An Analysis of Crystallization Process in Amorphous Alloys Using Time-Scaling Factor

• Takahara Yoshihiro

  Department of Materials Science and Engineering, Kyushu Institute of Technology

• Narita Nobutaka

  Department of Materials Science and Engineering, Kyushu Institute of Technology

書誌事項

タイトル別名

• Analysis of Crystallization Process in Amorphous Alloys Using Time Scaling Factor

抄録

We have investigated the time-scaling properties of the isothermal crystallization process for Cu₆₆Ti₃₄ and Zr₆₅Cu₃₅ amorphous alloys by differential scanning calorimetry. Local atomic structures have also been studied by extended X-ray absorption fine structure (EXAFS) measurements. The results are discussed in comparison with the previous results obtained for metal-metalloid amorphous alloys. The time-scaling factor is defined as the time when the crystallization has reached half completion. By rescaling the time axis for each annealing temperatures, the crystallization curves measured at various temperatures for each alloy can be superimposed on a single curve in each case. The Williams-Landel-Ferry formula based on a free-volume consideration gives a universal function for the temperature dependence of the time-scaling factor for all the alloys. This suggests that we have to take into account the relaxation process occurring in the amorphous phase during the crystallization. The WLF analysis reveals that there exists a significant difference in the temperature dependence of the scaling factor between the metal-metal and metal-metalloid amorphous alloys. From the EXAFS study, such difference is considered to be due to the local structural differences between those two types of amorphous alloys.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 44 (4), 700-704, 2003

  公益社団法人 日本金属学会

キーワード

• time-scaling
• crystallization
• amorphous alloy
• Williams-Landel-Ferry formula
• local atomic structure
• extended X-ray absorption fine structure

詳細情報

• CRID: 1390282679223006080
• NII論文ID: 130004452049
• NII論文ID: 10011911122
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.44.700
• COI: 1:CAS:528:DC%2BD3sXkslCltrg%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 6513920
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6513920
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/44/4/44_4_700/_pdf
• 本文言語コード: en
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