On the Internal Friction of Sintered Cu-Al-Ni Ternary Alloys

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  • Cu-Al-Ni3元系焼結合金の内部摩擦
  • Cu Al Ni 3ゲンケイ ショウケツ ゴウキン ノ ナイブ マサツ

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Abstract

Effects of chemical compositions, porosities and cooling rates on the maximum internal friction were examined for sintered Cu-Al-Ni ternary alloys which were heat-treated after sintering, and the results obtained are as follows.<BR>(1) The maximum value of Q−1max in sintered Cu-Al-8 wt%Ni alloys with different Al contents was obtained at 14 wt%Al.<BR>(2) The value of Q−1max in sintered Cu-14 wt%Al-Ni alloys increased with increasing Ni content and showed a maximum value at 8 wt%Ni, where the value of Q−1max is propotional to the amount of γ′ martensite.<BR>(3) The value of Q−1max in sintered Cu-14 wt%Al-8 wt%Ni alloys increased slightly with increasing porosity. On the other hand, the Q−1max was kept constant at the rates higher than 300°C/min after showing a linear increase with increasing cooling rate up to about 300°C/min. These results indicated that Q−1max depended on the amount of γ′ martensite rather than that of porosities, where γ′ single phase martensite could be obtained from the sintered Cu-14 wt%Al-8 wt%Ni cooled at the rates higher than 300°C/min.

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