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Size effect on mechanical properties in high-order hierarchically nanotwinned metals

Published online by Cambridge University Press:  21 January 2019

Jicheng Li  and
Ke-Gang Wang Open the ORCID record for Ke-Gang Wang [Opens in a new window]
Jicheng Li
Affiliation:
Department of Mechanical & Civil Engineering, Florida Institute of Technology, Melbourne, Florida 32901, USA; Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China; and Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang, Sichuan 621999, China
Ke-Gang Wang*
Affiliation:
Department of Mechanical & Civil Engineering, Florida Institute of Technology, Melbourne, Florida 32901, USA
*
a)Address all correspondence to this author. e-mail: kwang@fit.edu
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Abstract

Theoretical models for the strength and ductility of high-order hierarchically nanotwinned metals are developed, and especially analytical expressions of mechanical parameters with various influencing factors are deduced. Furthermore, the size effect on mechanical properties is analyzed based on these mechanism-based plasticity models, wherein the effects of twin spacing and grain size on the strength and ductility are discussed systemically. Related analysis demonstrates that the twin spacing plays an important role. Through adjusting the twin spacing of the primary layer of twin lamellae and optimizing the combination of twin spacing of the high-order layers, expected mechanical properties with high strength and high ductility could be achieved. Besides, the grain size also has a significant effect, and the reduction in grain size still induces a positive effect on the strength, whereas a negative effect on the ductility. Finally, a material design approach for the optimization of comprehensive mechanical properties is suggested.

Keywords

hierarchically nanotwinned metalsize effectstrengthductilitytheoretical analysis
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 13: Focus Issue: Intrinsic and Extrinsic Size Effects in Materials , 15 July 2019 , pp. 2177 - 2193
Copyright
Copyright © Materials Research Society 2019 

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