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Cyclically induced grain growth within shear bands investigated in UFG Ni by cyclic high pressure torsion

Published online by Cambridge University Press:  25 July 2017

Marlene Walpurga Kapp ,
Oliver Renk ,
Thomas Leitner ,
Pradipta Ghosh ,
Bo Yang  and
Reinhard Pippan
Marlene Walpurga Kapp*
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Oliver Renk
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Thomas Leitner
Affiliation:
Department of Materials Physics, Montanuniversität Leoben, Leoben 8700, Austria
Pradipta Ghosh
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Bo Yang
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Reinhard Pippan
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
*
a)Address all correspondence to this author. e-mail: marlene.kapp@stud.unileoben.ac.at
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Abstract

Structural instabilities of nanocrystalline and ultrafine-grained (UFG) materials have been recognized as a major challenge during cyclic loading, especially in the low cycle fatigue regime. Although a severe deterioration of the mechanical properties has been reported during cyclic deformation, quantification of the softening portion solely due to grain coarsening was not possible. It will be demonstrated that cyclic high pressure torsion (CHPT) is a versatile method to enable direct measurement of the impact of grain coarsening on cyclic softening, as failure of the sample is prevented. Here, CHPT experiments have been performed on 99.99% UFG nickel. Grain coarsening similar to conventional uniaxial fatigue experiments was observed and could be studied up to large cyclic accumulated macro strains of 50. The correlation of electron back scatter diffraction images with microhardness measurements facilitated quantification of the cyclic softening as a consequence of grain growth for the very first time. Further, structural investigations revealed distinctly enhanced grain coarsening within shear bands. Thus, the cyclic strain seems to be the most important parameter controlling mechanically driven boundary migration during cyclic loading at low homologous temperatures.

Keywords

nanostructuredfatiguestructural
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 23: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART A , 14 December 2017 , pp. 4317 - 4326
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Yuntian Zhu

References

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