Effects of boron on the microstructure and thermal stability of directionally solidified NiAl-Mo eutectic

被引：10
|
作者：
Gali, A. [1 ,2 ]
Bei, H. [1 ]
George, E. P. [1 ,2 ]
机构：
[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
来源：
ACTA MATERIALIA | 2010年 / 58卷 / 02期
关键词：
Interfaces; Segregation; Directional solidification; Coarsening; Composites; ELEVATED-TEMPERATURES; FRACTURE-RESISTANCE; COMPOSITES; GROWTH; ALLOY; INTERFACE; STRENGTH; BEHAVIOR; MELT;
D O I：
10.1016/j.actamat.2009.09.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microalloying with 0.01 at.% B decreases the range of growth speeds over which a well-aligned fibrous eutectic microstructure can be obtained in directionally solidified NiAl-Mo. Compared to the undoped alloy, the size/spacing of the Mo fibers is larger, and the fiber density smaller, in the B-doped alloy. Annealing at 1400 degrees C coarsens the fibers by a mechanism involving fault migration and annihilation driven by diffusion along the fiber-matrix interface. The coarsening kinetics, given by the decrease in Mo fiber density with time, is exponential, and microalloying with B decreases the coarsening rate. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：421 / 428
页数：8
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