Phase Evolution in and Creep Properties of Nb-Rich Nb-Si-Cr Eutectics
Phase Evolution in and Creep Properties of Nb-Rich Nb-Si-Cr Eutectics
复制标题
富铌Nb-Si-Cr共晶的相演化和蠕变性能
DOI:
10.1007/s11661-017-4367-4
复制
发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Heilmaier
中科院分区:
文献类型:
--
作者:
Kauffmann;Heilmaier
In this work, the Nb-rich ternary eutectic in the Nb-Si-Cr system has been experimentally determined to be Nb-10.9Si-28.4Cr (in at. pct). The eutectic is composed of three main phases: Nb solid solution (Nbss), β-Cr2Nb, and Nb9(Si,Cr)5. The ternary eutectic microstructure remains stable for several hundred hours at a temperature up to 1473 K (1200 °C). At 1573 K (1300 °C) and above, the silicide phase Nb9(Si,Cr)5decomposes into α-Nb5Si3, Nbss, and β-Cr2Nb. Under creep conditions at 1473 K (1200 °C), the alloy deforms by dislocation creep while the major creep resistance is provided by the silicide matrix. If the silicide phase is fragmented and, thus, its matrix character is destroyed by prior heat treatment [e.g.,at 1773 K (1500 °C) for 100 hours], creep is mainly controlled by the Laves phase β-Cr2Nb, resulting in increased minimum strain rates. Compared to state of the art Ni-based superalloys, the creep resistance of this three-phase eutectic alloy is significantly higher.
登录
查看更多内容
影响因子:
3.3
作者:
B. Khazai;R. Kershaw;K. Dwight;A. Wold
通讯作者:
A. Wold
影响因子:
2.6
作者:
Heilmaier
通讯作者:
Heilmaier
DOI:
10.1557/proc-646-n2.7.1
发表时间:
2000
期刊:
MRS Proceedings
影响因子:
--
作者:
B. Bewlay;C. Briant;A. W. Davis;M. R. Jackson
通讯作者:
M. R. Jackson
DOI:
10.1016/s0921-5093(02)00011-4
发表时间:
2002-11-25
影响因子:
6.4
作者:
Chan, KS
通讯作者:
Chan, KS