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 

机构地区：[1]Faculty of Engineering and Management of Technological Systems,Politehnica University of Bucharest,Splalul Independentei 313,060032,Bucharest,060042,Romania [2]Department of Electrochemistry and Corrosion,Institute of Physical Chemistry'Ilie Murgulescu',Splaiul Independentei 202,Bucharest,060021,Romania [3]Department of Gas Turbines Special Components,COMOTI-R&D Romanian Institute,Bd Iuliu Maniu 220,061126,Bucharest,Romania

出　　处：《International Journal of Minerals,Metallurgy and Materials》2016年第12期1452-1457,共6页矿物冶金与材料学报（英文版）

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

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.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.

关 键 词：titanium aluminide thermal oxidation oxidation resistance NIOBIUM ALLOYING 

分 类 号：TG146.23[一般工业技术—材料科学与工程]