Journal Published Online: 20 October 2017
Volume 46, Issue 2

Effect of Aluminum Content on Interfacial Reaction of Directionally Solidified TiAl Alloys

CODEN: JTEVAB

Abstract

High Nb-containing TiAl alloys with different aluminum content were prepared by vacuum induction casting technology, and then processed via directional solidification in a Y2O3-coated Al2O3 crucible. The effect of aluminum content on the metal and coating interface, chemical composition, and phases at the interfaces were evaluated. The variations of microhardness of the samples from surface to interior were presented. The results showed that there is no significant difference between the matrix structure of TiAl alloy with different aluminum content. Nevertheless, with increasing aluminum content in the melt, the thickness of the reaction layer decreased. Moreover, the elements diffusion distance and hardness also showed an apparent decrease with the increasing of aluminum content. Besides inherent phases in the melt, simultaneous precipitation of Al2O3 particles also occurred.

Author Information

Cheng, C.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Sui, Y.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Feng, K.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Qi, J.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
He, Y.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Meng, Q.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Wei, F.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Sun, Z.
School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou, China
Pages: 8
Price: $25.00
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Stock #: JTE20160307
ISSN: 0090-3973
DOI: 10.1520/JTE20160307