Počet záznamů: 1  

High-temperature and low-stress creep anisotropy of single-crystal superalloys

  1. 1.
    0398847 - UFM-A 2014 RIV GB eng J - Článek v odborném periodiku
    Jacome, L. A. - Nortershauser, P. - Heyer, J. K. - Lahni, A. - Frenzel, J. - Dlouhý, Antonín - Somsen, C. - Eggeler, G.
    High-temperature and low-stress creep anisotropy of single-crystal superalloys.
    Acta Materialia. Roč. 61, č. 8 (2013), s. 2926-2943. ISSN 1359-6454
    Grant CEP: GA ČR(CZ) GA202/09/2073
    Institucionální podpora: RVO:68081723
    Klíčová slova: superalloy single crystals * creep anisotropy * rafting * dislocations * deformation mechanisms
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.940, rok: 2013

    The high-temperature and low-stress creep (1293 K, 160 MPa) of the single-crystal Ni-based superalloy LEK 94 is investigated, comparing the tensile creep behavior of miniature creep specimens in [0 0 1] and [1 1 0] directions. In the early stages of creep, the [0 0 1]-direction loading shows higher minimum creep rates, because a greater number of microscopic crystallographic slip systems are activated, the dislocation networks at gamma/gamma' interfaces accommodate lattice misfit better, and gamma channels are wider. After the creep rate minimum, creep rates increase more strongly as a function of strain for [1 1 0] tensile loading. This may be related to the nature of rafting during [1 1 0] tensile creep, which results in a more open topology of the gamma channels. It may also be related to more frequent gamma' cutting events compared with [1 0 0] tensile creep.
    Trvalý link: http://hdl.handle.net/11104/0226233