Citeable URL: http://ir.library.oregonstate.edu/concern/articles/nz806128b

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work and it is therefore in the public domain in the United States. This is the publisher’s final pdf. The published article can be found at:  http://iopscience.iop.org/journal/0957-4484

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Attribute Name	Values
Creator	Garfinkel, David A Haley, Daniel Guo, Wei Poplawsky, Jonathan D Tucker, Julie D Young, George A
Abstract or Summary	Three-dimensional chemical imaging of Fe–Cr alloys showing Fe-rich (α)/Cr-rich (α') phase separation is reported using atom probe tomography techniques. The extent of phase separation, i.e., amplitude and wavelength, has been quantitatively assessed using the Langer-Bar-on-Miller, proximity histogram, and autocorrelation function methods for two separate Fe–Cr alloys, designated 2101 and 2205. Although the 2101 alloy possesses a larger wavelength and amplitude after annealing at 427 °C for 100–10 000 h, it exhibits a lower hardness than the 2205 alloy. In addition to this phase separation, ultra-fine Ni–Mn–Si–Cu-rich G-phase precipitates form at the α/α' interfaces in both alloys. For the 2101 alloy, Cu clusters act to form a nucleus, around which a Ni–Mn–Si shell develops during the precipitation process. For the 2205 alloy, the Ni and Cu atoms enrich simultaneously and no core–shell chemical distribution was found. This segregation phenomenon may arise from the exact Ni/Cu ratio inside the ferrite. After annealing for 10 000 h, the number density of the G-phase within the 2205 alloy was found to be roughly one order of magnitude higher than in the 2101 alloy. The G-phase precipitates have an additional deleterious effect on the thermal embrittlement, as evaluated by the Ashby–Orowan equation, which explains the discrepancy between the hardness and the rate of phase separation with respect to annealing time (Gladman T 1999 Mater. Sci. Tech. Ser. 15 30–36).
Resource Type	Article
DOI	10.1088/0957-4484/27/25/254004
Date Available	2016-06-28T13:32:05+00:00
Date Issued	2016-06-24
Citation	Guo, W., Garfinkel, D. A., Tucker, J. D., Haley, D., Young, G. A., & Poplawsky, J. D. (2016). An atom probe perspective on phase separation and precipitation in duplex stainless steels. Nanotechnology, 27(25), 254004. doi:10.1088/0957-4484/27/25/254004
Series	Vol. 27 no. 25 Nanotechnology
Keyword	thermal embrittlement atom probe tomography Fe-Cr alloy Cu cluster phase separation G-phase
Rights Statement	Copyright Not Evaluated
Funding Statement (additional comments about funding)	The authors thank Dr Hongbin Bei at Oak Ridge National Laboratory, Rosalia Rementeria at CENIM, and Ty Prosa at CAMECA Madison for fruitful discussions. This research was supported by ORNL's Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy.
Publisher	IOP Publishing
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/59366
Additional Information	description.provenance : Submitted by Open Access (openaccess@library.oregonstate.edu) on 2016-06-27T17:17:35Z No. of bitstreams: 1 GuoAtomPRobePerspective.pdf: 3611695 bytes, checksum: 70bcae826f2965e835206104b15029e7 (MD5) description.provenance : Made available in DSpace on 2016-06-28T13:32:05Z (GMT). No. of bitstreams: 2 krauserp707423277.zip: 3012673 bytes, checksum: b46d1fa3150620bd3bdca3b37c67e7e3 (MD5) GuoAtomPRobePerspective.pdf: 3611695 bytes, checksum: 70bcae826f2965e835206104b15029e7 (MD5) Previous issue date: 2016-06-24 description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-06-28T13:32:05Z (GMT) No. of bitstreams: 2 krauserp707423277.zip: 3012673 bytes, checksum: b46d1fa3150620bd3bdca3b37c67e7e3 (MD5) GuoAtomPRobePerspective.pdf: 3611695 bytes, checksum: 70bcae826f2965e835206104b15029e7 (MD5)

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