Nowik Krzysztof, Zybała Rafał, Oksiuta Zbigniew
Institute of Mechanical Engineering, Faculty of Mechanical Engineering, Białystok University of Technology, Wiejska 45C, 15-351 Białystok, Poland.
Łukasiewicz Research Network-Institute of Microelectronics and Photonics, Al. Lotników 32/46, 02-668 Warsaw, Poland.
Materials (Basel). 2023 Jan 12;16(2):765. doi: 10.3390/ma16020765.
Ferritic ODS steel elemental powder compositions with various Zr content (0.3-1.0 wt.%), ground in a Pulverisette 6 planetary ball mill, were extensively studied by X-ray diffraction line profile analysis, microscopic observations, microhardness testing and particle size measurements. A characteristic three-stage process of flattening the soft powders, formation of convoluted lamellae and, finally, formation of nanocrystalline grains was observed. In order to quantify the microstructural properties, expressed mainly in terms of crystallite size and dislocation density, a methodology for detailed and accurate microstructure analysis of nanosized and severely deformed materials was proposed by the Whole Powder Pattern Modelling (WPPM) approach. In the case of the proposed ODS alloy composition, the overlapping of Fe and Cr Bragg reflections makes the microstructure analysis certainly more complicated. The results showed that the microstructure of powders evolved towards the nanocrystalline state consisting of fine (diameter of ~15 nm) and narrowly dispersed domains, with extensive dislocation density exceeding 1016 m.
对在Pulverisette 6行星式球磨机中研磨的、具有不同Zr含量（0.3 - 1.0 wt.%）的铁素体氧化物弥散强化（ODS）钢元素粉末组合物，通过X射线衍射线轮廓分析、显微镜观察、显微硬度测试和粒度测量进行了广泛研究。观察到一个特征性的三阶段过程：软粉末扁平化、形成盘绕薄片，最后形成纳米晶粒。为了量化主要以微晶尺寸和位错密度表示的微观结构特性，通过全粉末图案建模（WPPM）方法提出了一种用于详细准确分析纳米尺寸和严重变形材料微观结构的方法。在所提出的ODS合金组合物的情况下，Fe和Cr布拉格反射的重叠使得微观结构分析肯定更加复杂。结果表明，粉末的微观结构向由细（直径约15 nm）且窄分布区域组成的纳米晶态演变，位错密度广泛超过1016 m 。
