Isothermal Oxidation Behavior of Dysprosium/S-Doped β-NiAl Alloys at 1200°C

作     者：Lu Wang Dongqing Li Jian Chang Hongbo Guo Shengkai Gong Huibin Xu 

作者机构：School of Materials Science and Engineering Beihang University AVIC Shenyang Liming Aero-engine Group Corporation Ltd. 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2014年第30卷第3期

页      面：229-233页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 51071013 and 51231001 the National Basic Research Program (973 Program) of China under Grant Nos. 2010CB631200 and 2012CB625100 

主　　题：NiAl Dy S Isothermal oxidation Phase transformation Segregation 

摘      要：A β--NiAI alloy with normal purity, a S-doped and a Dy and S co-doped （Y-NiAI alloys were prepared by arc-melting and their corresponding S contents were less than 20 ×10-6, 33 ×10-6 and 22 × 10-6, respectively. The isothermal oxidation behavior of the alloys at 1200 ℃ was investigated and the extent of S segregation at the scale-alloy interface was determined by scanning Auger microscopy. S-doping had no significant effect on the phase transformation rate from e- to β-Al2O3, while the addition of Dy retarded this process. For the S- doped alloy, scale rumpling occurred only after 2 h thermal exposure and numerous large voids were observed at the scale-alloy interface where S segregated. In contrast to this, the oxide scale formed on the Dy and S co-doped alloy still remained flat even after 50 h isothermal oxidation and only small voids existed at the interface where S segregation was not detected.