EFFECT OF WITHDRAWAL RATE ON THE MICROSTRUCTURE OF DIRECTIONAL SOLIDIFIED Ti-47Al-2Cr-2Nb-0.8B ALLOYS

doi:10.3724/SP.J.1037.2010.00081

Acta Metall Sin

2010, Vol. 46

Issue (7): 879-884 DOI: 10.3724/SP.J.1037.2010.00081

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EFFECT OF WITHDRAWAL RATE ON THE MICROSTRUCTURE OF DIRECTIONAL SOLIDIFIED Ti-47Al-2Cr-2Nb-0.8B ALLOYS

YANG Lili, ZHENG Lijing, XIAO Zhixia, YAN Jie, ZHANG Hu

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191

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YANG Lili ZHENG Lijing XIAO Zhixia YAN Jie ZHANG Hu. EFFECT OF WITHDRAWAL RATE ON THE MICROSTRUCTURE OF DIRECTIONAL SOLIDIFIED Ti-47Al-2Cr-2Nb-0.8B ALLOYS. Acta Metall Sin, 2010, 46(7): 879-884.

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Abstract

The microstructures, morphology of boride and grain refinement in directional solidified Ti-47Al-2Cr-2Nb-0.8B alloy with different withdrawal rates have been investigated. The results indicated that the primary phase, borides and their precipitation consequence varied with the increasing of withdrawal rates (0.36, 5, 10 and 20 mm/min). The morphologies of borides and grain refinement were affected by the solidification paths due to the different withdrawal rates. The alloy with fine grains and borides were obtained at the withdrawal rate of 5 mm/min.

Key words: TiAl based alloy solidification microstructure grain refinement boride solidification rate

Received: 08 February 2010

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00081 OR https://www.ams.org.cn/EN/Y2010/V46/I7/879

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