Microstructure development and tensile mechanical properties of Mg–Zn–RE–Zr magnesium alloy |
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| Affiliation: | 1. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada;2. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;3. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;4. Advanced Materials Research Center, Chongqing Academy of Science and Technology, Chongqing 401123, China;5. Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;6. Department of Chemical and Materials Engineering, University of Alberta, AB T6G 2V4, Canada;1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;2. Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province, Taiyuan 030024, Shanxi, China;3. Taiyuan Iron and Steel (Group) Co., LTD, Taiyuan 030003, Shanxi, China |
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| Abstract: | The Mg–5.3 wt.%Zn–1.13 wt.%Nd–0.51 wt.%La–0.28 wt.%Pr–0.79 wt.%Zr alloy prepared by direct chill casting is subjected to hot extrusion. The effects of extrusion ratio and temperature on microstructure and tensile mechanical properties have been studied. The results indicate coarse grains of as-cast alloys are refined with extrusion ratio increasing from 0 to 9. The eutectic constituents are elongated along extrusion direction. However, further increase of extrusion ratio has a little influence on grain refinement and the improvement of mechanical properties of the alloy. Dynamic recrystallisation is the main mechanism of grain refinement during hot extrusion. Raising extrusion temperature results in grain coarsening. Grain shape becomes more equiaxed-like with raising extrusion temperature. At the same time, mechanical properties decrease with the increase of extrusion temperature. |
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