Oxidation behavior of two-phase γ+σ Nb-Ti-Al alloys

被引：2
|
作者：
Brady, M.P. [1 ]
Verink Jr., E.D. [2 ]
Smith, J.W. [3 ]
机构：
[1] Oak Ridge National Laboratory, Oak Ridge, TN 37831-6115, United States
[2] Dept. of Mat. Sci. and Engineering, University of Florida, Gainesville, FL 32611, United States
[3] NASA Lewis Research Center, Cleveland, OH 44135, United States
来源：
Oxidation of Metals | 1999年 / 51卷 / 05期
关键词：
Alumina - Binary alloys - Internal oxidation - Metallographic microstructure - Titanium nitride;
D O I：
10.1023/a:1018899412977
中图分类号：
学科分类号：
摘要：
The oxidation behavior of a series of single-and two-phase Nb-Ti-Al alloys, selected from the same extended γ+σ tie-line, was investigated at 1200 °C in air. The single-phase σ alloy suffered from extensive internal oxidation and oxidized at a much higher rate than the single-phase γ alloy. In a two-phase γ+σ microstructure, the γ phase was preferentially attacked to form `internal' alumina and Ti-rich nitride. This preferential attack of γ limited the extent to which the σ phase was internally oxidized, but also interrupted the formation of a continuous alumina scale. The single-phase γ alloy also did not form a continuous alumina scale. The inability of the γ phase to form continuous alumina was attributed to a combination of nitride formation and internal oxidation. The oxidation behavior of the two-phase γ+σ Nb-Ti-Al alloys is discussed in terms of mechanisms developed for the oxidation of binary, two-phase alloys.
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页码：539 / 556
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