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Equal channel angular pressing with rotating shear plane to produce hybrid materials with helical architecture of constituents

Published online by Cambridge University Press:  11 September 2017

Rimma Lapovok ,
Andrey Molotnikov ,
Alexander Medvedev  and
Yuri Estrin
Rimma Lapovok*
Affiliation:
Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia
Andrey Molotnikov
Affiliation:
Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
Alexander Medvedev
Affiliation:
Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia
Yuri Estrin
Affiliation:
Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia; and Laboratory of Hybrid Nanostructured Materials, National University of Science and Technology “MISIS”, Moscow 119049, Russia
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A modification of the metal processing technique known as equal channel angular pressing (ECAP) to incorporate shear plane rotation, called ECAP-R, is presented. The new process was developed to produce hybrid materials with helical architecture of their constituents, which holds promise to enable enhanced mechanical properties. The process was trialled experimentally using a specially designed laboratory-scale rig. It was shown that a positive mean stress (negative hydrostatic pressure) in a part of the multipiece billet leads to separation of the constituents within that region. A way to improving the process design was suggested based on finite element simulations. It was demonstrated that the proposed processing results in excellent bonding between the helical parts of the hybrid in the regions of positive hydrostatic pressure. Subsequent annealing gave rise to further improvement of the quality of bonding. Processing by ECAP-R at elevated temperatures was suggested as a viable method of producing hybrid materials with helical architecture.

Keywords

hybrid materialsequal channel angular pressingshear plane rotationhelical architecture
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 24: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART B , 28 December 2017 , pp. 4483 - 4490
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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