Microstructure and mechanical properties of Nb/Nb5Si3 in situ composites in Nb-Mo-Si and Nb-W-Si systems

被引：100
|
作者：
Ma, CL [1 ]
Li, JG
Tan, Y
Tanaka, R
Hanada, S
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China
[2] Japan Ultra High Temp Mat Res Inst, Ube, Yamaguchi 7550001, Japan
[3] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 386卷 / 1-2期
关键词：
silicide; in situ composite; solidification; high-temperature strength;
D O I：
10.1016/j.msea.2004.08.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper presents the microstructure and mechanical properties of Nb/Nb5Si3 in situ composites prepared from Nb-Mo-Si and Nb-W-Si systems by casting and heat-treatment. The solidification behavior and the phase relationships at 1700degreesC of these alloys are described. We observe that a new eutectic of L --> Nb-ss (Nb solid solution) + betaNb(5)Si(3) (W5Si3-type, D8(m)) exists over a wide range of Mo or W content in the Nb-Mo-Si and Nb-W-Si ternary systems, which is absent in the Nb-Ti-Si and Nb-Hf-Si systems. A very fine two-phase structure of Nb and Nb-silicide can be obtained through this eutectic reaction. Mo and W produce strong solid- solution-hardening effect on the Nb phase, and this effect persists to very high temperature. In contrast, the solid-solution-strengthening of Si operates effectively only at relatively low temperatures. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：375 / 383
页数：9
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