Mechanical twinning in Ni-based single crystal superalloys during multiaxial creep at 1050 °C
Materials Science and Engineering: A(2018)
摘要
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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关键词
Nickel base single crystal superalloy,Mechanical twinning,Deformation mechanism,Creep,High temperature
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