1. Surface microstructure and property modifications in a Mg-8Gd-3Y-0.5Zr magnesium alloy treated by high current pulsed electron beam.
- Author
-
Zhang, T.C., Zhang, K.M., Zou, J.X., Yan, P., Yang, H.Y., Song, L.X., and Zhang, X.
- Subjects
- *
MAGNESIUM alloys , *ELECTRON beams , *RESIDUAL stresses , *SURFACE properties , *THERMAL stresses , *SURFACE preparation - Abstract
Abstract In the present study, the effect of high current pulsed electron beam (HCPEB) surface treatments on the microstructure, composition, stress states and properties of a Mg-8Gd-3Y-0.5Zr alloy has been investigated. The surface layers showed different features in microstructure and residual stress states under different number of pulses. Such a variation is essentially due to the different level of the dissolution of β-Mg 5 (Gd,Y) particles in remelted layers and the impact from thermal stresses generated by HCPEB treatments. The results have shown that, after 5 pulses of HCPEB treatment, maximum hardness in the surface layer of the sample was increased by 35% and the corrosion rate in 3.5 wt% NaCl water solution was reduced by 30% as compared with those of the untreated sample. The formation of nano structured cells of Mg-RE solid solution and β-Mg 5 (Gd,Y) nano precipitates, together with the residual compressive stress in the surface layer of the 5 pulsed sample account for the increased microhardness and improved corrosion resistance of the HCPEB treated Mg-8Gd-3Y-0.5Zr Mg alloy. Highlights • Mg 5 (Gd,Y) precipitates in the Mg-8Gd-3Y-0.5Zr alloy were dissolved into matrix after HCPEB treatment. • Hardness is increased in the HCPEB treated surface layers due to the formation of nanostructures and residual stresses. • Increased Gd/Y content and residual compressive stress in the 5 pulsed sample account for the improved corrosion resistance. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF