TY - JOUR
T1 - Effects of compositions and melting processes on the microstructure of multicomponent Nb-based super-high temperature alloys
AU - Guo, Haisheng
AU - Guo, Xiping
AU - Jia, Lina
AU - Wu, Xingjun
AU - Ding, Xu
AU - Gao, Limei
AU - Ren, Jiasong
PY - 2008/7
Y1 - 2008/7
N2 - Four batches of multicomponent Nb-based super-high temperature alloys with different compositions have been prepared by vacuum consumable arc-melting or vacuum non-consumable arc-melting. The effects of compositions and melting processes on the microstructure of multicomponent Nb-based super-high temperature alloys are studied. The results show that the four batches of alloys with different compositions are composed of the primary Nbss (Nb-based solid solution) dendrites, or the primary (Nb, x)5Si3 blocks and plates (x represents Ti, Hf and Cr elements) and the Nbss/(Nb, x)5Si3 eutectic clusters. With the increase of Si content, the amount of Nbss/(Nb, x)5Si3 eutectic clusters increases, and furthermore, the primary phase changes from the Nbss dendrites to the (Nb, x)5Si3 blocks and plates. The Nb silicides are in the forms of γ-(Nb, x)5Si3 and β-(Nb, x)5Si3. Some micro-cracks are observed in big Nb silicide blocks and plates for the four batches of alloy ingots.
AB - Four batches of multicomponent Nb-based super-high temperature alloys with different compositions have been prepared by vacuum consumable arc-melting or vacuum non-consumable arc-melting. The effects of compositions and melting processes on the microstructure of multicomponent Nb-based super-high temperature alloys are studied. The results show that the four batches of alloys with different compositions are composed of the primary Nbss (Nb-based solid solution) dendrites, or the primary (Nb, x)5Si3 blocks and plates (x represents Ti, Hf and Cr elements) and the Nbss/(Nb, x)5Si3 eutectic clusters. With the increase of Si content, the amount of Nbss/(Nb, x)5Si3 eutectic clusters increases, and furthermore, the primary phase changes from the Nbss dendrites to the (Nb, x)5Si3 blocks and plates. The Nb silicides are in the forms of γ-(Nb, x)5Si3 and β-(Nb, x)5Si3. Some micro-cracks are observed in big Nb silicide blocks and plates for the four batches of alloy ingots.
KW - γ-NbSi
KW - Arc-melting
KW - Microstructure
KW - Multicomponent Nb-based super-high temperature alloy
UR - http://www.scopus.com/inward/record.url?scp=49649121285&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:49649121285
SN - 1002-185X
VL - 37
SP - 1299
EP - 1303
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 7
ER -