Fracture Toughness Testing of Micro-Sized TiAl Based Intermetallic Compound Specimens

• TAKASHIMA Kazuki

  Dept. of Mech. Eng. and Materials Sci., Faculty of Eng., Kumamoto Univ.

• HALFORD Timothy P.

  P & I Laboratory, Tokyo Inst. of Tech.

• RUDINAL Discar

  P & I Laboratory, Tokyo Inst. of Tech.

• HIGO Yakichi

  P & I Laboratory, Tokyo Inst. of Tech.

Bibliographic Information

Other Title

• マイクロサイズ試験片によるＴｉＡｌ基金属間化合物の破壊じん性試験
• マイクロサイズ シケンヘン ニ ヨル TiAl キキンゾク カン カゴウブツ ノ ハカイジンセイ シケン

Abstract

A micro-sized fracture toughness testing technique has been applied to investigate the fracture properties of colonies in a fully lamellar Ti-46Al-5Nb-1W alloy. Micro-sized cantilever specimens with a size≈10×20×50 μm³ were prepared by focused ion beam machining. Notches with a width of 0.5 μm and a depth of 5 μm were also introduced into these specimens by focused ion beam machining. Fracture tests were successfully completed using a mechanical testing machine for micro-sized specimens at room temperature. The fracture toughness values obtained were in the range 1.4-6.9 MPam^1/2. Fracture surface observations indicate that these variations are due to differences in local lamellar orientations ahead of the notch. These fracture toughness values are also lower than those having been previously reported in conventional samples. This may be due to the absence of significant extrinsic toughening mechanisms in these micro-sized specimens. Fracture mechanisms of these alloys are also considered on the micrometer scale. The results obtained in this investigation give important and fundamental information on the development of TiAl based alloys with high fracture toughness.

Journal

• Journal of the Society of Materials Science, Japan

  Journal of the Society of Materials Science, Japan 54 (10), 1036-1040, 2005

  The Society of Materials Science, Japan

Keywords

• TiAl based alloy
• Micro-sized specimens
• Micro mechanical testing
• Fracture toughness
• Size effect

Details

• CRID: 1390001205418840704
• NII Article ID: 110006266404
• NII Book ID: AN00096175
• DOI: 10.2472/jsms.54.1036
• ISSN: 18807488
• ISSN: 05145163
• NDL BIB ID: 7489310
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7489310
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed