STRUCTURE AND AGING BEHAVIOR OF AMORPHOUS Pd-Si ALLOYS

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概要

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• The amorphous Pd-Si alloys were prepared by two-piston type splat quenching technique, and the structure and aging behavior were studied by Mossbauer spectroscopy, X-ray diffraction and differential scanning calorimetry (DSC). ^<57>Fe and ^<119>Sn Mossbauer spectroscopies revealed that the average local atomic configuration of the amorphous Pd-Si alloys is similar to that of crystalline Pd_3Si except the effect of decrease in Si concentration and that a trigonal prism skeleton composed of Pd atoms with a Si atom at the body-center is a predominant structural unit for amorphous Pd-Si alloys. The Debye temperature in Pd_<80> Si_<20> alloy was estimated to be about 270 K from the temperature dependence of the Mossbauer spectra. In isochronal and isothermal annealings, the formation of the meta-stable phases was not detected appreciably and the amorphous phase showed excellent stability especially in the low temperature region below 530 K. The crystallization process of the amorphous Pd_<80>Si_<20> alloy was investigated by DSC. The glass transition temperature was estimated to be 645 K. The relation between transformation fraction and aging time deduced from DSC data was analyzed by the Johnson-Mehl-Avrami equation.

• 東北大学の論文

著者

• Ino H.

  Institute Of Industrial Science University Of Tokyo

• Nanao S.

  Institute of Industrial Science, University of Tokyo

• Tokumitsu K.

  Institute of Industrial Science, University of Tokyo

• Matsuzaki A.

  Institute of Industrial Science, University of Tokyo

• Nishikawa S.

  Institute of Industrial Science, University of Tokyo

• Nanao S.

  Institute Of Industrial Science University Of Tokyo

• Tokumitsu K.

  Institute Of Industrial Science University Of Tokyo

関連論文

• STRUCTURE AND AGING BEHAVIOR OF AMORPHOUS Pd-Si ALLOYS
• Formation of Millimeter-Sized Al-Cu-Ru Single Quasicrystals

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