Solidification process and mechanical behavior of the Nb/Nb5Si3 two phase alloys in the Nb-Ti-Si system

被引：32
|
作者：
Sekido, N
Kimura, Y
Miura, S
Mishima, Y
机构：
[1] Tokyo Inst Technol, Dept Mat Sci & Engn, Yokohama, Kanagawa 2268502, Japan
[2] Hokkaido Univ, Div Mat Sci & Engn, Sapporo, Hokkaido 0600813, Japan
来源：
MATERIALS TRANSACTIONS | 2004年 / 45卷 / 12期
关键词：
phase equilibria; solidification; eutectoid reaction; fracture toughness;
D O I：
10.2320/matertrans.45.3264
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Design of two-phase alloys consisting of niobium solid solution (A2) and alpha-Nb5Si3 (D8(1)) phases in the Nb-Ti-Si tertiary system is pursued for ultra-high temperature structural applications. Compositional and annealing conditions are determined for the formation of A2/D8(1) lamellar microstructure via cutectoid decomposition of Nb3Si (tP32) phase in the Nb-Si binary and Nb-Ti-Si tertiary system. Addition of titanium is found to result in increased room temperature toughness, but decreased high temperature strength. Enhancement of mechanical properties is achieved by applying the directional solidification technique. Mechanical properties of the alloys are discussed from microstructural point of view.
引用
收藏
页码：3264 / 3271
页数：8
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