4.6 Article

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

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JOURNAL OF MATERIALS SCIENCE
卷 53, 期 9, 页码 6980-6990

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SPRINGER
DOI: 10.1007/s10853-018-2043-8

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  1. UConn Start-Up Grant
  2. U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering
  3. U.S. Department of Energy [DE-AC02-07CH11358]

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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.

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