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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >MICROSTRUCTURES AND WEAR RESISTANCE OF LASER SURFACE ALLOYED NITI WITH HIGH MO CONCENTRATION
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MICROSTRUCTURES AND WEAR RESISTANCE OF LASER SURFACE ALLOYED NITI WITH HIGH MO CONCENTRATION

机译：高Mo浓度激光表面合金硝基的微观结构和耐磨性

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摘要

Nickel Titanium alloys are a unique class of materials which exhibit shape memory and superelastic properties. The interest in this material for medical applications, such as surgical implants, has been steadily growing in recent years. In the present study, NiTi (55%Ni-45%Ti) SMA were surface alloyed with molybdenum using a continuous wave Nd-YAG laser in Nitrogen shielding gas atmosphere, aiming at improving the surface hardness and in the mean time, enhancing its corrosion resistance. By optimizing the process parameters, an alloyed surface is obtained which has 300Hv increase in hardness as compared with the as received sample. A relatively high Mo content, with average of 30% Mo, in the alloyed zone is achieved for better surface properties. The cross-sections of the laser-treated specimens were examined by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffractometry (XRD). Vickers hardness test recorded a significant improvement in the surface hardness of specimen. Polarization curves consistently showed that the corrosion resistance was enhanced after laser surface alloying with Mo as compared with the untreated NiTi substrate.
机译：镍钛合金是一种独特的材料，具有形状记忆和超弹性性能。近年来，对医疗应用的这种材料的兴趣，如外科植入物，这一直稳步增长。在本研究中，Niti（55％Ni-45％Ti）SMA在氮气屏蔽气体气氛中使用连续波Nd-YAG激光器合金合金，旨在改善表面硬度并在平均时间增强其腐蚀反抗。通过优化工艺参数，与接受样品相比，获得合金表面的硬度增加300HV。为更好的表面性能实现了相对高的Mo含量，平均为30％Mo，在合金区域中实现。通过光学显微镜（OM），扫描电子显微镜（SEM），能量分散X射线光谱（EDS）和X射线衍射法（XRD）检查激光处理样本的横截面。维克斯硬度测试记录了样本表面硬度的显着改善。与未处理的Niti衬底相比，偏振曲线始终如一地表明，在用MO的激光表面合金化后，耐腐蚀性增强。

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