激光加工Ti6Al4V基复合材料的显微组织、硬度和耐腐蚀性能（英文）

发布时间：2018-05-14 09:48

本文选题：TiAlV基复合材料 + Nb　；参考：《Transactions of Nonferrous Metals Society of China》2015年09期

【摘要】：在不同功率下将Nb和Ti-13Nb粉末进行激光沉积,以改善Ti6Al4V合金的表面性能。采用扫描电镜(附带EDS能谱仪)和光学显微镜对样品进行表征,采用X射线衍射仪分析样品的元素组成及相组成,获得样品的硬度、磨损和耐腐蚀性能。在Hanks溶液(模拟体液)中研究沉积层的腐蚀和磨损行为。显微组织观察结果表明,沉积的Nb层为斜方晶系的树枝状α″和亚稳态β-Nb相,其硬度分布不均匀,平均硬度为HV 364;沉积的Ti-13Nb层为马氏体α′和亚稳态β-Nb相,其平均硬度为HV 423。干滑动摩擦条件下Ti-13Nb层的耐磨损性能归因于其硬度的增加。实验结果表明,在Ti6Al4V基体上沉积Nb和Ti-13Nb极大地降低了各层中Al和V的含量。在模拟体液中,与基体相比,Nb增强复合材料具有最好的耐磨损和耐腐蚀性能。因此,此复合材料将对改善整形外科植入材料性能发挥最佳作用。
[Abstract]:NB and Ti-13Nb powders were deposited by laser at different power to improve the surface properties of Ti6Al4V alloy. The samples were characterized by scanning electron microscope (with EDS energy spectrometer) and optical microscope. The element composition and phase composition of the samples were analyzed by X-ray diffractometer. The hardness, wear and corrosion resistance of the samples were obtained. The corrosion and wear behavior of the deposit was studied in Hanks solution (simulated body fluid). The results of microstructure observation show that the deposited NB layer is dendritic 伪 "and metastable 尾 -Nb phase of oblique crystal system, its hardness distribution is uneven, the average hardness is HV364, and the deposited Ti-13Nb layer is martensite 伪 'and metastable 尾 -Nb phase, its average hardness is HV42323. The wear resistance of Ti-13Nb layer under dry sliding friction is attributed to the increase of hardness. The experimental results show that the deposition of NB and Ti-13Nb on the Ti6Al4V substrate greatly reduces the Al and V contents in each layer. In simulated body fluid, Nb-reinforced composites have the best wear and corrosion resistance compared with the matrix. Therefore, the composite will play an optimal role in improving the performance of plastic surgery implants.
【作者单位】： Department
【基金】：financially supported by the National Research Foundation of South Africa The National Laser Centre,CSIR,Pretoria,South Africa,is appreciated for laser facility the support from Tshwane University of Technology,South Africa
【分类号】：TG665

【共引文献】