TY - JOUR
T1 - Microstructure and compositional distribution in Arc-melted advanced Nb-silicide-based ultrahigh temperature alloy
AU - He, Yong Sheng
AU - Guo, Xi Ping
AU - Sun, Zhi Ping
AU - Ju, Xiao Chuang
PY - 2009/1
Y1 - 2009/1
N2 - The ingot of Nb-Ti-Si-Cr-Al-Hf-Mo-B-Y ultrahigh temperature alloy was prepared by firstly vacuum non-consumable arc melting and then vacuum consumable arc melting. The microstructures, constituent phases and compositional distribution in the master alloy ingot were analyzed. The results showed that the main constituent phases of the ingot were Nb solid solution (Nbss), (Nb,X)3Si and (Nb,X)5Si3 (where X represents Ti, Hf and Cr elements). The microstructure of the ingot mostly consisted of primary Nbss dendrites, Nbss+(Nb,X)5Si3 eutectic colonies (lamellar or petal-like) and (Nb,X)5Si3 Si blocks. However, the microstructure in the central parts of both the top and bottom of the ingot was composed of Nbss+(Nb,X)5Si3 eutectic colonies, with little primary Nbss dendrites or (Nb,X)3Si blocks. The compositional distribution was not uniform in the master alloy ingot. The Si content increased from the edge part to the central part, and the Ti content decreased from the edge part to the central part of the ingot.
AB - The ingot of Nb-Ti-Si-Cr-Al-Hf-Mo-B-Y ultrahigh temperature alloy was prepared by firstly vacuum non-consumable arc melting and then vacuum consumable arc melting. The microstructures, constituent phases and compositional distribution in the master alloy ingot were analyzed. The results showed that the main constituent phases of the ingot were Nb solid solution (Nbss), (Nb,X)3Si and (Nb,X)5Si3 (where X represents Ti, Hf and Cr elements). The microstructure of the ingot mostly consisted of primary Nbss dendrites, Nbss+(Nb,X)5Si3 eutectic colonies (lamellar or petal-like) and (Nb,X)5Si3 Si blocks. However, the microstructure in the central parts of both the top and bottom of the ingot was composed of Nbss+(Nb,X)5Si3 eutectic colonies, with little primary Nbss dendrites or (Nb,X)3Si blocks. The compositional distribution was not uniform in the master alloy ingot. The Si content increased from the edge part to the central part, and the Ti content decreased from the edge part to the central part of the ingot.
KW - Arc melting
KW - Constituent phase
KW - Microstructure
KW - Nb-silicide-based ultrahigh temperature alloy
UR - http://www.scopus.com/inward/record.url?scp=59949100012&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:59949100012
SN - 1001-4381
SP - 4
EP - 9
JO - Cailiao Gongcheng/Journal of Materials Engineering
JF - Cailiao Gongcheng/Journal of Materials Engineering
IS - 1
ER -