Thermal stability of nanocrystalline in surface layer of magnesium alloy AZ91D |
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Authors: | ZHANG Jin OU Xin-bing |
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Affiliation: | [1]Institute of Advanced Material, University of Science and Technology Beijing, Beijing 100083, China; [2]College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400050, China; [3]Nanjing Kerun Lubricants Co., Ltd., Nanjing 211100, China |
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Abstract: | Isothermal and isochronal annealing was conducted to study the thermal stability of the nanocrystalline in the surface layer of Mg alloy AZ91D induced by high-energy shot peening (HESP). Field emission scanning electron microscope (FESEM) and X-ray diffractometer were used to characterize the microstructure. Results showed that nanocrystalline produced by HESP on the surface layer of the magnesium alloy AZ91D was 60-70 nm on average. The nanocrystalline could remain stable at about 100 ℃, and grew up slowly between 100 ℃ and 200 ℃. When the annealing temperature reached 300 ℃, the growth rate of the nanocrystalline increased significantly. The kinetic coefficient n of the nanocrystalline growth was calculated to be 2-3 and the grain growth activation energy Q=39.7 kJ/mol, far less than the self-diffusion activation energy of magnesium atoms in the coarse polycrystalline material. |
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Keywords: | high energy shot peening (HESP) magnesium alloy AZ91D nanocrystalline thermal stability |
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