Anisotropic diffusion behaviour of 60Co in decagonal Al-Ni-Co single quasicrystals

T. H. Zumkley, H. Nakajima, J. Q. Guo, A. P. Tsai

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The orientation dependence of 60Co self-diffusion has been investigated in stable decagonal single quasicrystals of Al72.2Ni11.8Co16.0by means of the radiotracer method. Over a wide range from 803 to 1210 K the temperature dependence of the Co diffusivities along the periodic (tenfold-axis) and the aperiodic (twofold-axis) directions can be described each by a single set of Arrhenius parameters. The temperature dependence of the diffusion coefficients yields the Arrhenius parameters Dper= 1.54 x 10-1m2s-1Qper= 277.4 kJ mol-1D0per=396x10-1m2s-1and Qper= 289.0kJmor1, respectively. The mobility of Co is slightly faster along the periodic direction. This anisotropic effect is discussed in the content of results of analogous diffusion investigation in icosahedral quasicrystals from our laboratory and with literature data on quasicrystals. It is concluded that Co diffusion in decagonal Al-Ni-Co quasicrystals in the periodic as well as in the aperiodic direction in the entire temperature range very probably occurs via a vacancy mechanism.

本文言語English
ページ(範囲)205-213
ページ数9
ジャーナルPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
82
1
DOI
出版ステータスPublished - 2002 1月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 材料科学(全般)
  • 凝縮系物理学
  • 物理学および天文学(その他)
  • 金属および合金

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