of yttrium addition on dynamic response of magnesium. The results of microstructural characterization revealed a progressive reduction in grain size of magnesium with the increasing presence of yttrium. Transmission electron microscopy revealed the presence of Mg-Y phases irrespective of the limited amount of yttrium. Results of mechanical characterization revealed that increasing presence of yttrium leads to an increase in the ignition temperature, micro-hardness, tensile and compressive fracture strain, 0.2% offset compressive yield and ultimate strength and dynamic strengths with the best values obtained for Mg-1.8Y alloy. An attempt is made in this study to inter-relate the microstructural features with the mechanical response of Mg-Y alloys. (C) 2016 Elsevier B.V. All rights reserved.