高温合金中硼化物精细结构的高空间分辨电子显微学研究
作者简介 马秀良,男,1964年生,研究员,博士
收稿日期: 2018-07-23
网络出版日期: 2018-08-21
基金资助
国家重点基础研究发展计划项目Nos.2009CB623705和 2010CB631206,以及国家自然科学基金项目No.11327901
High-Resolution Transmission Electron Microscopic Study of Various Borides Precipitated in Superalloys
Received date: 2018-07-23
Online published: 2018-08-21
Supported by
Supported by National Basic Research Program of China (Nos.2009CB623705 and 2010CB631206) and National Natural Science Foundation of China (No.11327901)
为了提高高温服役性能,微量元素B被广泛加入到几乎所有的商用高温合金中。研究人员普遍认为B倾向于在晶界偏析,这种偏析有助于抑制高温下晶界的迁移。B在高温合金中有2种存在形式,一种是以固溶形式存在,另一种是以硼化物析出相的形式出现。B在高温合金中的固溶度非常低,故在高温服役过程中会析出多种硼化物,如M2B、M3B2和M5B3。尽管这些硼化物在高温合金中普遍存在,但人们对于其认识仍停留在形貌特征等相对宏观的尺度上。而基于这些析出相精细结构的深入认识有助于人们优化材料设计及合理的阐述结构-性能关系。近年来,基于像差校正电子显微技术,本课题组利用多种先进的电子显微学方法在原子尺度上对以上3种硼化物进行了系统的微结构解析。本文概述了硼化物的研究现状,系统介绍了对硼化物结构与缺陷的新认识,并展望了相关研究趋势。
马秀良 , 胡肖兵 . 高温合金中硼化物精细结构的高空间分辨电子显微学研究[J]. 金属学报, 2018 , 54(11) : 1503 -1524 . DOI: 10.11900/0412.1961.2018.00342
Microelement B is widely added into almost all commercial superalloys because B contributes to strengthening grain boundaries at high temperature during service. Generally, B is present in two different forms. Besides the solute state in matrix, B tends to react with transition elements at high temperatures, giving rise to various borides including M2B, M3B2 and M5B3 phases. An accurate knowledge of the microstructural characterizations of these borides is of great importance for a better understanding of the structure-property relationship and designing materials with improved properties. By means of various advanced techniques based on the aberration-corrected transmission electron microscopy (TEM), microstructural features of above borides have been systematically investigated. Various defect features which were controversial in the past have been clarified. In this paper, after a brief review on the studies of borides, the atomic-scale information on the microstructural features has been presented. Finally, some prospects for future studies have been proposed.
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