Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1184995
- Alternate Identifier(s):
- OSTI ID: 1251507; OSTI ID: 1321753
- Report Number(s):
- SAND-2014-20275J; LA-UR-14-29177
Journal ID: ISSN 1359-6454; 547558
- Grant/Contract Number:
- AC04-94AL85000; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 95; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Ni-based superalloy; ion irradiation; order-disorder transition; dissolution; mechanical properties
Citation Formats
Sun, C., Kirk, M., Li, M., Hattar, Khalid Mikhiel, Wang, Y., Anderoglu, O., Valdez, J., Uberuaga, B. P., Dickerson, R., and Maloy, S. A. Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature. United States: N. p., 2015.
Web. doi:10.1016/j.actamat.2015.04.061.
Sun, C., Kirk, M., Li, M., Hattar, Khalid Mikhiel, Wang, Y., Anderoglu, O., Valdez, J., Uberuaga, B. P., Dickerson, R., & Maloy, S. A. Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature. United States. https://doi.org/10.1016/j.actamat.2015.04.061
Sun, C., Kirk, M., Li, M., Hattar, Khalid Mikhiel, Wang, Y., Anderoglu, O., Valdez, J., Uberuaga, B. P., Dickerson, R., and Maloy, S. A. Sun .
"Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature". United States. https://doi.org/10.1016/j.actamat.2015.04.061. https://www.osti.gov/servlets/purl/1184995.
@article{osti_1184995,
title = {Microstructure chemistry and mechanical properties of Ni-based superalloy Rene N4 under irradiation at room temperature},
author = {Sun, C. and Kirk, M. and Li, M. and Hattar, Khalid Mikhiel and Wang, Y. and Anderoglu, O. and Valdez, J. and Uberuaga, B. P. and Dickerson, R. and Maloy, S. A.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2015.04.061},
journal = {Acta Materialia},
number = ,
volume = 95,
place = {United States},
year = {Sun Jun 14 00:00:00 EDT 2015},
month = {Sun Jun 14 00:00:00 EDT 2015}
}
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