EFFECT OF WITHDRAWAL RATE ON THE MICROSTRUCTURE OF DIRECTIONAL SOLIDIFIED Ti-47Al-2Cr-2Nb-0.8B ALLOYS
Received date: 2010-02-08
Revised date: 2010-04-30
Online published: 2010-07-11
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.
YANG Li-Li , ZHANG Hu , XIAO Zhi-Xia , ZHENG Li-Jing , YAN Ji . EFFECT OF WITHDRAWAL RATE ON THE MICROSTRUCTURE OF DIRECTIONAL SOLIDIFIED Ti-47Al-2Cr-2Nb-0.8B ALLOYS[J]. Acta Metall Sin, 2010 , 46(7) : 879 -884 . DOI: 10.3724/SP.J.1037.2010.00081
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