Tensile Strength of Ni-Al-W Alloys at High Temperatures

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  • Ni-Al-W合金の高温抗張力
  • Ni-Al-W ゴウキン ノ コウオン コウチョウリョク

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This paper concerns the cathode materials which are required to conserve great strength even at high temperatures. Measurements were taken of the tensile strength and the specific electric resistance of Ni alloy wires, 0.06 mm in diameter, containing not more than 3.5%Al and not more than 4.9%W at 800°C in vacuum. In the meantime, we devised a high-temperature tensile-strength testing machine for fine wires. The results of our tests and measurements were as follows: The tensile strength of the alloys at 800°C increased according to an increase in the content of their alloying elements, and this phenomenon was particularly noticeable in the case of an increase in Al content, while the addition of Co had practically no effect on the increase of the tensile strength of the alloys. The tensile strength dwindled gradually as temperature went up. The specific electric resistance of the annealed alloys at room temperature increased with an increase in the contents of Al and W. To give an example, the tensile strength at 800°C and the specific electric resistance at room temperature of a 3.5%Al-4.9%W-Ni alloy stood at 25 kg/mm2 and 35 μΩ/cm, respectively.

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