Vacancies as a constitutive element for the design of nanocluster-strengthened ferritic steels

doi:10.1007/s11706-009-0001-8

Front Mater Sci Chin

2009, Vol. 3

Issue (1) : 9-14 https://doi.org/10.1007/s11706-009-0001-8

Research article

Vacancies as a constitutive element for the design of nanocluster-strengthened ferritic steels

MILLER¹(

), FU¹, M. KRCMAR², HOELZER¹, LIU^1,3

1. Materials Science and Technology Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge; 2. Department of Physics, Grand Valley State University, Allendale; 3. Department of Materials Science and Engineering, University of Tennessee, Knoxville

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Abstract

The existence of nanoclusters that are thermodynamically stable at elevated temperatures is truly intriguing because of its scientific implications and potential applications. Highly stable nanoclusters have been observed by atom probe tomography in iron-based alloys at temperatures close to 1400°C (0.92T_m) that appear to defy the stability constraints of artificially created nanostructured materials. The ～4-nm-diameter Ti-, Y- and O-enriched nanoclusters are identified in the new form of a highly defective material state with vacancies as the critical alloying component and with (Ti + Y):O ratio different from the stable TiO₂ and Y₂Ti₂O₇ oxides. Vacancies play an indispensable role in enhancing the oxygen solubility and increasing the oxygen binding energy in the presence of Ti and Y, resulting in the stabilization of coherent nanoclusters. Atom probe tomography characterizations and theoretical predictions indicate that vacancies can be exploited for the first time as a nanoscale constituent to design materials with far superior high temperature properties.

Keywords nanocluster vacancy ferritic alloy nanoscale constituent high temperature property

Corresponding Author(s): MILLER,Email:millermk@ornl.gov

Issue Date: 05 March 2009

Cite this article:

FU,M. KRCMAR,HOELZER, et al. Vacancies as a constitutive element for the design of nanocluster-strengthened ferritic steels[J]. Front Mater Sci Chin, 2009, 3(1): 9-14.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-009-0001-8
https://academic.hep.com.cn/foms/EN/Y2009/V3/I1/9

Fig0 The lift-out and annular milling procedure for the preparation of atom probe needle-shaped specimens from the ball milled powder with the use of a dual beam scanning electron microscope/focused ion beam miller

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