Affiliation:
1. Northwestern Polytechnical University
2. Toyama University
Abstract
The directionally solidified specimens of Nb-13.52 Si-22.60 Ti–6.88 Hf–2.54 Cr–2.24 Al alloy were prepared in an electron beam floating zone melting furnace at the withdrawing rate of 0.1, 0.3, 0.6, 1.0, 2.4 and 6.0 mm/min. All the primary Nb solid solution (Nbss) columns, Nbss + (Nb)3Si/(Nb)5Si3 eutectic colonies and divorced (Nb)3Si/(Nb)5Si3 plates or chains align well along the longitudinal axis of the specimens. With increasing of the withdrawing rate, the microstructure is gradually refined, and the amount of Nbss + (Nb)3Si/(Nb)5Si3 eutectic colonies increases. Both the room temperature ultimate tensile strength σb and fracture toughness KQ are improved for the directionally solidified specimens. The tensile fracture occurs in a cleavage way.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference5 articles.
1. B.P. Bewlay, M.R. Jackson, J. -C. Zhao and P.R. Subramanian: Metall. Mater. Trans. Vol. 34A (2003), p. (2043).
2. B.P. Bewlay, M.R. Jackson, J. -C. Zhao, P.R. Subramanian, M.G. Mendiratta and J.J. Lewandowski: MRS Bulletin Vol. 28 (2003), p.646.
3. D. Van Heerden, A.J. Gavens, P.R. Subramanian, T. Foecke and T.P. Weihs: Metall. Mater. Trans. Vol. 32A (2001), p.2363.
4. B.P. Bewlay, M.R. Jackson and H.A. Lipsitt: Metall. Mater. Trans. Vol. 27A (1996), p.3801.
5. P. Guan, X.P. Guo, X. Ding, J. Zhang, L.M. Gao and K. Kusabiraki: Acta Metallurgica Sinica (English Letters) Vol. 17 (2004), No. 4, in press.
Cited by
18 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献