TY - JOUR
T1 - The temporal evolution of the decomposition of a concentrated multicomponent Fe-Cu-based steel
AU - Prakash Kolli, R.
AU - Seidman, David N.
N1 - Funding Information:
This research is supported by the Office of Naval Research (N00014-03-1-0252), Dr. Julie Christodoulou grant officer. Atom-probe tomographic analyses were performed at the Northwestern University Center for Atom-probe Tomography (NUCAPT), and the LEAP™ tomograph was purchased with funding from the NSF-MRI (DMR-0420532, Dr. Charles Bouldin, monitor) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, monitor) programs. Additionally, the LEAP™ tomograph was enhanced in late April 2006 with a picosecond laser with funding from ONR-DURIP (N0014-06-1-0539, Dr. Julie Christodoulou, monitor). This work made use of Central Facilities supported by the MRSEC Program of the National Science Foundation (DMR-0520513) at the Materials Research Center of Northwestern University. The TEM work was performed in the EPIC facility of NUANCE Center at Northwestern University. NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern University. We extend our gratitude to Professor Emeritus Morris E. Fine, Research Professor Semyon Vaynman, and Research Assistant Professor Dieter Isheim for discussions, and to D.I. for managing NUCAPT.
PY - 2008/5
Y1 - 2008/5
N2 - The nucleation (to a limited extent), growth and coarsening behavior of Cu-rich precipitates in a concentrated multicomponent Fe-Cu-based steel aged at 500 °C from 0.25 to 1024 h is investigated. The temporal evolution of the precipitates, heterophase interfaces, matrix compositions and precipitate morphologies are presented. With increasing time, Cu partitions to the precipitates, Ni, Al and Mn partition to the interfacial region, whereas Fe and Si partition to the matrix. Coarsening time exponents are determined for the mean radius, 〈R(t)〉, number density, NV(t), and supersaturations, which are compared to the Lifshitz-Slyzov-Wagner (LSW) model for coarsening, modified for concentrated multicomponent alloys by Umantsev and Olson (UO). The experimental results indicate that the alloy does not strictly follow UO model behavior. Additionally, we delineate the formation of a Ni-Al-Mn shell with a stoichiometric ratio of 0.51:0.41:0.08 at 1024 h, which reduces the interfacial free energy between the precipitates and the matrix.
AB - The nucleation (to a limited extent), growth and coarsening behavior of Cu-rich precipitates in a concentrated multicomponent Fe-Cu-based steel aged at 500 °C from 0.25 to 1024 h is investigated. The temporal evolution of the precipitates, heterophase interfaces, matrix compositions and precipitate morphologies are presented. With increasing time, Cu partitions to the precipitates, Ni, Al and Mn partition to the interfacial region, whereas Fe and Si partition to the matrix. Coarsening time exponents are determined for the mean radius, 〈R(t)〉, number density, NV(t), and supersaturations, which are compared to the Lifshitz-Slyzov-Wagner (LSW) model for coarsening, modified for concentrated multicomponent alloys by Umantsev and Olson (UO). The experimental results indicate that the alloy does not strictly follow UO model behavior. Additionally, we delineate the formation of a Ni-Al-Mn shell with a stoichiometric ratio of 0.51:0.41:0.08 at 1024 h, which reduces the interfacial free energy between the precipitates and the matrix.
KW - Atom-probe tomography
KW - Coarsening
KW - Fe-Cu alloy
KW - Interfacial segregation
KW - Phase separation
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U2 - 10.1016/j.actamat.2007.12.044
DO - 10.1016/j.actamat.2007.12.044
M3 - Article
AN - SCOPUS:42949146563
VL - 56
SP - 2073
EP - 2088
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 9
ER -