Characteristic orientation relationships in nanoscale $Al-Al_2Cu$ $Eutectic$

Wang, S. J.; Liu, G.; Wang, J.; Misra, A.

doi:10.1016/j.matchar.2018.05.037

Title: Characteristic orientation relationships in nanoscale $$Al-Al_2Cu$$ $Eutectic$

Journal Article · Thu May 24 00:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2018.05.037· OSTI ID:1538560

Wang, S. J. ^[1]; Liu, G. ^[2]; Wang, J. ^[2]; Misra, A. ^[1]

University of Michigan, Ann Arbor, MI (United States)
University of Nebraska, Lincoln, NE (United States)

We report a fully lamellar Al-Al₂Cu eutectic comprising alternate nano-scale α-Al and θ-Al2Cu phases was synthesized through laser surface remelting of a cast Al-32.7 wt% Cu alloy. The orientation relationship between α-Al and θ-Al₂Cu phases was investigated from Kikuchi patterns obtained using electron backscattered diffraction (EBSD) and t-EBSD techniques. The characteristic orientation relationship (OR), {211}_Al2Cu||{111}_Al and $$\langle$$120$$\rangle$$_Al2Cu||$$\langle$$110$$\rangle$$_Al, was observed independent of interlamellar spacing. This OR has two variants where, besides the two parallel planes, the variant I exhibits (001)_Al2Cu||{001}_Al and the variant II exhibits (001)_Al2Cu||{111}_Al. Variant I prevails over variant II in laser-processed α-Al and θ-Al₂Cu nano-laminates, and atomistic modeling indicates that this is due to the low energy interfaces associated with variant I, i.e., {211}_Al2Cu||{111}_Al or (001)_Al2Cu||{001}_Al. A comprehensive understanding of the crystallographic orientation relationships between two phases may help predict or explain the active slip systems in fine-scale Al-Al₂Cu eutectic and other cubic-tetragonal two-phase materials.

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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:: 1538560

Alternate ID(s):: OSTI ID: 1495498

Journal Information:: Materials Characterization, Vol. 142, Issue C; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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