采用CO2激光熔覆技术在AISI 1045钢基底上制备了 AlxCrFeCoCuNi 涂层.通过改变 Al 的含量来研究其对显微组织和耐磨性能的影响.涂层的微观结构、化学成分和相结构分别通过扫描电镜、能谱和X射线衍射进行了分析.研究结果表明,Alx CrFeCoCuNi 高熵合金涂层主要包括熔覆层、结合区和热影响区.熔覆层和基底具有很好的冶金结合.熔覆层主要由等轴晶和柱状晶组成.XRD 分析可知,由于高熵效应使得 Alx CrFe-CoCuNi高熵合金涂层相结构主要为简单面心和体心立方结构.AlxCrFeCoCuNi 的表面硬度最高可以达到758 Hv,是基底的3倍,而且显微硬度随着Al含量的增加而升高.Al 含量高的涂层具有高的硬度,从而提高了耐磨性能.
The Alx CrFeCoCuNi high entropy alloys (HEA)were prepared by laser cladding.Al contents were adj usted for further investigating the effect on wear resistance of sample.The microstructure,chemical compo-sition and phase analyses of the cladding layer were studied by scanning electron microscopy,EDS analysis,and X-ray diffraction measurement.The result shows that,Alx CrFeCoCuNi HEA samples consist of the cladding zone,bounding zone and heat affected zone.The bounding between cladding layer and the substrate of a good combination;the cladding zone is composed mainly of axis crystal and columnar crystals.The Alx CrFeCoCuNi HEA coating phase structure simple (FCC and BCC structure)due to high-entropy effect.The surface micro-hardness of AlxCrFeCoCuNi HEA samples up to 758 Hv,about 3 times as the substrate,and the hardness in-creases with increasing Al content.The high Al content gives a large improvement in wear resistance due to its high hardness.So the coating can play a good protective role on substrate AISI 1045 steel.
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