Abstract
Forging at room temperature was applied on the per-extruded Mg-Gd-Y-Zr alloy to investigate the effect of cold forging on the microstructure, mechanical properties and corrosion resistance of the alloy. Abundant micro shear bands with misorientations of 2–15° were generated in the as forged alloys. Tremendous enhancement in tensile yield strength was achieved after forging. With a quantitative investigation, micro band boundaries were considered to provide a great contribution to the reinforcement. The ultrafine structure resulting from the formation of micro shear bands led to increased corrosion resistance of the alloy.
Highlights
Magnesium alloys are the most promising lightweight structural materials owing to their low density, high specific strength and ideal recyclability, etc. [1]
With the reinforcement introduced by the ultrafine structure, the as-forged AZ61 alloy yielded at a high strength of 480 MPa [5]
After the alloy was forged to a strain level of 7%, as shown in Figure 1b, the grains did not exhibit obvious change in size or shape compared with sample AE, except for the appearance of a small quantity of twin
Summary
Magnesium alloys are the most promising lightweight structural materials owing to their low density, high specific strength and ideal recyclability, etc. [1]. After rolling at room temperature, Mg-Gd-Y-Nd-Zn-Zr alloy exhibited a yield strength higher than 400 MPa with the generation of a large quantity of stacking faults (SFs) [4]. With the reinforcement introduced by the ultrafine structure, the as-forged AZ61 alloy yielded at a high strength of 480 MPa [5]. As the enhancement was not obtained through precipitation, it may be a good approach to develop an Mg alloy with both high mechanical properties and corrosion resistance. Among the various recently developed Mg alloys, Mg-Gd-Y alloys exhibit comparatively good corrosion resistance and high strength, making them available in diverse applications [10,11,12]. Developing a new approach to improve the strength with corrosion resistance maintained is essential for the application of Mg-Gd-Y alloys
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
