Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys

Lei, Tianjiao; Hessong, Esther C.; Shin, Jungho; Gianola, Daniel S.; Rupert, Timothy J.

doi:10.1016/j.actamat.2022.118347

Title: Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys

Abstract

The mechanical behavior of two nanocrystalline Al alloys, Al-Mg-Y and Al-Fe-Y, is investigated with in-situ micropillar compression testing. Both alloys were strengthened by a hierarchical microstructure including grain boundary segregation, nanometer-thick amorphous complexions, carbide nanorod precipitates with sizes of a few nanometers, and submicron-scale intermetallic particles. The maximum yield strength of the Al-Mg-Y system is measured to be 950 MPa, exceeding that of the Al-Fe-Y system (680 MPa), primarily due to a combination of more carbide nanorods and more amorphous complexions. Both alloys exhibited yield strengths much higher than those of commercial Al alloys, and therefore have great potential for structural applications. However, some micropillar specimens were observed to plastically soften through shear banding. Post-mortem investigation revealed that intermetallic-free deformation pathways of a few micrometers in length were responsible for this failure. Further characterization showed significant grain growth within the shear band. The coarsened grains maintained the same orientation with each other, pointing to grain boundary mechanisms for plastic flow, specifically grain rotation and/or grain boundary migration. Here, the presence of intermetallic particles makes it difficult for both matrix and intermetallic grains to rotate into the same orientation due to the different lattice parameters and slip systems. Therefore, we aremore »« less

Authors:

^[1];

^[1]; Shin, Jungho ^[2];

^[3]; Rupert, Timothy J. ^[1]

Univ. of California, Irvine, CA (United States)
Univ. of California, Santa Barbara, CA (United States); Gangneung-Wonju National Univ., Gangwon-do (Korea, Republic of)
Univ. of California, Santa Barbara, CA (United States)

Publication Date:: Wed Sep 07 00:00:00 EDT 2022

Research Org.:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

OSTI Identifier:: 1885953

Alternate Identifier(s):: OSTI ID: 1892461

Grant/Contract Number:: EE0009114

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 240; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; nanocrystalline Al alloys; shear localization; intermetallic particles; strengthening mechanisms

Citation Formats


                    Lei, Tianjiao, Hessong, Esther C., Shin, Jungho, Gianola, Daniel S., and Rupert, Timothy J. Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys.  United States: N. p., 2022. 
Web.  doi:10.1016/j.actamat.2022.118347.

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                    Lei, Tianjiao, Hessong, Esther C., Shin, Jungho, Gianola, Daniel S., & Rupert, Timothy J. Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys.  United States.  https://doi.org/10.1016/j.actamat.2022.118347

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                    Lei, Tianjiao, Hessong, Esther C., Shin, Jungho, Gianola, Daniel S., and Rupert, Timothy J. Wed .  
"Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys".  United States.  https://doi.org/10.1016/j.actamat.2022.118347.  https://www.osti.gov/servlets/purl/1885953.

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@article{osti_1885953,

  title        = {Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys},

  author       = {Lei, Tianjiao and Hessong, Esther C. and Shin, Jungho and Gianola, Daniel S. and Rupert, Timothy J.},

  abstractNote = {The mechanical behavior of two nanocrystalline Al alloys, Al-Mg-Y and Al-Fe-Y, is investigated with in-situ micropillar compression testing. Both alloys were strengthened by a hierarchical microstructure including grain boundary segregation, nanometer-thick amorphous complexions, carbide nanorod precipitates with sizes of a few nanometers, and submicron-scale intermetallic particles. The maximum yield strength of the Al-Mg-Y system is measured to be 950 MPa, exceeding that of the Al-Fe-Y system (680 MPa), primarily due to a combination of more carbide nanorods and more amorphous complexions. Both alloys exhibited yield strengths much higher than those of commercial Al alloys, and therefore have great potential for structural applications. However, some micropillar specimens were observed to plastically soften through shear banding. Post-mortem investigation revealed that intermetallic-free deformation pathways of a few micrometers in length were responsible for this failure. Further characterization showed significant grain growth within the shear band. The coarsened grains maintained the same orientation with each other, pointing to grain boundary mechanisms for plastic flow, specifically grain rotation and/or grain boundary migration. Here, the presence of intermetallic particles makes it difficult for both matrix and intermetallic grains to rotate into the same orientation due to the different lattice parameters and slip systems. Therefore, we are able to conclude that a uniform distribution of intermetallic particles with an average spacing less than the percolation length of shear localization can effectively prevent the maturation of shear bands, offering a design strategy for high-strength nanocrystalline Al alloys with both high strength and stable plastic flow.},

