TiNi丝增强AZ31镁合金复合材料的制备及性能

Preparation and Properties of TiNi Alloy Wire Reinforced AZ31 Magnesium Matrix Composite

采用真空热压法制备了体积分数为12.8%的TiNi丝增强镁合金基复合材料,通过光学显微镜、SEM、EDS、DSC以及拉伸试验研究了复合材料的微观组织及拉伸性能。结果表明:制备的复合材料界面结合良好,基体中的Mg元素以及TiNi合金中的Ti、Ni元素均发生了扩散,形成约1μm的互扩散层。复合材料在高温条件下的拉伸性能优于室温,100℃下复合材料的屈服强度、抗拉强度和弹性模量比室温条件下分别提高了61 MPa、41 MPa和6.05 GPa,150℃下复合材料的屈服强度、抗拉强度和弹性模量比室温条件下分别提高了39 MPa、72 MPa和12.19 GPa。

Magnesium matrix composites were fabricated by vacuum hot pressing technique using TiNi shape memory alloy wire as the reinforcing material and AZ31 plate as the matrix. The microstructure and tensile properties of the composites at room temperature and elevated temperature were studied by optical microscope, SEM, EDS, DSC and tensile tests. The results show that the interface of the composites is well combined. The Mg element in the matrix and the Ti and Ni elements in the TiNi alloy diffuse to form an interdiffusion layer of about 1 μm in thickness. The composites have better tensile properties at elevated temperatures. Compared with those at room temperature, the yield strength, tensile strength and elastic modulus of the composites are increased by 61 MPa, 41 MPa and 6.05 GPa at 100 ℃ and 39 MPa, 72 MPa and 12.19 GPa at 150 ℃ respectively.