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Strengthening mechanisms and deformability of nanotwinned AlMg alloys

Published online by Cambridge University Press:  09 November 2018

Sichuang Xue*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Qiang Li
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Zhe Fan
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
Han Wang
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Yifan Zhang*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Jie Ding
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Haiyan Wang
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA; and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Xinghang Zhang*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

AlMg alloys have widespread industrial applications. Grain refinement techniques have been frequently used to achieve high strength in these alloys. Here, we report on the fabrication of epitaxial co-sputtered AlMg thin films with high-density growth twins. The microstructure evolution with varying Mg composition has been characterized. Nanoindentation and in-situ micropillar compression tests show that the strength of AlMg alloys increases with increasing Mg composition. The flow stress of epitaxial nanotwinned Al–10 at.% Mg thin film exceeds 800 MPa. The modified Hall–Petch plots incorporating the solid solution strengthening effect suggest that, compared to high angle grain boundaries, incoherent twin boundaries are equivalent barriers to the transmission of dislocations in nanotwinned AlMg alloys.

Type
Invited Paper
Copyright
Copyright © Materials Research Society 2018 

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