Room temperature compressive properties and strengthening mechanism of Mg_(96.17)Zn_(3.15)Y_(0.50)Zr_(0.18) alloy solidified under high pressure |
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| Affiliation: | 1. School of Materials and Engineering, Northeast University, Shenyang 110819, China;2. School of Resources and Materials, Northeast University at Qinhuangdao, Qinhuangdao 066004, China;3. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, China;1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, Shandong Polytechnic University, Jinan 250353, China;2. Key Laboratory of Amorphous and Polycrystalline Materials in Universities of Shandong, Shandong Polytechnic University, Jinan 250353, China;3. Instrumental Analysis Center, Shandong Polytechnic University, Jinan 250353, China;4. Section of Chemistry, Aalborg University, Aalborg DK-9000, Denmark;1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. School of Physics and Electronical Science, Chuxiong Normal University, Chuxiong 675000, China;3. Dean''s Office, Sichuan University of Arts and Science, Dazhou 635000, China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China;2. Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, PR China;2. Department of Physics, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, PR China |
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| Abstract: | The microstructures of Mg96.17Zn3.15Y0.50Zr0.18 alloys solidified under 2–6 GPa high pressure were investigated by employing SEM (EDS) and TEM. The strengthening mechanism of experimental alloy solidified under high pressure is also discussed by analyzing the compressive properties and compression fracture morphology. The results show that the microstructure of experimental alloy becomes significantly fine-grained with increasing GPa level high pressure during solidification process, and the secondary dendrite arm spacing reduces from 40 μm at atmospheric pressure to 10 μm at 6 GPa pressure. The morphology of the second phases changes from the net structure by the lamellar-type eutectic structure at atmospheric pressure to discontinuous thin rods or particles at 6 GPa pressure. Besides, the solid solubility of Zn in the Mg matrix is improved with the increase of the solidification pressure. Compared with atmospheric-pressure solidification, high-pressure solidification can improve the strength of the experimental alloy. The compressive strength is improved from 263 to 437 MPa at 6 GPa. The fracture mechanism of the experimental alloy changes from cleavage fracture at atmospheric pressure to quasi-cleavage fracture at high pressure. The main mechanism of the strength improvement of the experimental alloy includes the grain refinement strengthening caused by the refinement of the solidification microstructure, the second phase strengthening caused by the improvement of the morphology and distribution of the second phases, and solid solution strengthening caused by the increase of the solid solubility of Zn in the Mg matrix. |
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| Keywords: | High-pressure solidification Secondary dendrite arm spacing Solid solubility Rare earths |
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