Microstructure evolution of directionally solidified Ti-45Al-8.5Nb-(W, B, Y) alloys
Microstructure evolution of directionally solidified Ti-45Al-8.5Nb-(W, B, Y) alloys
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定向凝固Ti-45Al-8.5Nb-(W,B,Y)合金的显微组织演变
DOI：
10.1016/j.jallcom.2011.01.014
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发表时间：
2011-03-03
影响因子：
6.2
通讯作者：
Chen, G. L.
中科院分区：
文献类型：
--
作者：
Ding, X. F.;Lin, J. P.;Chen, G. L.
Intermetallic Ti-45Al-8.5Nb-(W, B, Y) alloys were directionally solidified at constant growth rates (V) ranging from 10 to 400 mu m/s under the temperature gradient G = 3.8 x 10(3) K/m. Quenching was performed at the end of directional solidification (DS) experiments. Microstructure evolution was investigated by analyzing the microstructures formed at the quenching interfaces and in the DS regions. The primary dendritic arm spacing (lambda) decreases with increasing growth rate according to the relationship lambda proportional to V-0.36. Both the width of columnar grain (lambda(w)) and the interlamellar spacing (lambda(s)) decrease with increasing growth rate according to the relationships lambda(w) proportional to V-1.13 and lambda(s) proportional to V-0.32, respectively. Lamellar microstructure initially disappears from the dendrites at the growth rate of 100 mu m/s and subsequently from the interdendritic regions when the growth rate is up to 200 mu m/s. The B2 particles can precipitate in the interdendritic regions. (C) 2011 Elsevier B.V. All rights reserved.
