On the creep of directionally solidified MoSi{sub 2}-Mo{sub 5}Si{sub 3} eutectics
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
- Univ. of Missouri, Rolla, MO (United States). Dept. of Metallurgical Engineering
The high temperature deformation behavior of MoSi{sub 2}-Mo{sub 5}Si{sub 3} eutectics has been investigated as a function of lamellar spacing over the temperature range 1,100--1,400 C and strain rates ({dot {epsilon}}) of 1 {times} 10{sup {minus}4} to 1 {times} 10{sup {minus}6} s{sup {minus}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 ({lambda}) of 2.6 to 1.09 {mu}m. 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 behavior of the eutectic, i.e. {dot {epsilon}}{alpha}{lambda}{sup m} with m = 1. Creep deformation of the eutectic was controlled by {1/2}<110>(001) partial dislocations in the Mo{sub 5}Si{sub 3} phase. The creep behavior of a [314] oriented Mo{sub 5}Si{sub 3} single crystal was also investigated.
- OSTI ID:
- 31737
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 3 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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