TiNiSMA丝增强AZ31镁合金复合材料的制备及性能

Preparation and Properties of TiNi SMA Reinforced AZ31 Magnesium Matrix Composite

摘要:

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结构及力学性能。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力学性能优于室温,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61MPa、41MPa和6.05GPa,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39MPa、72MPa和12.19GPa。

Abstract:

Magnesium matrix composite was fabricated by vacuum hot pressing technique utilizingTiNishape memory alloy as reinforcement and AZ31 plate as matrix. The microstructure and mechanical properties of the composites at room temperature and elevated temperature were studied by optical microscope, SEM, EDS, DSC and tensile test. The results show：The interfacial bonding of the composites was good. The Mg element in the matrix and the Ti and Ni elements in the TiNi alloy diffused to form an interdiffusion layer of about 1 μm. The mechanical properties of the composites at elevated temperature were better than those at room temperature. The yield strength, tensile strength and elastic modulus of the composites were increased by 61MPa、41MPa and 6.05GPa respectively at 100℃ than at room temperature. The yield strength, tensile strength and elastic modulus of the composites were increased by 39MPa、72MPaand 12.19GPa respectively at 150℃ than at room temperature.