Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys

Hong Zhong; Yanlong Yang; Jinshan Li; Jun Wang; Tiebang Zhang; Sheng Li; Ji Zhang

doi:10.1016/j.matlet.2012.06.013

Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys

Hong Zhong, Yanlong Yang, Jinshan Li, Jun Wang, Tiebang Zhang, Sheng Li, Ji Zhang

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The influence of oxygen on solidification microstructure of high Nb containing TiAl alloys with peritectic liquid composition was experimentally investigated. Alloys with oxygen content from 0.1 to 1.0 at.% were prepared by non-consumable vacuum arc remelting under protective atmosphere. Results indicate that increasing oxygen content in Ti-56Al-10Nb-xO alloys remarkably increases the amount of α ₂ phase, and shifts the peritectic reaction α + L → γ to a higher Al content. In Ti-54Al-8Nb-xO alloys, the mixed dendritic microstructure forms. The fine dendrites show peritectic halos and coarse dendrites consist of lamellae. The mixed dendritic microstructure has been interpreted by the stabilizing effect of oxygen on α phase and lamellar structure in high Nb containing TiAl alloys.

Original language	English
Pages (from-to)	198-201
Number of pages	4
Journal	Materials Letters
Volume	83
DOIs	https://doi.org/10.1016/j.matlet.2012.06.013
State	Published - 15 Sep 2012

Keywords

Microstructure
Phase transformation
Solidification
Titanium aluminides

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10.1016/j.matlet.2012.06.013

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title = "Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys",

abstract = "The influence of oxygen on solidification microstructure of high Nb containing TiAl alloys with peritectic liquid composition was experimentally investigated. Alloys with oxygen content from 0.1 to 1.0 at.% were prepared by non-consumable vacuum arc remelting under protective atmosphere. Results indicate that increasing oxygen content in Ti-56Al-10Nb-xO alloys remarkably increases the amount of α 2 phase, and shifts the peritectic reaction α + L → γ to a higher Al content. In Ti-54Al-8Nb-xO alloys, the mixed dendritic microstructure forms. The fine dendrites show peritectic halos and coarse dendrites consist of lamellae. The mixed dendritic microstructure has been interpreted by the stabilizing effect of oxygen on α phase and lamellar structure in high Nb containing TiAl alloys.",

keywords = "Microstructure, Phase transformation, Solidification, Titanium aluminides",

author = "Hong Zhong and Yanlong Yang and Jinshan Li and Jun Wang and Tiebang Zhang and Sheng Li and Ji Zhang",

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T1 - Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys

AU - Zhong, Hong

AU - Yang, Yanlong

AU - Li, Jinshan

AU - Wang, Jun

AU - Zhang, Tiebang

AU - Li, Sheng

AU - Zhang, Ji

PY - 2012/9/15

Y1 - 2012/9/15

N2 - The influence of oxygen on solidification microstructure of high Nb containing TiAl alloys with peritectic liquid composition was experimentally investigated. Alloys with oxygen content from 0.1 to 1.0 at.% were prepared by non-consumable vacuum arc remelting under protective atmosphere. Results indicate that increasing oxygen content in Ti-56Al-10Nb-xO alloys remarkably increases the amount of α 2 phase, and shifts the peritectic reaction α + L → γ to a higher Al content. In Ti-54Al-8Nb-xO alloys, the mixed dendritic microstructure forms. The fine dendrites show peritectic halos and coarse dendrites consist of lamellae. The mixed dendritic microstructure has been interpreted by the stabilizing effect of oxygen on α phase and lamellar structure in high Nb containing TiAl alloys.

AB - The influence of oxygen on solidification microstructure of high Nb containing TiAl alloys with peritectic liquid composition was experimentally investigated. Alloys with oxygen content from 0.1 to 1.0 at.% were prepared by non-consumable vacuum arc remelting under protective atmosphere. Results indicate that increasing oxygen content in Ti-56Al-10Nb-xO alloys remarkably increases the amount of α 2 phase, and shifts the peritectic reaction α + L → γ to a higher Al content. In Ti-54Al-8Nb-xO alloys, the mixed dendritic microstructure forms. The fine dendrites show peritectic halos and coarse dendrites consist of lamellae. The mixed dendritic microstructure has been interpreted by the stabilizing effect of oxygen on α phase and lamellar structure in high Nb containing TiAl alloys.

KW - Microstructure

KW - Phase transformation

KW - Solidification

KW - Titanium aluminides

UR - http://www.scopus.com/inward/record.url?scp=84864150392&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2012.06.013

DO - 10.1016/j.matlet.2012.06.013

M3 - 文章

AN - SCOPUS:84864150392

SN - 0167-577X

VL - 83

SP - 198

EP - 201

JO - Materials Letters

JF - Materials Letters

ER -

Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys

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Keywords

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