Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy
Modern magnesium-based alloys are broadly used in various industries as well as for biodegradable medical implants due to their exceptional combination of light weight, strength, and plasticity. The studied ZEK100 alloy had a nominal composition of 1 wt.% zinc, 0.1 wt.% zirconium, and 0.1 wt.% rare...
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MDPI AG
2023-10-01
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| author | Boris Straumal Natalya Khrapova Aleksandr Druzhinin Kristina Tsoy Gregory Davdian Valery Orlov Gregory Gerstein Alexander Straumal |
| author_facet | Boris Straumal Natalya Khrapova Aleksandr Druzhinin Kristina Tsoy Gregory Davdian Valery Orlov Gregory Gerstein Alexander Straumal |
| author_sort | Boris Straumal |
| collection | DOAJ |
| description | Modern magnesium-based alloys are broadly used in various industries as well as for biodegradable medical implants due to their exceptional combination of light weight, strength, and plasticity. The studied ZEK100 alloy had a nominal composition of 1 wt.% zinc, 0.1 wt.% zirconium, and 0.1 wt.% rare earth metals (REMs) such as Y, Ce, Nd, and La, with the remainder being Mg. It has been observed that between the solidus (<i>T</i><sub>s</sub> = 529.5 ± 0.5 °C) and liquidus temperature (<i>T</i><sub>l</sub> = 645 ± 5 °C), the Mg/Mg grain boundaries can contain either the droplets of a melt (incomplete or partial wetting) or the continuous liquid layers separating the abutting Mg grains (complete wetting). With the temperature increasing from <i>T</i><sub>s</sub> to <i>T</i><sub>l</sub>, the transformation proceeds from incomplete to complete grain boundary wetting. Below 565 °C, all grain boundaries are partially wetted by the melt. Above 565 °C, the completely wetted Mg/Mg grain boundaries appear. Their portion grows quickly with an increasing temperature until reaching 100% at 622 °C. Above 622 °C, all the solid Mg grains are completely surrounded by the melt. After rapid solidification, the REM-rich melt forms brittle intermetallic compounds. The compression strength as well as the compression yield strength parameter <i>σ</i><sub>02</sub> strongly depend on the morphology of the grain boundary layers. If the hard and brittle intermetallic phase has the shape of separated particles (partial wetting), the overall compression strength is about 341 MPa and <i>σ</i><sub>02</sub> = 101 MPa. If the polycrystal contains the continous intergarnular layers of the brittle intermetallic phase (complete wetting), the overall compression strength drops to 247 Mpa and <i>σ</i><sub>02</sub> to 40 Mpa. We for the first time observed, therefore, that the grain boundary wetting phenomena can strongly influence the mechanical properties of a polycrystal. Therefore, grain boundary wetting can be used for tailoring the behavior of materials. |
| first_indexed | 2024-03-09T16:54:34Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
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| spelling | doaj.art-3ecd601ec9344d60b6d8d66bbb70a1942023-11-24T14:36:37ZengMDPI AGCrystals2073-43522023-10-011311153810.3390/cryst13111538Grain Boundary Wetting Transition in the Mg-Based ZEK 100 AlloyBoris Straumal0Natalya Khrapova1Aleksandr Druzhinin2Kristina Tsoy3Gregory Davdian4Valery Orlov5Gregory Gerstein6Alexander Straumal7Osipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, The Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaInstitute for Material Science, Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, GermanyDepartment of Materials for Agrotechnology, Cotton Breeding, Seed Production and Agrotechnologies Research Institute, University Str. 3, Salar, Tashkent 702147, UzbekistanModern magnesium-based alloys are broadly used in various industries as well as for biodegradable medical implants due to their exceptional combination of light weight, strength, and plasticity. The studied ZEK100 alloy had a nominal composition of 1 wt.% zinc, 0.1 wt.% zirconium, and 0.1 wt.% rare earth metals (REMs) such as Y, Ce, Nd, and La, with the remainder being Mg. It has been observed that between the solidus (<i>T</i><sub>s</sub> = 529.5 ± 0.5 °C) and liquidus temperature (<i>T</i><sub>l</sub> = 645 ± 5 °C), the Mg/Mg grain boundaries can contain either the droplets of a melt (incomplete or partial wetting) or the continuous liquid layers separating the abutting Mg grains (complete wetting). With the temperature increasing from <i>T</i><sub>s</sub> to <i>T</i><sub>l</sub>, the transformation proceeds from incomplete to complete grain boundary wetting. Below 565 °C, all grain boundaries are partially wetted by the melt. Above 565 °C, the completely wetted Mg/Mg grain boundaries appear. Their portion grows quickly with an increasing temperature until reaching 100% at 622 °C. Above 622 °C, all the solid Mg grains are completely surrounded by the melt. After rapid solidification, the REM-rich melt forms brittle intermetallic compounds. The compression strength as well as the compression yield strength parameter <i>σ</i><sub>02</sub> strongly depend on the morphology of the grain boundary layers. If the hard and brittle intermetallic phase has the shape of separated particles (partial wetting), the overall compression strength is about 341 MPa and <i>σ</i><sub>02</sub> = 101 MPa. If the polycrystal contains the continous intergarnular layers of the brittle intermetallic phase (complete wetting), the overall compression strength drops to 247 Mpa and <i>σ</i><sub>02</sub> to 40 Mpa. We for the first time observed, therefore, that the grain boundary wetting phenomena can strongly influence the mechanical properties of a polycrystal. Therefore, grain boundary wetting can be used for tailoring the behavior of materials.https://www.mdpi.com/2073-4352/13/11/1538magnesium alloywettinggrain boundaryphasestransitions |
| spellingShingle | Boris Straumal Natalya Khrapova Aleksandr Druzhinin Kristina Tsoy Gregory Davdian Valery Orlov Gregory Gerstein Alexander Straumal Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy Crystals magnesium alloy wetting grain boundary phases transitions |
| title | Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy |
| title_full | Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy |
| title_fullStr | Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy |
| title_full_unstemmed | Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy |
| title_short | Grain Boundary Wetting Transition in the Mg-Based ZEK 100 Alloy |
| title_sort | grain boundary wetting transition in the mg based zek 100 alloy |
| topic | magnesium alloy wetting grain boundary phases transitions |
| url | https://www.mdpi.com/2073-4352/13/11/1538 |
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