HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION OF A HIGH-Nb-CONTAINING TiAl BASED ALLOY

doi:10.3724/SP.J.1037.2011.00005

Acta Metall Sin

2011, Vol. 47

Issue (5): 587-593 DOI: 10.3724/SP.J.1037.2011.00005

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HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION OF A HIGH-Nb-CONTAINING TiAl BASED ALLOY

WANG Gang, XU Lei, WANG Yong, ZHENG Zhuo, CUI Yuyou, YANG Rui

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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WANG Gang XU Lei WANG Yong ZHENG Zhuo CUI Yuyou YANG Rui. HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION OF A HIGH-Nb-CONTAINING TiAl BASED ALLOY. Acta Metall Sin, 2011, 47(5): 587-593.

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Abstract The hot deformation behavior of a high-Nb-containing TiAl based alloy has been studied using the processing map approach. Compression tests were conducted in the temperature range of 950-1300 ℃ and the strain rate range of 0.001 s^-1 to 10 s^-1 on a Gleeble-3800 testing system. The flow stress was found to be strongly dependent on the temperature and the strain rate. The regimes of flow instability have been delineated in the temperature range of 950-1200 ℃ and the strain rate ranges from 1 s^-1 to 10 s^-1, as well as in the temperature of 1250-1300 ℃ and the strain rate of 10 s^-1. The optimal hot-working conditions for the investigated TiAl alloy are in two regimes: (i) in the temperature range 950-1100 ℃ and at the strain rate of 0.001 s^-1 to 0.1 s^-1, and (ii) in the temperature range 1250-1300 ℃ and at the strain rate of 0.001 s^-1 to 1 s^-1. The material exhibited dynamic recrystallization to produce a fine-grained microstructure in these conditions. In the temperature range 1150-1200 ℃ with the strain rate 0.001 s^-1, the alloy exhibited superplasticity.

Key words: TiAl alloy processing map hot deformation dynamic recrystallization superplasticity

Received: 04 January 2011

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