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Mechanical twinning in Ni-based single crystal superalloys during multiaxial creep at 1050 °C

Jean-Briac Le Graverend 1 Florence Pettinari-Sturmel 2 Jonathan Cormier 1 Muriel Hantcherli 2 Patrick Villechaise 1 Joël Douin 2
1 ENDO - ENDOmmagement et durabilité ENDO
Département Physique et Mécanique des Matériaux - Département Physique et Mécanique des Matériaux
2 CEMES-PPM - Physique de la Plasticité et Métallurgie
CEMES - Centre d'élaboration de matériaux et d'études structurales
Abstract : Multiaxial high-temperature creep tests have been performed at 1050 °C on a first-generation Ni-based single-crystal superalloy through the use of asymmetric notched specimens. Mechanical twins have been observed by EBSD and TEM analyses. A finite element simulation in a crystal plasticity framework has also been carried out to better understand the presence of mechanical twins at stress concentrators depending on stress triaxiality, plastic strain rate, and damage level.
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https://hal.archives-ouvertes.fr/hal-02062064
Contributor : Joël Douin Connect in order to contact the contributor
Submitted on : Friday, March 8, 2019 - 3:14:19 PM
Last modification on : Monday, April 4, 2022 - 3:24:40 PM

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Jean-Briac Le Graverend, Florence Pettinari-Sturmel, Jonathan Cormier, Muriel Hantcherli, Patrick Villechaise, et al.. Mechanical twinning in Ni-based single crystal superalloys during multiaxial creep at 1050 °C. Materials Science and Engineering: A, Elsevier, 2018, 722, pp.76-87. ⟨10.1016/j.msea.2018.02.086⟩. ⟨hal-02062064⟩

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