Comparative studies of surface composition in polycrystalline and nanocrystalline LaNi4.2Al0.8 alloys.

• Autorzy: Smardz L. , Jurczyk M. , Smardz K. , Nowak M.

Warianty tytułu

PL

Badania porównawcze składu powierzchni w polikrystalicznych i monokrystalicznych stopach LaNi4,2Al0,8.

• Konferencja: XVIth Physical Metallurgy and Materials Science Conference on Advanced Materials and Technologies AMT'2001, Gdańsk-Jurata, 16-20 September 2001
• Języki publikacji: PL

Abstrakty

EN

The surface chemical compositions of nanocrystalline LaNi4.2Al0.8 alloys was studied by Auger electron spectroscopy and compared to that of a polycrystalline sample. Results showed that the surface segregation of La atoms in the mechanically alloyed nanocrystalline LaNi4.2Al0.8 alloy is stronger compared to that of polycrystalline powders from arc-melted ingots. On the other hand, the level of oxygen impurities trapped in the mechanically alloyed powder during the processing is practically the same as in the arc-melted ingots. Small amounts of Fe impurities, which strongly segregate to the surface, could be responsible for the observed a little lower hydrogen storage capacity of the MA nanocrystalline LaNi4.2Al0.8 alloy compared to that of polycrystalline samples.

Słowa kluczowe

PL

skład chemiczny; powierzchnia; stop nanokrystaliczny; stop polikrystaliczny; proszki stapiane mechanicznie; spektroskopia elektronów Augera

EN

chemical composition; surface; nanocrystalline alloy; polycrystalline alloy; mechanically alloyed powders; Auger electron spectroscopy

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2001
• Tom: R. XXII, nr 5
• Strony: 854--856
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Smardz L.

• Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland

autor

Jurczyk M.

• Institute of Materials Science and Engineering, Poznań University of Technology, Poznań, Poland

autor

Smardz K.

• Institute of Materials Science and Engineering, Poznań University of Technology, Poznań, Poland

autor

Nowak M.

• Institute of Materials Science and Engineering, Poznań University of Technology, Poznań, Poland

• Polish Academy of Sciences, Institute of Molecular Physics, Poznań, Poland

Bibliografia

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