Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature

Sun, C.; Kirk, M.; Li, M.; Hattar, Khalid Mikhiel; Wang, Y.; Anderoglu, O.; Valdez, J.; Uberuaga, B. P.; Dickerson, R.; Maloy, S. A.

doi:10.1016/j.actamat.2015.04.061

Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature

Journal Article · Sun Jun 14 00:00:00 EDT 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.04.061· OSTI ID:1184995

Sun, C. ^[1]; Kirk, M. ^[2]; Li, M. ^[2]; Hattar, Khalid Mikhiel ^[3]; Wang, Y. ^[1]; Anderoglu, O. ^[1]; Valdez, J. ^[1]; Uberuaga, B. P. ^[1]; Dickerson, R. ^[1]; Maloy, S. A. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Nickel superalloys with cubic L12 structured γ' (Ni₃(Al, Ti)) precipitates exhibit high strength at high temperatures and excellent corrosion resistance when exposed to water. Unlike prior studies on irradiation damage of other Ni-based superalloys, our study on Rene N4 involves much larger γ' precipitates, ~450 nm in size, a size regime where the irradiation-induced disordering and dissolution kinetics and the corresponding mechanical property evolution are unknown. Under heavy ion irradiation at room temperature, the submicron-sized γ' precipitates were fully disordered at ~0.3 dpa and only later partially dissolved after 75 dpa irradiation. Nanoindentation experiments indicate that the mechanical properties of the alloy change significantly, with a dramatic decrease in hardness, with irradiation dose. Three contributions to the change in hardness were examined: defect clusters, disordering and dissolution. Moreover, the generation of defect clusters in the matrix and precipitates slightly increased the indentation hardness, while disordering of the submicron-sized γ' precipitates resulted in a dramatic decrease in the total hardness, which decreased further during the early stages of the intermixing between γ' precipitates and matrix (<18 dpa). As a result, controlling the long-range-ordering and chemical intermixing can be used to tailor the mechanical properties of Ni-based superalloys under irradiation.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; AC52-06NA25396

OSTI ID:: 1184995

Alternate ID(s):: OSTI ID: 1321753
OSTI ID: 22453045
OSTI ID: 1251507

Report Number(s):: LA-UR-14-29177; SAND--2014-20275J; 547558

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 95; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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