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摘要: 通过机械球磨、真空热压和热挤压制备了AZ61Mg‒18%Ti（质量分数）复合材料，研究了复合材料的微观组织、室温力学性能和强化机制。结果表明，采用真空热压+热挤压制备的复合材料镁基体平均晶粒尺寸为180 nm，Ti颗粒及纳米级Ti3Al相弥散分布于镁基体中，Ti颗粒和Ti3Al相平均尺寸分别为265 nm和10 nm。超细晶AZ61Mg‒18%Ti复合材料具有优异的室温力学性能，其屈服强度、抗压强度和断裂应变分别达到606 MPa、698 MPa和12%。Abstract: The AZ61Mg‒18%Ti (mass fraction) composites were prepared by mechanical milling, vacuum hot pressing, and hot extrusion. The microstructure, room-temperature mechanical properties, and the corresponding strengthening mechanism were studied. The results show that, the average grain size of the magnesium matrix is about 180 nm, the Ti particles and the nano-sized Ti3Al phases are dispersive distribution in the magnesium matrix, and the average grain sizes of Ti particles and Ti3Al phases are 265 nm and 10 nm, respectively. The ultrafine-grained AZ61Mg‒18%Ti composites show the excellent room-temperature mechanical properties, the room-temperature yield strength, the compressive strength, and the fracture strain are 606 MPa, 698 MPa, and 12%, respectively.
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图 1 复合材料微观组织、尺寸分布及能谱分析：（a）复合粉末扫描电镜显微形貌；（b）复合粉末透射电镜显微形貌；（c）Ti单质粒子扫描电镜显微形貌；（d）Ti颗粒尺寸分布；（e）C点能谱分析；（f）D点能谱分析
Figure 1. Microstructure, size distribution, and energy dispersive spectrometer (EDS) analysis of the composites: (a) scanning electron microscope (SEM) image of the composite powders; (b) transmission electron microscope (TEM) image of the composite powders; (c) SEM image of Ti particle; (d) particle size distribution of Ti; (e) EDS analysis of point C; (f) EDS analysis of point D
图 2 真空热压和热挤压工艺示意图
Figure 2. Schematic diagram of the vacuum hot pressing and hot extrusion
图 3 不同状态AZ61Mg−18%Ti复合材料X射线衍射图谱
Figure 3. XRD patterns of the AZ61Mg−18%Ti composites in the various states
图 4 挤压态AZ61Mg−18%Ti复合材料微观组织（a）和Ti颗粒尺寸分布（b）
Figure 4. Microstructure (a) and Ti particle size distribution (b) of the as-extruded AZ61Mg−18%Ti composites
图 5 AZ61Mg‒18%Ti复合材料透射电镜显微组织形貌：（a）热压态显微形貌；（b）挤压态显微形貌；（c）挤压态高分辨显微形貌；（d）挤压态高分辨放大显微形貌
Figure 5. TEM images of the AZ61Mg‒18%Ti composites: (a) the hot pressed; (b) the extruded; (c) the HTEM images as extruded; (d) the amplification HTEM images as extruded
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