Microstructures and Mechanical Properties of Ni-Nb Aluminides Produced by MA Process.

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概要

• 論文の詳細を見る

• Of all the intermetallics that belong to Ni-Nb-Al system, (Ni3Al+Ni3Nb), (NiAl+NiAlNb), (NiAl+Ni3Al), NiAl and Ni3Al were produced by mechanical alloying (MA) process with a view to refining microstructures. MA was carried out in the attritor mill using pure nickel, pure niobium powder and NiAl prealloyed powder as starting materials. MA powders were consolidated using the vacuum hot pressing.Sintered aluminides showed fine grain structures with average grain diameter under 5 μm and relative density above 96%. The combination of high strength and large fracture strain of more than 10% at room temperature was confirmed by compression test for each aluminide except for both (NiAl+NiAlNb) and (Ni3Al+Ni3Nb). At high temperatures, these aluminides exhibited a steady state deformation and no fracture during the testing. The strain rate sensitivity exponent (m value) of more than 0.3 was obtained for alloys except NiAl. Especially the highest value of m (>0.6) was observed for (Ni3Al+Ni3Nb) at 1 173 K. Such large m value more than 0.3 is believed to be associated with the development of superplasticity.

• The Iron and Steel Institute of Japanの論文

著者

• DOI Yoshiharu

  Toyama Industrial Technology Center

• Kojima Yo

  Nagaoka Univ. Technol. Nagaoka Jpn

• Kojima Yo

  Nagaoka University of Technology

• Ochiai Shouichi

  The Nishi Tokyo University

• Shirokura Takashi

  Graduate Student, Nagaoka University of Technology

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• Microstructures and Mechanical Properties of Ni-Nb Aluminides Produced by MA Process.

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