Electron microscopy study of the formation of Ni5Al3 in a Ni62.5Al37.5 B2 alloy-I. Precipitation and growth

Dominique Schryvers, Ying Ma, L. Tóth, Lee Tanner

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Abstract

The formation and growth of Ni5Al3 precipitates found inside an annealed B2 matrix in Ni62.5Al37.5 samples is described on the basis of conventional and high resolution electron microscopy images and electron diffraction patterns. Short anneals introduce three-pointed star shaped precipitates consisting of twin related segments with different variants of the Ni5Al3 structure. Longer anneals result in separate plates growing from these wings and developing microtwinning in order to accommodate stress built-up at the interfaces with the surrounding matrix. Two different growth mechanisms were observed and are discussed. The lattice distortions are found to be much higher in the small precipitates than in the large microtwinned plates.

Original languageEnglish
Pages (from-to)4045-4056
Number of pages12
JournalActa Metallurgica et Materialia
Volume43
Issue number11
DOIs
Publication statusPublished - 1995

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Electron microscopy
Precipitates
High resolution electron microscopy
Electron diffraction
Diffraction patterns
Stars

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Electron microscopy study of the formation of Ni5Al3 in a Ni62.5Al37.5 B2 alloy-I. Precipitation and growth. / Schryvers, Dominique; Ma, Ying; Tóth, L.; Tanner, