Speaker
Description
Nickel base single crystal superalloys with higher volume fraction of γˊ are known to be severely susceptible to hydrogen embrittlement. Hydrogen is found to increase the slip planarity, accumulate dislocations in γ channels causing a macroscopic fracture along {001} γ/γˊ interface [1]. There is long standing enigma on the exact reason behind this γ/γˊ interfacial failure. Few theoretical studies predict the segregation of H to γ/γˊ interface as the cause for this [2,3]. However, there is no evident experimental proof to show preferential segregation of H to any of the microstructural features. Our focus is to understand preferential segregation of H using APT with D as tracer element and correlating it with other experimental results to get better insights into the γ/γˊ interfacial failure.
