Abstract
Among all alloying elements the rare earth elements (RE) play a key role in improving the ductility, high temperature strength and corrosion resistance effectively for magnesium and its alloys. The present work investigated the influences of single alloying or multi heavy REs (Gd, Dy and Y) alloying on the strengthening and ductilizing of magnesium. These heavy REs have a higher solid solubility in magnesium than that the light REs such as Nd and Ce. It is found that the solid solution strengthening caused by Gd follows the linear relationship with the exponent n value of 1/2 or 2/3. When adding two or more heavy REs in Mg, owing to their interactions and resultant synergetic effects, the effectiveness of strengthening and ductilizing caused by multiple RE addition is much better than that by single RE addition.
Highlights
Mg alloys with a low density and high specific strength is an ideal structure engineering materials for light-weighting applications
The additions of heavy rare earth elements (RE) in Mg can lead to the improvement of strength
The yield strength increases with the increment of RE contents
Summary
Mg alloys with a low density and high specific strength is an ideal structure engineering materials for light-weighting applications. The element Mn is an important element to improve the corrosion resistance with alleviating the impurity Fe in Mg. the additions of these elements are sometimes only effective to increase one specific property, and deteriorate the other property. Despite that REs have a higher cost than the above-mentioned elements, their additions to magnesium alloys were previously confirmed to have positive influences on their overall performance, including the low and high temperature mechanical properties, and corrosion resistance. The roles of their additions can randomize the texture and improve the formality of magnesium alloys. The synergic effects caused by multialloying with REs were explored
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