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首页> 外文期刊>Journal of Materials Engineering and Performance >Laser Processing of Titanium Aluminides
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Laser Processing of Titanium Aluminides

机译：铝钛合金的激光加工

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摘要

Using a Nd-YAG laser, laser processing of a series of Ti-Al alloys including pure Ti and Ti-Al intermetallic compounds has been studied. Scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), and optical microscopy were used to determine the surface morphological, chemical, and compositional characteristics of the laser-processed samples. Analysis of results showed that cracks along grain boundaries caused by rapid heating and cooling of laser processing were the dominant characteristics of the surface morphologies of the laser-processed samples. The Al content in the Ti-Al alloys played a very important role in crack initiation and/or development. The more Al content in the samples, the more severe the cracks that developed after laser processing under the same conditions. The experiments were conducted at ambient conditions, resulting in surface oxidation layers being observed on the processed samples. The XPS results indicated that the oxidation layer consisted of adsorbed O_2, Al_2O_3, TiO_2, and TiO. In addition, Al enrichment was found in the oxide film of TiAl as well as in the oxidation layers formed on the surfaces of TiAl and Ti_3Al intermetallics that were processed by the laser; this differs from the reported results for traditional oxidation of TiAl at elevated temperature.
机译：使用Nd-YAG激光，已经研究了一系列Ti-Al合金（包括纯Ti和Ti-Al金属间化合物）的激光加工。扫描电子显微镜（SEM），X射线光电子能谱（XPS）和光学显微镜用于确定激光加工样品的表面形态，化学和组成特征。结果分析表明，由激光加工的快速加热和冷却引起的沿晶界的裂纹是激光加工样品的表面形态的主要特征。 Ti-Al合金中的Al含量在裂纹萌生和/或发展中起着非常重要的作用。样品中的Al含量越高，在相同条件下进行激光加工后产生的裂纹越严重。实验在环境条件下进行，导致在处理过的样品上观察到表面氧化层。 XPS结果表明，氧化层由吸附的O_2，Al_2O_3，TiO_2和TiO组成。另外，在经过激光处理的TiAl的氧化膜以及在TiAl和Ti_3Al金属间化合物的表面上形成的氧化层中发现了Al富集;这与报道的高温下传统的TiAl氧化结果不同。

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