The promoted formation of an α-Al2O3 scale on a nickel aluminide with surface Cr2O3 particles

被引：70
作者：
Huang, Y. [1 ,2 ]
Peng, X. [1 ,2 ]
机构：
[1] Univ Sci & Technol China, Coll Mat Sci & Engn, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2016年 / 112卷
基金：
中国国家自然科学基金;
关键词：
Metal coatings; Raman spectroscopy; SEM; Oxidation; OXIDATION BEHAVIOR; COATINGS; TRANSFORMATIONS; STRESS; ALLOY; ZR; AL;
D O I：
10.1016/j.corsci.2016.07.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A concept has been proposed that spreading particles of oxide (e.g., Cr2O3) with the same crystallographic structure as alpha-Al2O3 onto an alumina-forming aluminide can promote the growth of alpha-Al2O3 at high temperatures. This is in agreement with experimental observation that a Ni2Al3 experiences a theta-to-alpha. Al2O3 transformation while the Cr2O3-treated one only grows alpha-Al2O3 during oxidation in air at 1000 degrees C. The theta-alpha phase transformation bypassing by the surface Cr2O3 particles decreases the oxidation rate of the aluminide and prevents the phase-transformation-induced negative effects of the formation of microcracks in the alumina scale and cavities at the scale/metal interface. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：226 / 232
页数：7
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