TEM and HREM structure characterization of ball milled intermetallic compounds.

• Autorzy: Maziarz W. , Lityńska L. , Dutkiewicz J.
• Konferencja: 5th Polish-Japanese Symposium on Advanced Methods of Materials Characterization, Niedzica, 28.08-2.09.2004
• Języki publikacji: EN

Abstrakty

EN

Phase transitions and structure changes of several intermetallic alloys of gamma-TiAl and ß-NiAl base subjected to ball milling were investigated. It has been shown that in the case of gamma-TiAl alloys the ball milling process allows to obtain the fully amorphous phase after 60 hrs of milling, whereas in ß-NiAl alloys the formation of ß phase was observed already in the early stages of milling and only refinement of crystallite size down to nanometer scale was observed after the longest milling times. TEM observations revealed an amorphous band like structure with a high degree of chemical homogeneity in gamma-TiAl alloys milled for 60 h. However, dark field observations allowed to identify very small crystals of he size of a few nanometers within the amorphous matrix. The structure of ß-NiAl alloys has a nanocrystalline character with mean crystallite size close to 10 nm. The HREM studies allowed to identify both the individual nanocrystals of gamma-TiAl phase within the amorphous matrix and to estimate their size as well as the lamellar alpha2/gamma/alpha2 nanostructure. HREM observations of ß-NiAl alloys confirmed the presence of B2 intermetallic solid solution. The size of crystals varies across the sample and can be estimated between 2 and 7 nm, what is in a good agreement with the X-ray data.

Słowa kluczowe

EN

TEM; HREM; structure characterization; intermetallic compounds; ball milling

• Wydawca: Komitet Nauki o Materiałach PAN
• Czasopismo: Archives of Materials Science
• Rocznik: 2005
• Tom: Vol. 26, nr 1-2
• Strony: 45--51
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Maziarz W.

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland

autor

Lityńska L.

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland

autor

Dutkiewicz J.

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland

Bibliografia

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