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

• 藤田 和孝

  宇部工業高等専門学校機械工学科

• 橋本 哲郎

  宇部工業高等専門学校専攻科生産システム工学専攻

• 張 偉

  東北大学金属材料研究所

• 西山 信行

  財団法人次世代金属・複合材料研究開発協会東北大学研究室

• 馬 朝利

  北京航空航天大学材料科学与工程学院

• 木村 久道

  東北大学金属材料研究所

• 井上 明久

  東北大学金属材料研究所

書誌事項

タイトル別名

• Fatigue Strength in Nanocrystalline Ti- and Cu-Based Bulk Metallic Glasses
• Tiキ オヨビ Cuキ ナノ ケッショウ ブンサンガタ バルク キンゾク ガラス ノ ヒロウ キョウド

抄録

  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_41.5Zr_2.5Hf₅Cu_42.5Ni_7.5Si₁ at% and Cu₆₀Zr₃₀Ti₁₀ at% systems by copper mold casting. Nanocrystals were dispersed in the metallic glassy phase in both BMGs. The tensile strength (σ_B) 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_w) (half a total stress amplitude) and fatigue ratio (σ_w/σ_B) 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_w≈500 MPa).<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 70 (10), 816-823, 2006

  公益社団法人 日本金属学会

キーワード

• fatigue
• fatigue limit
• bulk metallic glass
• bulk glassy alloy
• amorphous
• nanocrystal

詳細情報

• CRID: 1390001206480534784
• NII論文ID: 10018310722
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.70.816
• COI: 1:CAS:528:DC%2BD28Xht1Ogsb7N
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 8550668
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8550668
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/70/10/70_10_816/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可