Abstract
Extruded Mg-Gd-Y alloy tubes were obtained by using cast ingot and extruded bar billets. Microstructure and mechanical properties were also studied with two different cooling methods: air cooling and water cooling. The result shows that by using an extruded bar as billet extruded tubes achieves higher elongation comparing to using cast ingots due to favored texture for the activation of basal slip. Using the water-cooling method, extruded tubes achieve a higher yield strength compared to the air cooling method due to their fine grain size. Using cast ingot billets and the water-cooling method, the elongation is only 6% due to large unrecrystallized grains caused by inhomogeneous deformation and unfavored texture for the activation of basal slip. Using the extruded bar billet and the water-cooling method, the tube has uniformed small grains and much more randomized texture caused by the inhibition of preferred grain growth process. The highest texture intensity is only 1.852 in this kind of tube. Both high yield strength (195.3 MPa) and high elongation (23.9%) are achieved in this tube.
Highlights
Wrought magnesium alloys attract significant interest in fields such as automobiles, aircraft and space machinery due to their high strength properties combined with quite low density [1,2]
Our recent work reported a significant increase in elongation in pure magnesium due to the addition of only 1% Gd in rolling sheets, and attributed this increase to a change in the texture that favors basal slips [16]
Texture will be weakened with RE addition [20,21,22], but the texture is still dependent on the processing parameters [23]
Summary
Wrought magnesium alloys attract significant interest in fields such as automobiles, aircraft and space machinery due to their high strength properties combined with quite low density [1,2]. Especially hollow sections, could further offer attractive mass-saving opportunities for automotive light weighting with potential applications in instrument panel beams, seat frames, roof frames, bumper beams, radiator support, engine cradles and subframes [3]. It is, meaningful to produce high-strength magnesium alloy tubes as an alternative to aluminum and steel. Recent work confirmed that small additions of rare earth elements can improve the mechanical properties of magnesium extrusions and sheets via grain refinement and weakening of texture [16]. The aim is to develop the process for high-performance tubes in automobiles
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