Effect of niobium alloying level on the oxidation behavior of titanium aluminides at 850°C

作     者：Alexandra Banu Maria Marcu Simona Petrescu Nicolae Ionescu Alexandru Paraschiv 无

作者机构：Faculty of Engineering and Management of Technological SystemsPolitehnica University of BucharestSplalul Independentei 313060032Bucharest060042Romania Department of Electrochemistry and CorrosionInstitute of Physical Chemistry'Ilie Murgulescu'Splaiul Independentei 202Bucharest060021Romania Department of Gas Turbines Special ComponentsCOMOTI-R&D Romanian InstituteBd Iuliu Maniu 220061126BucharestRomania 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2016年第23卷第12期

页      面：1452-1457页

核心收录：

学科分类：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：funded by National Project PCCA contract No.65/2012 POS-CCE O 2.2.1 project INFRANANOCHEM-No 19/January 3,2009 of the EU(ERDF)and Romanian Government 

主　　题：titanium aluminide thermal oxidation oxidation resistance niobium alloying 

摘      要：This work addresses the alloying of titanium aluminides used in aircraft engine applications and automobiles. The oxidation resistance behavior of two titanium aluminides of α2 ＋ γ （Ti3Al ＋ TiAl） and orthorhombic Ti2NbAl, recognized as candidates for high-temperature applications, was investigated by exposure of the alloys for 100 h in air. Thus, oxidation resistance was expressed as the mass gain rate, whereas surface aspects were analyzed using scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy, and the type of oxidation products was analyzed by X-ray diffraction and Raman spectroscopy. The orthorhombic Ti2NbAl alloy was embrittled, and pores and microcracks were formed as a result of oxygen diffusion through the external oxide layer formed during thermal oxidation for 100 h.