Compressive creep behavior of Mo5Si3 with the addition of boron

被引：136

作者：

Meyer, MK ^{[1
]}

Kramer, MJ ^{[1
]}

Akinca, M ^{[1
]}

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011

来源：

INTERMETALLICS | 1996年 / 4卷 / 04期

关键词：

molybdenum silicides; ternary alloying; phase transformations; mechanical properties at high temperatures;

D O I：

10.1016/0966-9795(95)00048-8

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：

Mo5S3 shows high creep resistance but poor high temperature oxidation resistance. Previous work has shown that the oxidation rate of Mo5Si3 can be decreased with the addition of boron. By adding 1 3 wt % boron to a silicon deficient composition, a three phase microstructure composed of Mo5Si3 (T1), Mo5Si3, and a ternary Mo-5(Si,B)3 (T2) phase was synthesized. The compressive creep rate of this composition was evaluated at 1240-1320 degrees C and 120-180 MPa. The average creep stress exponent and activation energy for the three phase material were found to be n = 4.3 and E(a) = 396 kJ/mol. TEM analysis of the crept microstructure of the boron modified material reveals no evidence for dislocation activity in T1. Only basal slip was observed in the T2 phase while polygonal sub-grain structures were observed in Mo3Si. (C) 1996 Elsevier Science Ltd.

引用

页码：273 / 281

页数：9

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