Preparation Mechanism of Fine-Grained Magnesium Alloys by Accumulative Alternating Back Extrusion
| Autor: | Wen Bin Fang, Ye Wang, Feng Li, Xue Wen Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Magnesium Metallurgy 0211 other engineering and technologies General Engineering Recrystallization (metallurgy) chemistry.chemical_element 02 engineering and technology equipment and supplies 021001 nanoscience & nanotechnology Microstructure Grain size chemistry General Materials Science Extrusion Magnesium alloy 0210 nano-technology Crystal twinning 021102 mining & metallurgy Electron backscatter diffraction |
| Zdroj: | JOM. 72:2578-2585 |
| ISSN: | 1543-1851 1047-4838 |
| Popis: | Fine grain modification is an important means for preparing lightweight and low-plasticity materials, including magnesium alloys. This paper proposes an accumulative alternating back extrusion (AABE) technique for preparing magnesium alloy materials. Metallographic microscopy and electron backscatter diffraction were used to test the resulting magnesium alloy samples and indicated that AABE can effectively refine microstructure and improve uniformity in local areas of the sample. After one pass of AABE, the upper part of the specimen was mainly characterized by recrystallization, with a high degree of refinement. The lower part showed coexisting recrystallization refinement and twinning refinement, which are less preferable. The mean grain size after applying five passes of AABE was half that of the samples subjected to only one pass. AABE is a novel and effective method for preparing high-performance magnesium alloy materials. |
| Databáze: | OpenAIRE |
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