Analysis of steady-state creep and creep fracture of directionally solidified eutectic {gamma}/{gamma}{prime}-{alpha} alloy
Journal Article
·
· Metallurgical Transactions, A
OSTI ID:109785
- Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Materials and Machine Mechanics
- Univ. Catholique de Louvain, Louvain-la-Neuve (Belgium)
The steady-state creep behavior of directionally solidified eutectic alloy Ni-30Mo-6Al-1.6V-1.2Re (wt pct) was investigated at temperatures between 1,223 and 1,323 K using constant strain rate tension creep tests. The steady-state stress is found to depend strongly on creep rate and temperature. The apparent power law stress exponent for steady-state stress is n = 7.5 {plus_minus} 0.3, and the apparent activation energy for creep of the eutectic {gamma}/{gamma}{prime}-{alpha} composite is determined to be Q = 517 {plus_minus} 11 kJ mol{sup {minus}1}. When the steady-state creep is analyzed in terms of the effective stress and normalized with respect to the temperature dependence of the elastic modulus, the corrected activation energy for creep Q{sub c} is calculated to be between 412 and 424 kJ mol{sup {minus}1} and the stress exponent between 5.7 and 6.0. The kinetics of the steady-state creep deformation within the studied temperature range involves the contribution of both the fibers and the matrix which creep during steady-state. Analysis of the fracture surfaces of the composite shows ductile fracture mode. The composite fails by growth and coalescence of microvoids in the matrix and by fiber fragmentation.
- OSTI ID:
- 109785
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 8 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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