Effect of Y2O3 addition on microstructure and properties of Ti6Al4V by laser melting deposition
Effect of Y2O3 addition on microstructure and properties of Ti6Al4V by laser melting deposition
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DOI：
10.1016/j.msea.2023.145694
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发表时间：
2023-09
期刊：
影响因子：
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通讯作者：
Wei Han;Jin Min;Guoqing Dai;Yanhua Guo;Lili Chang;Yaoqi Wang;Ertuan Zhao;Zhong-gang Sun;Hui Chang
中科院分区：
文献类型：
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作者：
Wei Han;Jin Min;Guoqing Dai;Yanhua Guo;Lili Chang;Yaoqi Wang;Ertuan Zhao;Zhong-gang Sun;Hui Chang
在增材制造（AM）过程中，y2o3颗粒作为成核位点，使钛合金的微观组织细化、均匀，有利于性能的提高。然而，要想获得良好的性能，必须掌握好y2o3的添加量。过量添加y2o3颗粒会导致尖端应力集中，增加材料断裂的概率，因此必须严格控制y2o3的添加量。我们尝试在Ti6Al4V的激光熔化沉积（LMD）过程中加入不同含量的y2o3颗粒。研究了Ti6Al4V-xY2O3（x = 0、0.1、0.5、0.9）合金的显微组织和性能。结果表明：Ti6Al4V-0.1 wt% y2o3的α-相尺寸明显减小；同时，y2o3作为核位活化，促进α-相等轴转变，具有良好的延展性。与Ti6Al4V合金相比，Ti6Al4V-0.1 wt% y2o3合金的屈服强度和抗拉强度分别提高了7.75%和10.27%。相应的延伸率由5.97%提高到11.53%。此外，y2o3对改善材料的摩擦学性能也有积极的作用。摩擦磨损试验表明，Ti6Al4V-0.5 wt% y2o3合金的耐磨性提高了3.6倍。本工作为提高Ti6Al4V合金的增材制造力学性能提供了新的方法和丰富的数据。
Y2O3particles act as nucleation sites in the additive manufacturing (AM) process of titanium alloy, making its microstructure refined and homogeneous, which is very beneficial for improving properties. However, obtaining good properties requires a good grasp of the amount of Y2O3addition. Excessive addition of Y2O3particles can lead to stress concentration at the tips, increasing the probability of material fracture, so the amount of Y2O3addition must be strictly controlled. We have attempted to add different contents of Y2O3particles during the laser melting deposition (LMD) of Ti6Al4V. The microstructure and properties of Ti6Al4V-xY2O3(x = 0,0.1,0.5,0.9) alloys were studied. The results show that the α-phase size of Ti6Al4V-0.1 wt% Y2O3significantly decreases. Meanwhile, Y2O3is activated as nucleation sites, promoting α-phase equiaxed transformation and providing excellent ductility. Compared with Ti6Al4V alloy, the yield strength and tensile strength of Ti6Al4V-0.1 wt% Y2O3alloy are increased by 7.75% and 10.27%, respectively. What's more, the corresponding elongation increased from 5.97% to 11.53%. In addition, Y2O3has a positive effect on improving the material's tribological properties. The friction and wear test shows that the wear resistance of Ti6Al4V-0.5 wt% Y2O3alloy is improved by 3.6 times. This work provides a new method and abundant data for improving the mechanical properties of Ti6Al4V alloy in AM.