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| 热挤压对双尺度SiCp/AZ91镁基复合材料显微组织与拉伸性能的影响 |
| Microstructure and Tensile Properties of Bimodal Size SiCp/AZ91 Magnesium-Based Composite Influenced by Hot Extrusion |
| Received:January 12, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.03.007 |
| 中文关键词: 颗粒增强镁基复合材料 显微组织 力学性能 |
| 英文关键词: particle reinforced magnesium-based composite microstructure mechanical properties |
| 基金项目:国家自然科学基金(52001223，51771128，51771129) |
| Author Name | Affiliation | | WANG Cui-ju | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | SUN Xue-fei | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | NIE Kai-bo | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | DENG Kun-kun | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| 中文摘要: |
| 目的 细化SiCp/AZ91镁基复合材料基体晶粒，提高其拉伸强度。方法 基于半固态搅拌铸造的方法制备出双尺度SiCp/AZ91镁基复合材料(标记为M-9+S-1)。在不同温度下对M-9+S-1进行慢速挤压，研究挤压温度对其显微组织和力学性能的影响规律。结果 SiCp一方面能够促进DRX形核，使M-9+S-1复合材料基体晶粒得以显著细化;另一方面，能够促进大量细小Mg17Al12相的动态析出，显著提升热挤压后的性能。结论 M-9+S-1经250 ℃热挤压后，基于动态析出和动态再结晶的双重作用，拉伸性能得以显著提升，其中，屈服强度和抗拉强度可分别提升至~342 MPa和~380 MPa。 |
| 英文摘要: |
| To refine grain size and improve the tensile strength of the SiCp/AZ91 magnesium-based composite, the present work fabricated bimodal size SiCp/AZ91 magnesium-based composite (denoted as “M-9+S-1”) through semi-solid stir casting technology. After extruding M-9+S-1 at different temperature with low speed, its microstructure and tensile properties were investigated. The results indicate that the existence of SiCp can not only promote the nucleation of DRX and result in the obvious grain refinement of M-9+S-1 composite, but also is propitious to the dynamic precipitation of Mg17Al12 phase for the significant improvement of properties after hot extrusion. With the double effect of DRX and dynamic precipitation promoted SiCp, the tensile properties of M-9+S-1 composite are improved obviously after extrusion at 250 ℃, and the YS and UTS of which are improved to ~342 MPa and ~380 MPa, respectively. |
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