Variation of the strength of grains and grain boundaries caused by the fluctuation of their crystallinity

Takahiro Nakanishi, Ken Suzuki, Hideo Miura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The variation of the strength of a grain and a grain boundary was measured by a micro tensile test system fabricated in an electron microscope. A micro-scale beam structure was fabricated from a single-crystalline silicon wafer and a fine nano-scale sample cut from a thin film using a focused ion beam was attached to the center of the beam by deposition of tungsten in the microscope. The other end was attached to a micro probe similarly. Finally, the micro probe was activated to pull the sample and the deformation of the sample was observed by a scanning electron microscope. The fracture strength of a bicrystal sample was measured by detecting the deflection of the beam at the breakage of the sample. The crystallinity of both a grain and a grain boundary was quantitatively evaluated by using electron back-scatter diffraction analysis from the viewpoint of the change of the order of atom arrangement in them. It was found that the strength of a grain and a grain boundary varied clearly depending on their crystallinity. In addition, there was a critical value of the crystallinity at which the fracture mode of a polycrystalline material changed from intergranular fracture to transgranular fracture.

Original languageEnglish
Title of host publicationMechanics of Solids, Structures and Fluids; NDE, Diagnosis, and Prognosis
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume9
ISBN (Electronic)9780791850633
DOIs
Publication statusPublished - 2016
EventASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016 - Phoenix, United States
Duration: 2016 Nov 112016 Nov 17

Other

OtherASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016
CountryUnited States
CityPhoenix
Period16/11/1116/11/17

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Nakanishi, T., Suzuki, K., & Miura, H. (2016). Variation of the strength of grains and grain boundaries caused by the fluctuation of their crystallinity. In Mechanics of Solids, Structures and Fluids; NDE, Diagnosis, and Prognosis (Vol. 9). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE201667557