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.
Recommended Citation
D. P. Mason and D. C. Van Aken, "On the Creep of Directionally Solidified MoSi₂-Mo₅Si₃ Eutectics," Acta Metallurgica Et Materialia, Elsevier, Jan 1995.
The definitive version is available at https://doi.org/10.1016/0956-7151(94)00319-D
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.
Publication Date
01 Jan 1995
