Brittle Fracture of Electrodeposited Gold Observed by Micro-Compression

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  • Yoshiba Masaharu
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Chen Chun-Yi
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Chang Tso-Fu Mark
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Nagoshi Takashi
    National Institute of Advanced Industrial Science and Technology
  • Yamane Daisuke
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Machida Katsuyuki
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology NTT Advanced Technology Corporation
  • Masu Kazuya
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Sone Masato
    CREST, Japan Science and Technology Agency Precision & Intelligence Laboratory, Tokyo Institute of Technology

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  • Effects of Pressure in Cathodic Deposition of TiO2 and SnO2 with Supercritical CO2 Emulsified Electrolyte

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Abstract

<p>Micro-compression tests were conducted to evaluate micro-mechanical properties of electrodeposited gold. The gold film was electrodeposited on a platinum substrate with a thickness of 40 μm. The gold film was found to be composed of columnar textures along the film growth direction. Two sizes (10 × 10 × 20 μm3 and 20 × 20 × 40 μm3) of micro-pillars with a square cross-section and the long-side parallel to the Pt/Au interface were fabricated by focused ion beam. From the micro-compression tests, brittle fracture was observed. Both of the micro-pillars showed a high compressive strength of about 600 MPa, which are much higher than the strength of the bulk gold. Grain size of the gold film was estimated to be 14.7 nm, which is believed to be the main factor giving the high compressive strength. The strength of the larger micro-pillar was slightly lower than that of the smaller micro-pillar. The results confirmed presence of the size effect in these specimens.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 57 (8), 1257-1260, 2016

    The Japan Institute of Metals and Materials

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