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哈氏合金Hastelloy C276是一种被广泛应用的镍基合金,具有机械性能优良、抗腐蚀能力强等优势,在第二代高温超导导线的离子束辅助沉积(IBAD)技术路线中被用作金属基底,因此其表面抛光与粗糙度测量受到了广泛重视。哈氏合金的表面形貌和粗糙度测量一般采用原子力显微镜(AFM)方法,在该方法中扫描尺度对测量结果具有显著的影响。本研究对两个分别进行了电化学抛光和机械抛光的哈氏合金带材短样,在1~70μm范围内选取不同扫描尺度进行了AFM测量,从而对其表面形貌获得了全面的了解,并发现其表面粗糙度随着扫描尺度的变大出现了明显的增大,文中还在不同扫描尺度下考察了电化学抛光与机械抛光的作用区别。此外,本研究中分析了AFM图像的后处理中flatten阶数的影响,对从AFM图像中分割出小尺度局域计算粗糙度的方法进行了改进,并讨论了AFM测量粗糙度的可重复性问题。通过这些研究,对表面粗糙度的AFM测量方法在全面性和有效性方面进行了完善,提出了粗糙度描述时有必要给出的相关参数。
Hastelloy C276 Hastelloy C276 is a widely used nickel-based alloy with excellent mechanical properties and corrosion resistance. It is used as an ion beam assisted deposition (IBAD) technology route for the second generation HTS wire Metal substrate, so its surface roughness and roughness measurement has received extensive attention. Hastelloy surface morphology and roughness measurements generally use atomic force microscopy (AFM) method, in which the scanning scale has a significant impact on the measurement results. In this study, two short strips of Hastelloy strip, which were respectively electrochemically polished and mechanically polished, were measured by AFM with different scanning scales in the range of 1 ~ 70μm, and the surface morphology was fully understood. The results show that the surface roughness increases obviously with the increase of the scanning scale, and the difference between electrochemical polishing and mechanical polishing is also investigated under different scanning scales. In addition, the influence of flatten order in AFM image postprocessing is analyzed in this study. The method of segmentation of small-scale local area roughness from AFM image is improved, and the repeatability of AFM measurement roughness is discussed problem. Through these studies, the surface roughness of the AFM measurement method in the comprehensive and effective aspects of the improvement has been made to describe the roughness necessary parameters are given.