Isothermal Oxidation Behavior of DZ125 Alloy

Li Yongquan; Li Jilin; Qin Chun; Dong Fuyuan; Li Xuan

doi:10.15980/j.tzzz.2018.04.001

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Isothermal Oxidation Behavior of DZ125 Alloy
Vol. 38, Issue 4, Pages: 349-352(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.04.001

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[1]李涌泉,李吉林,秦春,董福元,李轩.DZ125合金抗高温氧化性能研究[J].特种铸造及有色合金,2018,38(04):349-352.

Li Yongquan, Li Jilin, Qin Chun, et al. Isothermal Oxidation Behavior of DZ125 Alloy. [J]. Special Casting & Nonferrous Alloys 38(4):349-352(2018)
[1]李涌泉,李吉林,秦春,董福元,李轩.DZ125合金抗高温氧化性能研究[J].特种铸造及有色合金,2018,38(04):349-352. DOI： 10.15980/j.tzzz.2018.04.001.

Li Yongquan, Li Jilin, Qin Chun, et al. Isothermal Oxidation Behavior of DZ125 Alloy. [J]. Special Casting & Nonferrous Alloys 38(4):349-352(2018) DOI： 10.15980/j.tzzz.2018.04.001.

摘要

研究了DZ125合金在1 100℃时的氧化行为

分析了该合金表面氧化膜的生成和失效机制。结果表明

1 100℃氧化30h后DZ125合金表面氧化膜呈分层结构

其中外层为Cr

中间层为NiO及NiCr

内层为Al

。DZ125合金在1 100℃空气中的氧化动力学满足抛物线规律。在氧化过程中

聚集于晶界区域的Hf、Ta等高活性元素会优先发生氧化

为O的向内扩散提供通道

造成合金的选择性内氧化

并且随着氧化时间延长

氧化膜在应力的作用下开裂

最终导致膜层剥落失效。

Abstract

The oxidation behavior of DZ125 alloy at 1 100℃ was investigated

and the formation and failure mechanisms of the oxide film were evaluated.The results show that the oxide film formed on DZ125 alloy has a three-layer structure

mainly composed of a Cr

outer layer

a NiO and NiCr

middle layer and an Al

inner layer.The oxidation kinetics of DZ125 alloy at 1 100℃follows a parabolic law.During the oxidation process

high activity elements of Hf and Ta segregated at the grain boundaries of the alloy can be oxidized preferentially

which provide the inward diffusion path for oxygen and lead to the interior oxidation of the alloy.With the prolongation of oxidation time

the oxide film is cracked and failure under the action of stress.