Journal of Materials Science

, Volume 53, Issue 9, pp 6980–6990 | Cite as

Shear localization and size-dependent strength of YCd6 quasicrystal approximant at the micrometer length scale

  • Gyuho Song
  • Tai Kong
  • Keith J. Dusoe
  • Paul C. Canfield
  • Seok-Woo Lee
Metals
  • 89 Downloads

Abstract

Mechanical properties of materials are strongly dependent of their atomic arrangement as well as the sample dimension, particularly at the micrometer length scale. In this study, we investigated the small-scale mechanical properties of single-crystalline YCd6, which is a rational approximant of the icosahedral Y-Cd quasicrystal. In situ microcompression tests revealed that shear localization always occurs on {101} planes, but the shear direction is not constrained to any particular crystallographic directions. Furthermore, the yield strengths show the size dependence with a power law exponent of 0.4. Shear localization on {101} planes and size-dependent yield strength are explained in terms of a large interplanar spacing between {101} planes and the energetics of shear localization process, respectively. The mechanical behavior of the icosahedral Y-Cd quasicrystal is also compared to understand the influence of translational symmetry on the shear localization process in both YCd6 and Y-Cd quasicrystal micropillars. The results of this study will provide an important insight in a fundamental understanding of shear localization process in novel complex intermetallic compounds.

Notes

Acknowledgements

The authors gratefully acknowledge the financial support of UConn Start-Up Grant. FIB works were performed using the facilities in the UConn/FEI Center for Advanced Microscopy and Materials Analysis (CAMMA). Work by P.C. Canfield and T. Kong was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. Their research was performed at the Ames Laboratory. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials Science and Engineering and Institute of Materials ScienceUniversity of ConnecticutStorrsUSA
  2. 2.Ames Laboratory, U.S. DOE and Department of Physics and AstronomyIowa State UniversityAmesUSA

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