  doi          = {10.1016/j.actamat.2022.118347},

  journal      = {Acta Materialia},

  number       = ,

  volume       = 240,

  place        = {United States},

  year         = {Wed Sep 07 00:00:00 EDT 2022},

  month        = {Wed Sep 07 00:00:00 EDT 2022}

}

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Title: Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys

Abstract

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Grain Boundary Complexion Transitions
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Focused Ion Beam (FIB): A novel technology for advanced application of micro- and nanoanalysis in geosciences and applied mineralogy [Focused Ion Beam (FIB): A novel technology for advanced application of micro- and nanoanalysis in geosciences and applied mineralogy]
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Design of Stable Nanocrystalline Alloys
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Inter- and intragranular plasticity mechanisms in ultrafine-grained Al thin films: An in situ TEM study
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Electrical Resistivity and Thermal Conductivity of Pure Aluminum and Aluminum Alloys up to and above the Melting Temperature
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Precipitation strengthening of the aluminum alloy AA6111
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Evaluation of Micro-Pillar Compression Tests for Accurate Determination of Elastic-Plastic Constitutive Relations
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Structural Changes During the Aging in An Al-Mg-Zn Alloy
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Strengthening mechanisms of an Al-Mg-Sc-Zr alloy
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Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys
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Phase stability, electronic, elastic and thermodynamic properties of Al-RE intermetallics in Mg-Al-RE alloy: A first principles study
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Materials selection rules for amorphous complexion formation in binary metallic alloys
journal, November 2017

Influence of repulsive energy on structural parameters of close-packed metal structures
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Anisotropy of intermetallic particle cracking damage evolution in an Al-Mg-Si base wrought aluminum alloy under uniaxial compression
journal, November 2002

A methodology to investigate size scale effects in crystalline plasticity using uniaxial compression testing
journal, July 2005

Novel Ti-base nanostructure–dendrite composite with enhanced plasticity
journal, December 2002

On the origin of the extremely high strength of ultrafine-grained Al alloys produced by severe plastic deformation
journal, November 2010

Grain boundary migration during room temperature deformation of nanocrystalline Ni
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Mechanical behavior and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy
journal, January 2014

Coarse Graining and Localized Plasticity between Sliding Nanocrystalline Metals
journal, July 2014

The Deformation and Ageing of Mild Steel: III Discussion of Results
journal, September 1951

Effects of nanocrystalline and ultrafine grain sizes on constitutive behavior and shear bands in iron
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Suppression of shear localization in nanocrystalline Al–Ni–Ce via segregation engineering
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Limits of hardness at the nanoscale: Molecular dynamics simulations
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On the Hall–Petch relationship in a nanostructured Al–Cu alloy
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Grain-boundary sliding in nanocrystalline fcc metals
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Mechanical properties of nanocrystalline materials
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Designing metallic glass matrix composites with high toughness and tensile ductility
journal, February 2008

Strain localization in a nanocrystalline metal: Atomic mechanisms and the effect of testing conditions
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Sample Dimensions Influence Strength and Crystal Plasticity
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Y–Fe–Al ternary system: partial isothermal section at 1070 K
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Grain boundary complexions and the strength of nanocrystalline metals: Dislocation emission and propagation
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Mechanical behavior of crystalline solids at elevated temperature
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