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Analysis of Steady-state Creep and Creep Fracture of Directionally Solidified Eutectic Gamma/gamma'-alpha Alloy

Onglets principaux

Lapin, J. Delannay, Francis [UCL]

The steady-state creep behavior of directionally solidified eutectic alloy Ni-30Mo-6Al-1.6V-1.2Re (wt pet) was investigated at temperatures between 1223 and 1323 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 +/- 0.3, and the apparent activation energy for creep of the eutectic gamma/gamma'-alpha composite is determined to be Q = 517 +/- 11 kJ mol(-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(c) is calculated to be between 412 and 424 kJ mol(-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.

Type de document Article de périodique (Journal article) – Article de recherche
Type d'accès Accès restreint
Année de publication 1995
Langue Anglais
Information sur le périodique "Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science" - Vol. 26, no. 8, p. 2053-2062 (1995)
Peer reviewed oui
Editeur Minerals Metals Materials Soc (Warrendale)
issn 1073-5623
e-issn 1543-1940
Statut de la publication Publié
Affiliations UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Liens
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Référence bibliographique Lapin, J. ; Delannay, Francis. Analysis of Steady-state Creep and Creep Fracture of Directionally Solidified Eutectic Gamma/gamma'-alpha Alloy. In: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Vol. 26, no. 8, p. 2053-2062 (1995)
Permalien http://hdl.handle.net/2078.1/47913