FeCr<sub>15</sub>Ni<sub>15</sub>单晶600 ℃下热生长氧化膜的TEM观察

doi:10.11902/1005.4537.2019.155

中国腐蚀与防护学报

2019, Vol. 39

Issue (5): 417-422 DOI: 10.11902/1005.4537.2019.155

研究报告

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FeCr₁₅Ni₁₅单晶600 ℃下热生长氧化膜的TEM观察

魏欣欣^1,²,张波¹(

),马秀良¹

1. 中国科学院金属研究所沈阳 110016
2. 中国科学技术大学材料科学与工程学院合肥 230026

TEM Investigation to Oxide Scale Formed on Single Crystal Alloy FeCr₁₅Ni₁₅ at High Temperature

WEI Xinxin^1,²,ZHANG Bo¹(

),MA Xiuliang¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

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摘要:

利用透射电子显微镜 (TEM) 对FeCr₁₅Ni₁₅单晶在600 ℃下形成的氧化膜进行了系统的研究。结果表明，氧化膜分为内外两层，膜厚为4~6 μm。膜内层为富Fe、Cr的尖晶石氧化物，膜外层为富Fe、Ni的尖晶石氧化物。氧化膜内层具有晶体学面的各向异性，氧化膜沿着富Ni基体大量的 (111) 面外延生长，[110]_基体//[110]_氧化膜，(111)_基体//(111)_氧化膜。内层氧化膜的外侧区域较内侧区域氧化更充分，存在大量的面缺陷和Kirkendall效应留下的空洞，成为膜最疏松的区域。外层尖晶石氧化膜较为致密。

关键词 ：氧化膜, TEM, FeCr₁₅Ni₁₅单晶, 微观结构

Abstract：

The oxide scale formed on FeCr₁₅Ni₁₅ single crystal alloy at 600 ℃ for 20 h was characterized by means of transmission electron microscope. Results showed that the oxide scale of 4~6 μm in thickness was differentiated into two layers. The inner layer of the scale was spinel oxide rich in Fe and Cr, while the outer layer was spinel oxide rich in Fe and Ni. The region I of inner layer was anisotropy, of which oxides present epitaxial growth along a large amount of (111) plane of the matrix, i.e. [110]_matrix//[110]_ox, (111)_matrix//(111)_ox, however the region II and region III compose completely of oxides, while there exist a large number of surface defects and holes left by the kirkendall effect, which become the most porous area of the oxide scale, therefore, as a result, cracking and spalling off may certainly occur there. In the contrast, the outer layer of the oxide scale is dense one composed of polycrystalline spinel oxides.

Key words： oxide scale TEM FeCr₁₅Ni₁₅ single crystal microstructure

收稿日期: 2019-09-12

ZTFLH:

TG172

基金资助:国家自然科学基金(51771212);中国科学院金属研究所创新基金重点项目(2017-ZD05)

通讯作者: 张波 E-mail: bozhang@imr.ac.cn

Corresponding author: Bo ZHANG E-mail: bozhang@imr.ac.cn

作者简介: 魏欣欣，女，1992年生，博士生

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引用本文:

魏欣欣,张波,马秀良. FeCr₁₅Ni₁₅单晶600 ℃下热生长氧化膜的TEM观察[J]. 中国腐蚀与防护学报, 2019, 39(5): 417-422.
Xinxin WEI, Bo ZHANG, Xiuliang MA. TEM Investigation to Oxide Scale Formed on Single Crystal Alloy FeCr₁₅Ni₁₅ at High Temperature. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 417-422.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.155 或 https://www.jcscp.org/CN/Y2019/V39/I5/417

图1 FeCr15Ni15单晶 (110) 面上生长的氧化膜的HAADF-STEM像

图2 氧化膜的EDS成分分析

图3 氧化膜内层区域I的HAADF-STEM像

图4 图1中氧化膜内层区域I的EDS成分分析

图5 氧化膜内层区域I的HAADF-STEM高分辨像

图6 氧化膜内层区域II和区域III的HAADF-STEM像

图7 氧化膜外层的透射电镜观察

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