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Ultra-strong nanotwinned Al-Ni solid solution alloy with significant plasticity

Abstract

Twin boundaries have been proven effective to strengthen metallic materials while maintaining plasticity. Al, however, has low twinning propensity due to its high stacking fault energy. Here we show, by using a small amount of Ni solutes, high-density twin boundaries and stacking faults form in sputtered Al-Ni solid solution alloys. First-principle density function theory calculations show that Ni solute facilitates the formation of stacking faults and stabilizes nanotwins in Al-Ni solid solutions. In-situ micropillar compression studies reveal high flow stress (exceeding 1.7 GPa), comparable to high strength martensitic steels and Ni alloys. Furthermore, significant plasticity was observed in these nanotwinned Al-Ni alloy films due to the existence of high density twin boundaries and 9R phase.

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Publication details

The article was received on 26 Jun 2018, accepted on 21 Oct 2018 and first published on 22 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR05139A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ultra-strong nanotwinned Al-Ni solid solution alloy with significant plasticity

    Y. Zhang, Q. Li, S. xue, J. Ding, D. Xie, J. Li, T. Niu, H. Wang, H. Wang, J. Wang and X. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05139A

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