Deformation behavior of nanoscale Al–Al2Cu eutectics studied by in situ micropillar compression

Wang, S. J.; Xie, D. Y.; Wang, J.; Misra, A.

doi:10.1016/j.msea.2020.140311

Deformation behavior of nanoscale Al–Al₂Cu eutectics studied by in situ micropillar compression

Journal Article · Sat Sep 19 00:00:00 EDT 2020 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2020.140311· OSTI ID:1852352

Wang, S. J. ^[1]; Xie, D. Y. ^[2]; Wang, J. ^[2]; Misra, A. ^[3]

Univ. of Michigan, Ann Arbor, MI (United States); Boise State Univ., ID (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Nebraska, Lincoln, NE (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

We report deformation behavior of nanoscale laser processed Al–Al₂Cu eutectics at room temperature is characterized through in situ micro-pillar compression testing in a scanning transmission microscope. Interlamellar spacing of Al–Al₂Cu eutectics varies from hundreds of nanometers to 20 nm. Three different sizes of micro-pillars are fabricated in order to study the deformation behaviors of single colony and multiple colonies, corresponding to the single crystal and polycrystal respectively. For single colonies, lamellar orientations parallel, normal or inclined to the loading direction were tested. The main findings are: 1) the plasticity mechanisms strongly depend on loading orientation: buckling and kinking in the parallel-loaded eutectics, planar sliding along Al–Al₂Cu lamellar interfaces in the incline-loaded eutectics and localized shearing in the normal-loaded eutectics. 2) the incline-loaded eutectics exhibits the lowest compression flow strength, and the normal-loaded eutectics has the highest compression flow strength. 3) with decreasing inter-lamellar spacing, the strength increases and plasticity is uniformly distributed, as opposed to shear localization. Highest compressive plasticity is observed in polycrystalline eutectics with an ensemble of lamellar orientations with ~20 nm average spacing: 17.9% at flow stress of 1.63 GPa, and degenerate, bimodal morphology: 11.1% at flow stress of 1.36 GPa.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

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

Grant/Contract Number:: SC0016808

OSTI ID:: 1852352

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 800; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Deformation behavior of nanoscale Al–Al2Cu eutectics studied by in situ micropillar compression

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Deformation behavior of nanoscale Al–Al₂Cu eutectics studied by in situ micropillar compression