Tailoring the Microstructure of a β-Solidifying TiAl Alloy by Controlled Post-solidification Isothermal Holding and Cooling
作者： Jieren Yang , Xuyang Wang , Bei Cao , Yulun Wu , Keren Zhang
DOI: 10.1007/S11661-017-4209-4
关键词: Lamellar structure 、 Phase (matter) 、 Structural material 、 Isothermal process 、 Equiaxed crystals 、 Bar (unit) 、 Microstructure 、 Alloy 、 Metallurgy 、 Materials science
摘要: In this study, the microstructure of a β-solidifying TiAl alloy was modified by means temperature-controlled cooling. The microstructural evolution Ti-44.5Al-4Nb-2Cr-0.1B in different cooling processes investigated. results showed firstly that both solidification-segregation (S-segregation) and β-segregation were reduced considerably raising temperature or extending time single β-phase region. Then samples cooled through β + α phase region at rates 2, 50, 650 K/min. B2-phase some large γ-phases exist lamellar microstructure, which might be more evident higher rate. Further, Burgers relationships {0001} α2//{110} β(B2) {11 $$ \bar{2} $$ 0} α2//{111} identified fast non-Burgers equiaxed α-grains grew easily slow
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Ruirun Chen, Shulin Dong, Jingjie Guo, Hongsheng Ding, Yanqing Su, Hengzhi Fu, Microstructure evolution and mechanical properties of directionally-solidified TiAlNb alloy in different temperature gradients Journal of Alloys and Compounds. ,vol. 648, pp. 667- 675 ,(2015) , 10.1016/J.JALLCOM.2015.06.279
Guohuai Liu, Zhaodong Wang, Tianliang Fu, Yong Li, Haitao Liu, Tianrui Li, Meina Gong, Guodong Wang, Study on the microstructure, phase transition and hardness for the TiAl–Nb alloy design during directional solidification Journal of Alloys and Compounds. ,vol. 650, pp. 45- 52 ,(2015) , 10.1016/J.JALLCOM.2015.07.259
R.M. Imayev, V.M. Imayev, M. Oehring, F. Appel, Alloy design concepts for refined gamma titanium aluminide based alloys Intermetallics. ,vol. 15, pp. 451- 460 ,(2007) , 10.1016/J.INTERMET.2006.05.003
Xian-fei DING, Jun-pin LIN, Lai-qi ZHANG, Guo-liang CHEN, Effects of heat treatment on microstructure of directionally solidified Ti-45Al-8Nb-(W, B, Y) alloy Transactions of Nonferrous Metals Society of China. ,vol. 21, pp. 26- 31 ,(2011) , 10.1016/S1003-6326(11)60673-0
P.A. McQuay, D.M. Dimiduk, S.L. Semiatin, The decomposition of alpha phase during continuous cooling and isothermal transformation in gamma titanium aluminide Scripta Metallurgica Et Materialia. ,vol. 25, pp. 1689- 1694 ,(1991) , 10.1016/0956-716X(91)90476-H
Julio Aguilar, Andre Schievenbusch, Oliver Kättlitz, Investment casting technology for production of TiAl low pressure turbine blades – Process engineering and parameter analysis Intermetallics. ,vol. 19, pp. 757- 761 ,(2011) , 10.1016/J.INTERMET.2010.11.014
T.T. Cheng, M.H. Loretto, The decomposition of the beta phase in Ti–44Al–8Nb and Ti–44Al–4Nb–4Zr–0.2Si alloys Acta Materialia. ,vol. 46, pp. 4801- 4819 ,(1998) , 10.1016/S1359-6454(98)00113-X
Y. Mishin, Chr. Herzig, Diffusion in the Ti–Al system Acta Materialia. ,vol. 48, pp. 589- 623 ,(2000) , 10.1016/S1359-6454(99)00400-0
Z.C. Liu, J.P. Lin, S.J. Li, G.L. Chen, Effects of Nb and Al on the microstructures and mechanical properties of high Nb containing TiAl base alloys Intermetallics. ,vol. 10, pp. 653- 659 ,(2002) , 10.1016/S0966-9795(02)00037-7
D. Hu, H. Jiang, Martensite in a TiAl alloy quenched from beta phase field Intermetallics. ,vol. 56, pp. 87- 95 ,(2015) , 10.1016/J.INTERMET.2014.09.007