Abstract
Mg alloys have various advantages. However, the low formability due to the poor ductility of Mg alloys limits their engineering applications. In this study, an Mg-3% Gd alloys was chosen to explore processing approaches for improving its strength and ductility combination. The alloy was processed by accumulative roll-bonding (ARB) at 400 °C to 4 cycles followed by annealing at various temperatures. The microstructures after annealing were characterized by the electron backscatter diffraction technique and the mechanical properties were measured by a tensile test. It was found that the alloy has a good combination of strength and ductility after 2 cycle ARB processing followed by annealing at 290°C for 1h. The strength is 2.3 times higher than that of the fully annealed coarse grained alloy, and the elongation is comparable with that of fully annealed coarse grained counterpart. The good mechanical properties were related to the fine-sized heterogeneous microstructures and weakened texture.
Highlights
There has been an increasing demand for magnesium (Mg) alloys as light-weight structural materials in automobile industries during the last decade, mainly due to their various advantages, such as high specific strength, light weight and good dump resistance
The (0002) pole figure (Figure 1b) of the starting sheets determined by electron backscatter diffraction (EBSD) shows a basal texture, which is typical for Mg alloys
It is seen that the microhardness of the sample increases from 43 to 62 during the first pass of the accumulative roll-bonding (ARB) processing; and a very small change is observed during the following passes
Summary
There has been an increasing demand for magnesium (Mg) alloys as light-weight structural materials in automobile industries during the last decade, mainly due to their various advantages, such as high specific strength, light weight and good dump resistance. The most effective method to overcome this major drawback of Mg alloy is modifying their microstructures and textures. Severe plastic deformation (SPD) techniques, such as equal channel angular extrusion, differential speed rolling, large strain hot rolling and accumulative roll-bonding (ARB), have been proved to be effective to weaken the basal texture or to obtain a modified microstructure in Mg alloys. The microstructures and texture of the AZ-series Mg alloys processed by ARB method have been well studied in the past decade [2,3,4]. Hot processing and post-deformation annealing has been proved be a significantly effective to weaken the textures of Mg alloys containing rare earth (RE) elements, such as Nd, Ce, Gd and Y [5, 6].
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 callMore From: IOP Conference Series: Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
