Deformation-Induced Nanoscale Dynamic Transformation Studies in Zr-Al-Ni-Pd and Zr-Al-Ni-Cu Bulk Metallic Glasses

• Saida Junji

  Center for Interdisciplinary Research, Tohoku University

• Kato Hidemi

  Institute for Materials Research, Tohoku University

• Setyawan Albertus Deny Heri

  Graduate student, Tohoku University

• Yoshimi Kyosuke

  Department of Environmental Studies, Tohoku University

• Inoue Akihisa

  Institute for Materials Research, Tohoku University President, Tohoku University

抄録

Nanoscale dynamic transformations during tensile and compressive deformation of Zr₆₅Al_7.5Ni₁₀Cu_17.5 and Zr₆₅Al_7.5Ni₁₀Pd_17.5 bulk metallic glasses have been investigated. Although no apparent differences are observed in the stress-strain curves in the tensile deformation between the two alloys, fine striations and depression zones with viscous flow appear at the fracture surface near the edge in the Zr₆₅Al_7.5Ni₁₀Pd_17.5 alloy. Unlike the Zr₆₅Al_7.5Ni₁₀Cu_17.5 alloy and other bulk metallic glasses, the Zr₆₅Al_7.5Ni₁₀Pd_17.5 bulk metallic glass exhibits a large plastic strain of approximately 7% during compressive deformation. By detailed examination of the microstructure, we provide direct evidence for nanoscale multistep shear band formation in the Zr₆₅Al_7.5Ni₁₀Pd_17.5 metallic glass. A novel nanoscale structure where fcc Zr₂Ni nanocrystalline particles are arranged in “bandlike” areas in the glassy matrix is observed near the compressive fracture tip. The suppression of the propagation of the shear bands due to dynamic nanocrystallization causes this structure. Furthermore, the results are recognized as a novel phenomenon, a nanoscale dynamic structural change by shear band propagation, and provide a new method for improving the mechanical properties of bulk metallic glasses.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (6), 1327-1335, 2007

  公益社団法人 日本金属学会

キーワード

• metallic glasses
• zirconium-based alloy
• ductility
• transformations
• shear bands
• nanocrystallization
• local structure

詳細情報

• CRID: 1390282679227822976
• NII論文ID: 10019486426
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mf200615
• COI: 1:CAS:528:DC%2BD2sXnvVWru7w%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 8742248
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8742248
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/6/48_MF200615/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可