Formation, Thermal Stability and Mechanical Properties of Bulk Glassy Alloys with a Diameter of 20 mm in Zr-(Ti,Nb)-Al-Ni-Cu System

• Inoue A.

  WPI. Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

• Zhang Q. S.

  WPI. Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

• Zhang W.

  Institute for Materials Research, Tohoku University

• Yubuta K.

  Institute for Materials Research, Tohoku University

• Son K. S.

  Institute for Materials Research, Tohoku University

• Wang X. M.

  Institute for Materials Research, Tohoku University

抄録

Bulk glassy alloy rods with a diameter of 20 mm were produced for Zr₆₁Ti₂Nb₂Al_7.5Ni₁₀Cu_17.5 and Zr₆₀Ti₂Nb₂Al_7.5Ni₁₀Cu_18.5 by a tilt casting method. The replacement of Zr by a small amount of Ti and Nb caused a distinct increase in the maximum diameter from 16 mm for Zr₆₅Al_7.5Ni₁₀Cu_17.5 to 20 mm, accompanying the decrease in liquidus temperature and the increase in reduced glass transition temperature. The primary precipitation phase from supercooled liquid also shows a distinct change, i.e., from coexistent Zr₂Cu, Zr₂Ni and Zr₆NiAl₂ phases for the 65%Zr alloy to an icosahedral phase for the 61%Zr and 60%Zr alloys. These results allow us to presume that the enhancement of the glass-forming ability is due to an increase in the stability of supercooled liquid against crystallization caused by the development of icosahedral short-range ordered atomic configurations. The 60%Zr specimens taken from the central and near-surface regions in the transverse cross section at the site which is 15 mm away from the bottom surface of the cast glassy rod with a diameter of 20 mm exhibit good mechanical properties under a compressive deformation mode, i.e., Young’s modulus of 81 GPa, large elastic strain of 0.02, high yield strength of 1610 MPa and distinct plastic strain of 0.012. Besides, a number of shear bands are observed along the maximum shear stress plane on the peripheral surface near the final fracture site. The finding of producing the large scale Zr-based bulk glassy alloys exhibiting reliable mechanical properties is encouraging for future advancement of bulk glassy alloys as a new type of functional material.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 50 (2), 388-394, 2009

  公益社団法人 日本金属学会

キーワード

• zirconium-based alloys
• glass-forming ability
• thermal stability
• mechanical property
• crystallization

詳細情報

• CRID: 1390001204250535680
• NII論文ID: 10024812012
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mer2008179
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 9785608
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9785608
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/50/2/50_MER2008179/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
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  • KAKEN
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