β-NiAl中におけるL2<SUB>1</SUB>-Ni<SUB>2</SUB>AlHf相の析出

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タイトル別名
  • Precipitation of L2<SUB>1</SUB>-Ni<SUB>2</SUB>AlHf Phase in β-NiAl
  • β-NiAl中におけるL21-Ni2AlHf相の析出
  • ベータ NiAlチュウ ニ オケル L21-Ni2AlHfソウ ノ セキシュツ
  • Precipitation of L2<SUB>1</SUB>-Ni<SUB>2</SUB>AlHf Phase in &beta;-NiAl

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Microstructural variations and correlated hardness changes in a β-NiAl containing different amounts of Hf have been investigated in terms of transmission electron microscopy and hardness tests. The alloys harden appreciably by aging after quenching from higher temperatures. At the beginning of aging, fine plate-like L21-type Ni2AlHf precipitates are formed on the {111} planes of the NiAl matrix keeping the lattice coherency with the NiAl matrix. The orientation relationship between the Ni2AlHf precipitate and the NiAl matrix is ⟨100⟩Ni<SUB>2AlHf</SUB>\varparallel⟨100⟩NiAl, {001}Ni<SUB>2AlHf</SUB>\varparallel{001}NiAl. By prolonged aging Ni2AlHf precipitates lose their coherency and change their morphology to the spherical ones surrounded by misfit dislocations. The orientation relationship between the NiAl matrix and the Ni2AlHf precipitates, however, is kept even after prolonged aging. The lattice misfit between the Ni2AlHf precipitate and the NiAl matrix is estimated from the electron diffraction patterns and the spacings of misfit dislocations to be approximately 4.5% at 1173 K, which is about four times as large as that of the NiAl-Ni2AlTi system. It is suggested that the interfacial energy and the magnitude of lattice misfit strongly affect the age hardening behavior and the morphology of precipitates in this alloy.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 61 (4), 282-290, 1997

    公益社団法人 日本金属学会

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