The Effect of Ti on the Early Stages of Oxidation of an Alumina-Forming NiCrAl Alloy

被引：11

作者：

Barth, Talia L. ^{[1
]}

Marquis, Emmanuelle A. ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

OXIDATION OF METALS | 2019年 / 92卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

High-temperature oxidation; NiCrAl; Titanium; Electron microscopy; Atom probe tomography; HIGH-TEMPERATURE OXIDATION; SCALE FORMATION; BEHAVIOR; SEGREGATION; SUPERALLOY; ADDITIONS; PRESSURE; GROWTH; SI;

D O I：

10.1007/s11085-019-09911-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Model -NiCrAl alloys with and without titanium were oxidized for short times up to 32h at 1000 degrees C and subsequently characterized by scanning electron microscopy, transmission electron microscopy, and atom probe tomography in order to clarify the role of Ti on the oxidation behavior of alumina-forming nickel alloys. At the longer oxidation times, Ti was found to have no significant effect on the major protective oxide phases formed and overall scale and individual oxide layer thicknesses. Ti was observed to segregate to interfaces within the scale and form a Ti-rich oxide at the scale surface over time. At the shortest oxidation times before a continuous Al2O3 layer formed, the Ti-containing alloys exhibited thicker Cr2O3 layers, suggesting that Ti accelerates Cr2O3 growth kinetics. Additionally, oxide nodules resulting from fast oxidation of TiN particles were observed on the Ti-containing alloys. These may be linked to increased spalling propensity of Ti-containing alloys. [GRAPHCIS].

引用

页码：13 / 26

页数：14

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