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Crystallization, phase evolution and corrosion of Fe-based metallic glasses: An atomic-scale structural and chemical characterization study

机译：铁基金属玻璃的结晶，相演变和腐蚀：原子级结构和化学表征研究

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摘要

Understanding phase changes, including their formation and evolution, is critical for the performance of functional as well as structural materials. We analyze in detail microstructural and chemical transformations of the amorphous steel Fe50Cr15Mo14C15B6 during isothermal treatments at temperatures ranging from 550 to 800 degrees C. By combining high-resolution transmission electron microscopy and Rietveld analyses of X-ray diffraction patterns together with the local chemical data obtained by atom probe tomography, this research provides relevant information at the atomic scale about the mechanisms of crystallization and the subsequent phases evolution. During the initial stages of crystallization a stable (Fe,Cr)(23)(C,B)(6) precipitates as well as two metastable intermediates of M-3(C,B) and the intermetallic chi-phase. When full crystallization is reached, only a percolated nano-scale Cr-rich (Fe,Cr)(23)(C,B)(6) and Mo-rich eta-Fe3Mo3C structure is detected, with no evidence to suggest that other phases appear at any subsequent time. Finally, the corrosion behavior of the developed phases is discussed from considerations of the obtained atomic information. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
机译：了解相变，包括其形成和演化，对于功能材料和结构材料的性能至关重要。我们详细分析了550至800摄氏度温度下等温处理过程中非晶钢Fe50Cr15Mo14C15B6的组织和化学转变。通过结合高分辨率透射电子显微镜和X射线衍射图的Rietveld分析以及获得的局部化学数据通过原子探针层析成像，这项研究在原子尺度上提供了有关结晶机理和后续相演化的相关信息。在结晶的初始阶段，会析出稳定的（Fe，Cr）（23）（C，B）（6）以及M-3（C，B）和金属互化物的两个亚稳中间体。当达到完全结晶时，仅检测到渗滤的纳米级富铬（Fe，Cr）（23）（C，B）（6）和富钼的eta-Fe3Mo3C结构，没有证据表明存在其他相在随后的任何时间出现。最后，从获得的原子信息的角度讨论了已开发相的腐蚀行为。 （C）2014 Acta Materialia Inc.，由Elsevier Ltd.发行。保留所有权利。

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