The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy

Mazumder, B.; Parish, C. M.; Bei, H.; Miller, M. K.

doi:10.1016/j.jnucmat.2015.05.057

Title: The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy

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Abstract

Nanostructured ferritic alloys (NFAs) have outstanding high temperature creep properties and extreme tolerance to radiation damage. To achieve these properties, NFAs are fabricated by mechanical alloying of metallic and yttria powders. Atom probe tomography has demonstrated that milling times of at least 40 h are required to produce a uniform distribution of solutes in the flakes. After milling and hot extrusion, the microstructure consists of -Fe, high number densities of Ti-Y-O-vacancy-enriched nanoclusters, and coarse Y2Ti2O7 and Ti(O,C,N) precipitates on the grain boundaries. In contrast, the as-cast condition consists of -Fe with 50-100 m irregularly-shaped Y2Ti2O7 pyrochlore precipitates with smaller embedded precipitates with the Al5Y3O12 (yttrium-aluminum garnet) crystal structure indicating that this traditional processing route is not a viable approach to achieve the desired microstructure. The nano-hardnesses were also substantially different, i.e., 4 and 8 GPa for the as-cast and as-extruded conditions, respectively. These differences can be explained by the differences in the microstructure and the effects of the high vacancy content introduced by mechanical alloying, and the strong binding energy of vacancies with O, Ti, and Y atoms retarding diffusion.

Authors:

Mazumder, B. ^[1]; Parish, C. M. ^[1]; Bei, H. ^[1]; Miller, M. K. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Wed Jun 03 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1185761

Alternate Identifier(s):: OSTI ID: 1251986

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 465; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

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                    Mazumder, B., Parish, C. M., Bei, H., and Miller, M. K. The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy.  United States: N. p., 2015. 
Web.  doi:10.1016/j.jnucmat.2015.05.057.

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                    Mazumder, B., Parish, C. M., Bei, H., & Miller, M. K. The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy.  United States.  https://doi.org/10.1016/j.jnucmat.2015.05.057

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                    Mazumder, B., Parish, C. M., Bei, H., and Miller, M. K. Wed .  
"The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy".  United States.  https://doi.org/10.1016/j.jnucmat.2015.05.057.  https://www.osti.gov/servlets/purl/1185761.

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@article{osti_1185761,

  title        = {The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy},

  author       = {Mazumder, B. and Parish, C. M. and Bei, H. and Miller, M. K.},

  abstractNote = {Nanostructured ferritic alloys (NFAs) have outstanding high temperature creep properties and extreme tolerance to radiation damage. To achieve these properties, NFAs are fabricated by mechanical alloying of metallic and yttria powders. Atom probe tomography has demonstrated that milling times of at least 40 h are required to produce a uniform distribution of solutes in the flakes. After milling and hot extrusion, the microstructure consists of -Fe, high number densities of Ti-Y-O-vacancy-enriched nanoclusters, and coarse Y2Ti2O7 and Ti(O,C,N) precipitates on the grain boundaries. In contrast, the as-cast condition consists of -Fe with 50-100 m irregularly-shaped Y2Ti2O7 pyrochlore precipitates with smaller embedded precipitates with the Al5Y3O12 (yttrium-aluminum garnet) crystal structure indicating that this traditional processing route is not a viable approach to achieve the desired microstructure. The nano-hardnesses were also substantially different, i.e., 4 and 8 GPa for the as-cast and as-extruded conditions, respectively. These differences can be explained by the differences in the microstructure and the effects of the high vacancy content introduced by mechanical alloying, and the strong binding energy of vacancies with O, Ti, and Y atoms retarding diffusion.},

  doi          = {10.1016/j.jnucmat.2015.05.057},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 465,

  place        = {United States},

  year         = {Wed Jun 03 00:00:00 EDT 2015},

  month        = {Wed Jun 03 00:00:00 EDT 2015}

}

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