High temperature oxidation of Ti-46Al-6Nb-0.5W-0.5Cr-0.3Si-0.1C alloy

被引：35
作者：
Park, Soon Yong [1 ]
Seo, D. Y. [2 ]
Kim, Seong Woong [3 ]
Kim, Seung Eon [3 ]
Hong, Jae Keun [3 ]
Lee, Dong Bok [1 ]
机构：
[1] Sungkyunkwan Univ, Sch Adv Mat Sci & Engn, Suwon 16419, South Korea
[2] Natl Res Council Canada, Gas Turbine Mat Grp, Struct Mat & Mfg Lab, Aerosp Portfolio, Ottawa, ON K1A 0R6, Canada
[3] Korea Inst Mat Sci, Titanium Alloys Dept, Chang Won 51508, South Korea
来源：
INTERMETALLICS | 2016年 / 74卷
关键词：
Intermetallics (aluminides); Oxidation; Casting; Microstructure; Microscopy; various; Aerospace structures; TIAL ALLOYS; PHASE-TRANSFORMATIONS; HIGH-NB; BEHAVIOR; CR; INTERMETALLICS; RESISTANCE; NIOBIUM; AIR; SI;
D O I：
10.1016/j.intermet.2016.04.005
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A newly developed Ti-46Al-6Nb-0.5W-0.5Cr-0.3Si-0.1C alloy was oxidized isothermally and cyclically in air, and its high-temperature oxidation behavior was investigated. When the alloy was isothermally oxidized at 700 degrees C for 2000 h, the weight gain was only 0.15 mg/cm(2). The parabolic rate constant, k(p) (mg(2)/cm(4).h), measured from isothermal oxidation tests was 0.002 at 900 degrees C and 0.009 at 1000 degrees C. Such excellent isothermal oxidation resistance resulted from the formation of the dense, continuous Al2O3 layer between the outer TiO2 layer and the inner (TiO2-rich, Al2O3-deficient) layer. The alloy also displayed good cyclic oxidation resistance at 900 degrees C. Some noticeable scale spallation began to occur after 68 h at 1000 degrees C during the cyclic oxidation test. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：8 / 14
页数：7
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