TY - JOUR
T1 - Unidirectional solidification of a Nbss/Nb5Si 3 in-situ composite
AU - Guo, X. P.
AU - Guan, P.
AU - Ding, X.
AU - Zhang, J.
AU - Kusabiraki, K.
AU - Fu, H. Z.
PY - 2005
Y1 - 2005
N2 - 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 Nb ss + (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.
AB - 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 Nb ss + (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.
KW - Eutectic in-situ composites
KW - Mechanical properties
KW - Microstructural evolution
KW - Niobium suicide
KW - Ultrahigh temperature alloy
KW - Unidirectional solidification
UR - http://www.scopus.com/inward/record.url?scp=17044362644&partnerID=8YFLogxK
U2 - 10.4028/0-87849-960-1.745
DO - 10.4028/0-87849-960-1.745
M3 - 会议文章
AN - SCOPUS:17044362644
SN - 0255-5476
VL - 475-479
SP - 745
EP - 748
JO - Materials Science Forum
JF - Materials Science Forum
IS - I
T2 - PRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing
Y2 - 2 November 2004 through 5 November 2004
ER -
