STUDY ON CYCLIC OXIDATION RESISTANCE OF  HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM

doi:10.3724/SP.J.1037.2013.00394

Acta Metall Sin

2013, Vol. 49

Issue (11): 1369-1373 DOI: 10.3724/SP.J.1037.2013.00394

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STUDY ON CYCLIC OXIDATION RESISTANCE OF HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM

GONG Ziqi, CHEN Ziyong, CHAI Lihua, XIANG Zhilei, NIE Zuoren

Department of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

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GONG Ziqi, CHEN Ziyong, CHAI Lihua, XIANG Zhilei, NIE Zuoren. STUDY ON CYCLIC OXIDATION RESISTANCE OF HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM. Acta Metall Sin, 2013, 49(11): 1369-1373.

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Abstract

Ti－46Al－8Nb and Ti－46Al－8Nb－0.1Er alloys were prepared by the cold crucible induction levitation melting method. The oxidation behavior experiment was done in air at 900℃ up to one hundred times. Based on the oxidation kinetic analysis and the phase constitution, microstructure and the interface of the oxidation film and the matrix were investigated by means of XRD and SEM equipped with EDS, the cyclic oxidation resistance of TiAl based alloys was explored. The results showed that no spallation of layer occurs in both alloys, and Ti－46Al－8Nb－0.1Er comparing with Ti－46Al－8Nb exhibits more excellent oxidation resistance, oxides formed on the surface consist of mainly Al₂O₃, the continuous compact oxidation film with a good combination with the matrix significantly decreases the oxidation rate, the mass gain and the oxide film thickness. The addition Er purifies the alloy matrix and prevents the inward diffusion of oxygen atoms, thereby improves the cyclic oxidation resistance of TiAl based alloy.

Key words: TiAl cyclic oxidation Er oxide layer

Received: 10 July 2013

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	GONG Ziqi
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00394 OR https://www.ams.org.cn/EN/Y2013/V49/I11/1369

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