高强AZ61Mg‒18%Ti复合材料的制备及力学性能

Fabrication and mechanical properties of high-strength AZ61Mg‒18%Ti composites

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.