Title

On the Creep of Directionally Solidified MoSi₂-Mo₅Si₃ Eutectics

Abstract

The high temperature deformation behaviour of MoSi2-Mo5Si3 eutectics has been investigated as a function of lamellar spacing over the temperature range 1100-1400°C and strain rates (∈) of 1 × 10-4 to 1 × 10-6 s-1. Specimens with lamellar morphologies were produced by directional solidification using the Czochralski method at pull rates of 25-210 mm/h giving lamellar spacings (λ) of 2.6 to 1.09 μm. The measured flow stress was found to increase as the lamellar spacing decreased for a given strain rate. A constitutive model for creep that incorporates reinforcement spacing for creeping fibers in a creeping matrix was found to describe the creep behaviour of the eutectic, i.e. ∈αλ withm = 1. Creep deformation of the eutectic was controlled by 1/2〈110〉 (001) partial dislocations in the Mo5Si3 phase. The creep behaviour of a [314] oriented Mo5Si3 single crystal was also investigated. © 1995 Elsevier Science Ltd.

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1995 Elsevier, All rights reserved.


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