|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Nuclear Energy
||EBSD and TEM Assessment of Deformation Localization in 718 Alloy
||Aida Amroussia, Keith J Leonard, Maxim N Gussev, Jacqueline Stevens
|On-Site Speaker (Planned)
The performance of Ni-base alloy 718 is dependent upon many factors that include the starting microstructure and its subsequent evolution under the combination of applied stresses, irradiation, and corrosive environments. The previous characterization of in-reactor stress corrosion cracking of two different heats of 718 alloy leaf spring (LS) material showed a difference in resistance to the stress corrosion cracking. Microstructural and microhardness changes in the materials were minimal following exposure. The present work examines the effect of the starting microstructure on strain localization and deformation behavior in the two 718-alloy heats with different delta-phase amounts. The materials are characterized using SEM, EBSD, TEM, and EDS. The -phase morphology and its volume fraction is investigated. FIB liftout are prepared to identify and analyze the chemical composition of the precipitates in detail. EBSD in combination with slip trace analysis method is used to asses the delta-phase role on plastic strain localization.
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