Macro- and micro-mechanical behaviour of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si33.svg"><mml:mrow><mml:msup><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> strengthened Ni-based superalloy at cryogenic temperatures

In-situ neutron diffraction was performed during tensile deformation of a Ni-based superalloy, Haynes 282, at 20, 100 and 300 K. Two distinct uni-modal microstructures with fine (20 nm) coarse (200 γ′ particles were investigated. On the macro-scale yield strength increased ductility decreased decreasing temperature, although most significant decrease in occurred between 20 The work hardening differed two microstructures, but independent temperature for each microstructure. micro-scale intergranular elastic interactions mainly lead to transfer load grains 200 orientation parallel axis. No further re-distribution matrix microstructure γ′, where shearing precipitates co-deformation all temperatures. In microstructure, transferred intragranularly from particles, addition transfer. initially behaved elastically while deformed plastically, higher stresses change partitioning indicated that also phase underwent plastic as result stress build-up partitioning. tendency for, effect of, temperature.