Relaxation and Crystallization Behavior of the Zr50Cu40Al10 Metallic Glass

• Yano Takaaki

  Department of Materials Science, Osaka Prefecture University

• Yorikado Yuhi

  Department of Materials Science, Osaka Prefecture University

• Akeno Yasutake

  Graduate School of Engineering, University of Hyogo

• Hori Fuminobu

  Department of Materials Science, Osaka Prefecture University

• Yokoyama Yoshihiko

  Institute for Materials Research, Tohoku University

• Iwase Akihiro

  Department of Materials Science, Osaka Prefecture University

• Inoue Akihisa

  Institute for Materials Research, Tohoku University

• Konno Toyohiko J.

  Department of Materials Science, Osaka Prefecture University

書誌事項

タイトル別名

• Relaxation and Crystallization Behavior of the Zr<SUB>50</SUB>Cu<SUB>40</SUB>Al<SUB>10</SUB> Metallic Glass

抄録

We examined relaxation and crystallization behavior of the ternary Zr₅₀Cu₄₀Al₁₀ metallic glass by using positron annihilation and transmission electron microscopy (TEM). Observed changes in positron annihilation lifetime of the alloy annealed isothermally at 673 K, which is below the glass transition temperature, correlate well with observed density changes; while coincidence Doppler broadening (CDB) spectra exhibit no significant change. These observations demonstrate that free volume decreases without a rearrangement of atoms during structural relaxation. On the other hand, CDB spectrum has exhibited considerable changes when the same alloy was annealed at 773 K. TEM observations suggested that crystallization occurs via growth of spherulites of several hundred nm in diameter, which themselves are composed of radially grown grains. Chemical analysis revealed that Cu atoms are partitioned out during the growth of the spherulites. Diffraction study indicated that the unit cell of the crystalline phase belong to an orthorhombic system with a=0.892, b=0.550, and c=1.060 nm; while remaining inter-spherulite regions are found to crystallize into an fcc phase with a=1.28 nm, which is probably isostructural to the τ₃ phase.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 46 (12), 2886-2892, 2005

  公益社団法人 日本金属学会

キーワード

• bulk metallic glass
• structural relaxation
• crystallization
• positron annihilation
• transmission electron microscopy

詳細情報

• CRID: 1390001204250483712
• NII論文ID: 130004452726
• NII論文ID: 10017150197
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.46.2886
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7757976
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7757976
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/46/12/46_12_2886/_pdf
• 本文言語コード: en
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