Synthesis of B2-RuAl coatings on mild steel by laser cladding

Synthesis of B2-RuAl coatings on mild steel by laser cladding
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激光熔覆在低碳钢上合成 B2-RuAl 涂层

DOI:
10.1016/j.surfcoat.2012.03.063
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发表时间:
2012
影响因子:
5.4
通讯作者:
F. Mücklich
F. Mücklich
中科院分区:
材料科学1区
文献类型:
--
作者:
B. Bax;C. Pauly;P. Leibenguth;K. Woll;F. Mücklich

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由于其优异的热力学、化学和机械性能,铝化钌经常被报道为未来应用的一个有趣的候选者。在这项工作中,使用500W二极管激光器将钌和铝的粉末混合物激光熔覆在低碳钢上。涂层的质量在很大程度上取决于激光加工过程中使用的参数。采用光学显微镜、x射线衍射、扫描电子显微镜、透射电子显微镜和原子探针层析成像技术对涂层的物相和微观结构进行了深入的研究。结果表明,该涂层由含有大量取代元素铁的B2-RuAl和α-Fe的混合物组成。多层叠加时,每增加一层,顶层α-相的含量显著降低。这是一种有潜力的方法,用于高温应用的涂层结构和快速成型单相铝组件,这是传统方法难以实现的。
Because of its outstanding thermodynamic, chemical and mechanical properties, ruthenium aluminide has often been reported to be an interesting candidate for future applications. In this work, powder mixtures of ruthenium and aluminium were laser cladded on mild steel using a 500W diode laser. The quality of the coatings depends strongly on the parameters used during the laser processing. The phases and microstructures of the resulting coatings were thoroughly investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and atom probe tomography. It was found that the coatings consist of a mixture of B2-RuAl with a high amount of iron as substitutional element and α-Fe. When superimposing several layers, the fraction of α-phase in the top layer decreases significantly with every additional layer. This is a potential method for coating structures for high-temperature applications and rapid prototyping single-phase RuAl components which are difficult to achieve by conventional methods.
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