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

Journal Article · Wed Sep 07 00:00:00 EDT 2022 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2022.118347· OSTI ID:1885953

^[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)

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.

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

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

Grant/Contract Number:: EE0009114

OSTI ID:: 1885953

Alternate ID(s):: OSTI ID: 1892461

Journal Information:: Acta Materialia, Vol. 240; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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