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Fabrication and mechanical properties of network structured titanium alloy matrix composites reinforced with Ti_2AlC particulates

机译：Ti_2AlC颗粒增强的网络结构钛合金基复合材料的制备及力学性能

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摘要

Network structured Ti-6.5Al-2Zr-1Mo-1V (TA15) matrix composites reinforced with Ti_2AlC particles were fabricated by low energy ball milling and subsequent spark plasma sintering (SPS). Microstructures, mechanical properties, and wear resistance properties of the composites were evaluated as a function of Ti_2AlC weight fraction. Experimental results showed that the fine Ti_2AlC powders were adhered on the surface of the spherical TA15 powders after low-energy milling process and Widmanstatten α+β microstructure with a network architecture was formed after SPS. The Ti_2AlC reinforcements were reacted with Ti matrix and formed a Ti_3AlC phase at the interface. The hardness, tensile, and compressive strength of the TA15/Ti_3AlC composites show significant improvement with less ductility loss. The TA15/1.0 wt% Ti_2AlC exhibited tensile yield strength of 929 MPa and ultimate tensile strength of 1013 MPa with ductility of 13.06%. The TA15/Ti_3AlC composites had a lower friction coefficient and decreased wear rate with delamination and abrasive wear modes.
机译：通过低能球磨和随后的火花等离子体烧结（SPS），制备了由Ti_2AlC颗粒增强的网络结构Ti-6.5Al-2Zr-1Mo-1V（TA15）基复合材料。评价了复合材料的微观结构，机械性能和耐磨性能，并将其作为Ti_2AlC重量分数的函数。实验结果表明，Ti_2AlC细粉经低能研磨后附着在球形TA15粉末表面，SPS形成了具有网状结构的Widmanstattenα+β微结构。 Ti_2AlC增强材料与Ti基体反应并在界面处形成Ti_3AlC相。 TA15 / Ti_3AlC复合材料的硬度，拉伸强度和抗压强度显示出显着的改善，而延展性损失较小。 TA15 / 1.0 wt％Ti_2AlC的拉伸屈服强度为929 MPa，极限拉伸强度为1013 MPa，延展性为13.06％。 TA15 / Ti_3AlC复合材料具有较低的摩擦系数，并具有分层和磨料磨损模式，降低了磨损率。

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