Yonguk Lee publishes paper describing multiply coherent gamma grains in a Ni-base superalloy

Schematic diagram illustrating the proposed mechanism of MCG formation. During ingot-to-billet processing, primary γ′ are coarsened but their local orientation is biased. Following sub-solvus hot deformation initiates HeRX nucleation from one γ′ particle. Finally, the growth of the HeRX grain forms MCGs.
Schematic diagram illustrating the proposed mechanism of MCG formation. During ingot-to-billet processing, primary γ′ are coarsened but their local orientation is biased. Following sub-solvus hot deformation initiates HeRX nucleation from one γ′ particle. Finally, the growth of the HeRX grain forms MCGs.

August 21, 2024 in Featured, News, Papers

Yonguk Lee recently published “On the Formation of Multiply Coherent γ Grains in a Powder Metallurgy Ni Base Superalloy” in the Superalloys 2024 proceedings. The paper reports a unique γ microstructure which contains multiple pinning particles inside that are coherent (multiply coherent gamma grains, MCGs), which are explained to have possibly formed through the combined effect of initial orientation bias of the γ’ particles and the onset of HeRX.

Read the paper here: https://doi.org/10.1007/978-3-031-63937-1_73