Ti基およびCu基ナノ結晶分散型バルク金属ガラスの疲労強度 Fatigue Strength in Nanocrystalline Ti- and Cu-Based Bulk Metallic Glasses

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  Fatigue tests were carried out on nanocrystalline Ti- and Cu-based bulk metallic glasses (BMGs) for which there are still no reports on fatigue strength. Test alloy rods with a diameter of 2 mm were prepared in nanocrystalline Ti<sub>41.5</sub>Zr<sub>2.5</sub>Hf<sub>5</sub>Cu<sub>42.5</sub>Ni<sub>7.5</sub>Si<sub>1</sub> at% and Cu<sub>60</sub>Zr<sub>30</sub>Ti<sub>10</sub> at% systems by copper mold casting. Nanocrystals were dispersed in the metallic glassy phase in both BMGs. The tensile strength (σ<sub>B</sub>) in the nanocrystalline Ti- and Cu-based BMGs were 2.04 GPa and 2.00 GPa, and Young' s modulus were 95 GPa and 114 GPa, respectively. The test specimens were machined to hourglass shape type (the radius in axial direction; 4.45 mm, the minimum diameter; 0.9 mm), and after machining the specimen surfaces were electropolished by 50~100 μm. The specimens were tested at a stress ratio of 0.1 and a frequency of 5-8 Hz. The fatigue limit (σ<sub>w</sub>) (half a total stress amplitude) and fatigue ratio (σ<sub>w</sub>/σ<sub>B</sub>) in the nanocrystalline Ti- and Cu-based BMGs showed very large values (Ti-based alloy; 806 MPa and 0.40, Cu-based alloy; 490 MPa and 0.25). This experimental result indicated a possibility that the nanocrystal dispersed BMGs have higher fatigue strength than the high strength crystalline alloys with high fatigue strength (e.g. Cr-Mo steel, σ<sub>w</sub>≈500 MPa).<br>

収録刊行物

  • 日本金屬學會誌 = Journal of the Japan Institute of Metals

    日本金屬學會誌 = Journal of the Japan Institute of Metals 70(10), 816-823, 2006-10-20

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10018310722
  • NII書誌ID(NCID)
    AN00062446
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214876
  • NDL 記事登録ID
    8550668
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-314
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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