Characterization of C11b/C40 lamellae in a MoSi2-15mol%TaSi2 alloy

被引：11

作者：

Wei, FG ^{[1
]}

Kimura, Y ^{[1
]}

Mishima, Y ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Mat Sci & Engn, Midori Ku, Yokohama, Kanagawa 2268502, Japan

来源：

INTERMETALLICS | 2001年 / 9卷 / 08期

关键词：

molybdenum silicides; phase transformations; phase interfaces; defects; dislocation geometry and arrangement;

D O I：

10.1016/S0966-9795(01)00044-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crystallography of the lamellar structure composed of the tetragonal C11(b) phase and the hexagonal C40 phase which is similar to the well-known TiAl/Ti3Al lamellae was investigated by means of transmission electron microscopy in a MoSi2-15mol%TaSi2 pseudo-binary alloy after homogenized at 1400 degreesC for 168 h. It was found that the orientation relationship between C11(b) and C40 phases obeys the coincidence of the equivalent hexagonal atomic planes for the two phases. Three distinct variants of this orientation relationship were identified by electron diffraction. 1/3 < 2 (1) over bar(1) over bar0] Dislocations prevail in the C11(b)/C40 interfaces to accommodate the lattice misfit between the two phases. On the other hand, networks of < 100] and < 110] dislocations dominate the C11(b)/C11(b) boundaries. < 100] and < 110] dislocations are also present within C11(b) variant plates while 1/3 < 2 (1) over bar(1) over bar0] and 1/3 < 2 (1) over bar(1) over bar3] dislocations are frequently observed in C40 phase. Significance of the 1/3 < 2 (1) over bar(1) over bar3] c-component dislocations for improvement of the plasticity of C40 phase has been discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：661 / 670

页数：10

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