Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys

Poplawsky, Jonathan D.; Michi, Richard A.; Allard, Lawrence F.; Bahl, Sumit; Plotkowski, Alex J.; Shyam, Amit

doi:10.1016/j.addlet.2022.100086

Title: Using θ' interfaces as templates for planar L1₂ precipitation in AlCuMnZr alloys

Abstract

Controlled Mn and Zr additions to Al-Cu alloys have allowed for the improved retention of mechanical properties after extended 350°C exposures by stabilizing the main strengthening θ' (Al₂Cu) phase. Ultimately, θ'/L1₂(Al₃Zr) co-precipitate formation stabilizes θ' most effectively; however, Zr diffuses sluggishly and has low solubility in aluminum castings. Increasing the Zr segregation rate would allow for faster and more effective θ'/L1₂ co-precipitation. It is demonstrated that the Zr segregation rate is faster when the Zr matrix content is higher. A much higher Zr matrix content was achieved by rapid cooling during additive manufacturing (AM) that produces θ'/L1₂ co-precipitation faster, which is shown by scanning transmission electron microscopy and atom probe tomography experiments. It was also found that Zr continuously segregates to θ' interfaces up to the most aggressive heat treatment studied such that planar L1₂ precipitates remain after the metastable θ' dissolves. In this manner, we demonstrate that θ' coherent interfaces serve as perfect templates to form stable planar L1₂ precipitates that can provide strength at higher temperatures than traditional θ' strengthened AlCu alloys. This work introduces an alloy design strategy that uses metastable precipitates to quickly nucleate and grow co-precipitates with a desired geometry that contain slow diffusingmore »« less

Authors:

^[1]; Michi, Richard A. ^[1];

^[1]; Bahl, Sumit ^[1];

^[1];

^[1]

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

Publication Date:: Sat Aug 13 00:00:00 EDT 2022

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

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

OSTI Identifier:: 1883854

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Additive Manufacturing Letters

Additional Journal Information:: Journal Volume: 3; Journal Issue: N/A; Journal ID: ISSN 2772-3690

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; aluminum alloy; precipitate stability; elemental diffusion; atom probe tomography; scanning transmission electron microscopy

Citation Formats


                    Poplawsky, Jonathan D., Michi, Richard A., Allard, Lawrence F., Bahl, Sumit, Plotkowski, Alex J., and Shyam, Amit. Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys.  United States: N. p., 2022. 
Web.  doi:10.1016/j.addlet.2022.100086.

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                    Poplawsky, Jonathan D., Michi, Richard A., Allard, Lawrence F., Bahl, Sumit, Plotkowski, Alex J., & Shyam, Amit. Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys.  United States.  https://doi.org/10.1016/j.addlet.2022.100086

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                    Poplawsky, Jonathan D., Michi, Richard A., Allard, Lawrence F., Bahl, Sumit, Plotkowski, Alex J., and Shyam, Amit. Sat .  
"Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys".  United States.  https://doi.org/10.1016/j.addlet.2022.100086.  https://www.osti.gov/servlets/purl/1883854.

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@article{osti_1883854,

  title        = {Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys},

  author       = {Poplawsky, Jonathan D. and Michi, Richard A. and Allard, Lawrence F. and Bahl, Sumit and Plotkowski, Alex J. and Shyam, Amit},

  abstractNote = {Controlled Mn and Zr additions to Al-Cu alloys have allowed for the improved retention of mechanical properties after extended 350°C exposures by stabilizing the main strengthening θ' (Al2Cu) phase. Ultimately, θ'/L12 (Al3Zr) co-precipitate formation stabilizes θ' most effectively; however, Zr diffuses sluggishly and has low solubility in aluminum castings. Increasing the Zr segregation rate would allow for faster and more effective θ'/L12 co-precipitation. It is demonstrated that the Zr segregation rate is faster when the Zr matrix content is higher. A much higher Zr matrix content was achieved by rapid cooling during additive manufacturing (AM) that produces θ'/L12 co-precipitation faster, which is shown by scanning transmission electron microscopy and atom probe tomography experiments. It was also found that Zr continuously segregates to θ' interfaces up to the most aggressive heat treatment studied such that planar L12 precipitates remain after the metastable θ' dissolves. In this manner, we demonstrate that θ' coherent interfaces serve as perfect templates to form stable planar L12 precipitates that can provide strength at higher temperatures than traditional θ' strengthened AlCu alloys. This work introduces an alloy design strategy that uses metastable precipitates to quickly nucleate and grow co-precipitates with a desired geometry that contain slow diffusing elements. These ideas can be applied to engineer more heat resistant alloys by taking advantage of high solute matrix contents enabled by rapid cooling during additive manufacturing.},

  doi          = {10.1016/j.addlet.2022.100086},

  journal      = {Additive Manufacturing Letters},

  number       = N/A,

  volume       = 3,

  place        = {United States},

  year         = {Sat Aug 13 00:00:00 EDT 2022},

  month        = {Sat Aug 13 00:00:00 EDT 2022}

}

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Title: Using θ' interfaces as templates for planar L12 precipitation in AlCuMnZr alloys

Abstract

Citation Formats

Elevated temperature microstructural stability in cast AlCuMnZr alloys through solute segregation journal, September 2019

Complex precipitation pathways in multicomponent alloys journal, May 2006

Impact of microstructural stability on the creep behavior of cast Al–Cu alloys journal, January 2020

Growth behavior of γ ' / γ ' ' coprecipitates in Ni-Base superalloys journal, February 2019

Prediction of the Al-rich part of the Al-Cu phase diagram using cluster expansion and statistical mechanics journal, August 2020

Improvement in compressive creep resistance of Al-0.2Zr alloy with L12 structured Sc-enriched precipitates journal, January 2020

Microstructure and mechanical properties of Al-Mg-Zr alloys processed by selective laser melting journal, July 2018

Co-stabilization of θ′-Al2Cu and Al3Sc precipitates in Sc-microalloyed Al–Cu alloy with enhanced creep resistance journal, June 2019

Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part II—Mechanical and Thermal Properties journal, March 2017

Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part I—Microstructure Evolution journal, March 2017

The role of Si in determining the stability of the θ′ precipitate in Al-Cu-Mn-Zr alloys journal, May 2021

Microstructural evolution and strengthening mechanisms in a heat-treated additively manufactured Al–Cu–Mn–Zr alloy journal, April 2022

Effect of Mo, Zr, and Y on the high-temperature properties of Al–Cu–Mn alloy journal, October 2019

Atomic scale investigation of non-equilibrium segregation of boron in a quenched Mo-free martensitic steel journal, December 2015

Multiscale modeling of θ′ precipitation in Al–Cu binary alloys journal, June 2004

Criteria for developing castable, creep-resistant aluminum-based alloys – A review journal, March 2006

Nucleation and Precipitation Strengthening in Dilute Al-Ti and Al-Zr Alloys journal, September 2007

Absolute atomic-scale measurements of the Gibbsian interfacial excess of solute at internal interfaces journal, September 1993

Mechanisms for stabilizing θ′(Al2Cu) precipitates at elevated temperatures investigated with phase field modeling journal, June 2019

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In situ site-specific specimen preparation for atom probe tomography journal, February 2007

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Title: Using θ' interfaces as templates for planar L1₂ precipitation in AlCuMnZr alloys

Elevated temperature microstructural stability in cast AlCuMnZr alloys through solute segregation
journal, September 2019

Complex precipitation pathways in multicomponent alloys
journal, May 2006

Impact of microstructural stability on the creep behavior of cast Al–Cu alloys
journal, January 2020

Growth behavior of $γ' / γ''$ coprecipitates in Ni-Base superalloys
journal, February 2019

Prediction of the Al-rich part of the Al-Cu phase diagram using cluster expansion and statistical mechanics
journal, August 2020

Improvement in compressive creep resistance of Al-0.2Zr alloy with L12 structured Sc-enriched precipitates
journal, January 2020

Microstructure and mechanical properties of Al-Mg-Zr alloys processed by selective laser melting
journal, July 2018

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journal, March 2017

Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part I—Microstructure Evolution
journal, March 2017

The role of Si in determining the stability of the θ′ precipitate in Al-Cu-Mn-Zr alloys
journal, May 2021

Microstructural evolution and strengthening mechanisms in a heat-treated additively manufactured Al–Cu–Mn–Zr alloy
journal, April 2022

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journal, October 2019

Atomic scale investigation of non-equilibrium segregation of boron in a quenched Mo-free martensitic steel
journal, December 2015

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journal, June 2004

Criteria for developing castable, creep-resistant aluminum-based alloys – A review
journal, March 2006

Nucleation and Precipitation Strengthening in Dilute Al-Ti and Al-Zr Alloys
journal, September 2007

Absolute atomic-scale measurements of the Gibbsian interfacial excess of solute at internal interfaces
journal, September 1993

Mechanisms for stabilizing θ′(Al2Cu) precipitates at elevated temperatures investigated with phase field modeling
journal, June 2019

The Al-Zr (aluminum-zirconium) system
journal, June 1992

Aging behavior and strengthening mechanisms of coarsening resistant metastable θ' precipitates in an Al–Cu alloy
journal, January 2021

First-principles study of the solubility of Zr in Al
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journal, August 2022

In situ site-specific specimen preparation for atom probe tomography
journal, February 2007

Effect of laser rescanning on the grain microstructure of a selective laser melted Al-Mg-Zr alloy
journal, September 2018

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journal, April 2022

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journal, April 2005

Application of cast Al–Si alloys in internal combustion engine components
journal, March 2014

An additively manufactured AlCuMnZr alloy microstructure and tensile mechanical properties
journal, August 2020

Highly monodisperse core–shell particles created by solid-state reactions
journal, August 2011

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journal, March 2021

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journal, July 2021

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journal, August 2020