Synthesis, characterization and mechanical properties of nanocrystalline NiAl.

• Autorzy: Dollar M. , Choudry M. , Estman J.
• Konferencja: XV Physical Metallurgy and Materials Science Conference on Advanced Materials & Technologies AMT'98, Kraków-Krynica, Poland, 17-21 May, 1998
• Języki publikacji: EN

Abstrakty

EN

Nanocrystalline, ordered NiAl (n-NiAl) was successfully synthesized and compacted at various temperatures. The as-consolidated specimens exhibit grain sizes between 2 and 12 nm, a homogeneous chemical composition, and densities between 78 and 94% of the theoretical density, increasing with increasing compaction temperature. Microhardness of the n-NiAl increases with increasing grain size and density, above all as a result of reduced porosity following compaction at increasing temperatures. The present material is significantly stronger than its conventional countepart but not as strong as predicted by Hall-Petch-type modelling. Also, in the nanocrystalline form, NiAl exhibits room temperature ductility, unlike its coarsegrained countepart. The mechanical behaviour of n-NiAl can be rationalized assuming that diffusional - rather than location - mechanisms control strength and ductility of nanocrystalline materials.

Słowa kluczowe

EN

crystalline material; chemical composition; annealing; nickel; aluminium; compact; powder; physical vapor deposition

PL

materiał krystaliczny; skład chemiczny; wyżarzanie; nikiel; aluminium; wypraska; proszek; osadzanie fizyczne z pary

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 1998
• Tom: R. XIX, nr 4
• Strony: 803--812
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Dollar M.

• Illinois Institute of Technology, Chicago, USA

autor

Choudry M.

• Westinghouse Electric Corporation, Orlando, USA

autor

Estman J.

• Argonne National Laboratory, Argonnes, USA

• Illinois Institute of Technology, Chicago

Bibliografia

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