|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Exploring Thermo-mechanical Deformation Mechanism of a NiAl-Cr(Mo) Superalloy by In-situ Neutron Diffraction
||Dunji Yu, Ke An, Xu Chen, Hongbin Bei
|On-Site Speaker (Planned)
The phase-specific thermal expansion and mechanical deformation of a directionally solidified NiAl-Cr(Mo) nano-layered superalloy are investigated by using in situ neutron diffraction during compression at elevated temperatures up to 800 <SUP>o</SUP>C. The tensile and compressive thermal residual stresses are found in NiAl phase and Cr solid solution (Cr<SUB>ss</SUB>), respectively, due to the mismatch of the coefficients of thermal expansion. At loading, the NiAl phase yields earlier than the Cr<SUB>ss</SUB> phase. The Cr<SUB>ss</SUB> phase carries much higher stress than the NiAl phase, and it displays consistent strain hardening at the full temperature range. The NiAl phase exhibits strain hardening at relatively low temperatures but softening at high temperatures. At unloading, the NiAl phase yields in tensile stress state whereas the Cr<SUB>ss</SUB> phase is elastically recovered. Therefore, the Cr<SUB>ss</SUB> nano-layers are mainly accounted for the high strength of the superalloy.
||Planned: Supplemental Proceedings volume