TY - JOUR
T1 - Effect of solidifying rate on directionally solidified microstructure of niobium based in-situ composites
AU - Ding, Xu
AU - Zhou, Lian
AU - Guo, Xiping
AU - Zhou, Yigang
AU - Zhang, Tingjie
AU - Li, Zhongkui
PY - 2005/10
Y1 - 2005/10
N2 - An ingot of Nb based in-situ composites (NBISC) was produced by a vacuum self-consuming arc melting furnace. The directionally solidified samples were prepared by an electron beam floating zone melting (EBFZM) furnace with a high temperature gradient, and their microstructural characteristics were analyzed. The results show that the microstructure of as-cast NBISC is composed of primary dendrites of Nb solid solution (Nbss) and the eutectic colonies of Nbssplus (Nb,Ti)3Si/(Nb,Ti)5Si3. In the EBFZM furnace, with the increase of withdrawing rate, the eutectic microstructure of NBISC is refined. The amount of eutectic colonies layers increases. The sizes of (Nb,Ti)3Si/(Nb,Ti)5Si3 lumps or plates decrease and their amount increases. Their morphology tends to more regular, and the distribution becomes more homogeneous. The directionality becomes intensive and the directionally solidified effects are remarkable.
AB - An ingot of Nb based in-situ composites (NBISC) was produced by a vacuum self-consuming arc melting furnace. The directionally solidified samples were prepared by an electron beam floating zone melting (EBFZM) furnace with a high temperature gradient, and their microstructural characteristics were analyzed. The results show that the microstructure of as-cast NBISC is composed of primary dendrites of Nb solid solution (Nbss) and the eutectic colonies of Nbssplus (Nb,Ti)3Si/(Nb,Ti)5Si3. In the EBFZM furnace, with the increase of withdrawing rate, the eutectic microstructure of NBISC is refined. The amount of eutectic colonies layers increases. The sizes of (Nb,Ti)3Si/(Nb,Ti)5Si3 lumps or plates decrease and their amount increases. Their morphology tends to more regular, and the distribution becomes more homogeneous. The directionality becomes intensive and the directionally solidified effects are remarkable.
KW - Directional solidification
KW - Electron beam floating zone melting
KW - Niobium based in-situ composites (NBISC)
KW - Solidifying rate
UR - https://www.scopus.com/pages/publications/27944441016
M3 - 文章
AN - SCOPUS:27944441016
SN - 1002-185X
VL - 34
SP - 1605
EP - 1608
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 10
ER -