High temperature oxidation behavior of directionally solidified NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho eutectic alloy

被引：12

作者：

Wang Zhen-sheng ^{[1
,2
]}

Xie Yi ^{[1
,3
]}

Guo Jian-ting ^{[1
]}

Zhou Lan-zhang ^{[1
]}

Hu Zhuang-qi ^{[1
]}

Zhang Guang-ye ^{[2
]}

Chen Zhi-gang ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Hunan Univ Sci & Technol, Coll Electromech Engn, Xiangtan 411201, Peoples R China

[3] Hunan Elect Power Corp Res Inst, Changsha 410007, Hunan, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 07期

基金：

中国国家自然科学基金;

关键词：

intermetallic compounds; NiAl; high temperature oxidation; directional eutectic alloy;

D O I：

10.1016/S1003-6326(11)61359-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The isothermal oxidation behavior of NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho directional eutectic alloy was investigated with the help of scanning electron microscopy and X-ray diffraction. The results revealed that a continuous Al2O3 scale was formed and owned excellent oxidation resistance in the temperature range of 900-1100 degrees C. When the temperature was up to 1150 degrees C, the continuous Al2O3 oxide film ruptured. Trace rare earth element Ho distributed uniformly in the alloy and relatively high level of Al in Cr(Mo) phase are beneficial to the formation of continuous and compact Al2O3 scale. During the oxidation, a phase transformation from theta-Al2O3 to alpha-Al2O3 existed on the surface of oxidation film. It resulted in the abnormal oxidation mass gain happening when the alloy was oxidized at 1000 degrees C or 1050 degrees C.

引用

页码：1582 / 1587

页数：6

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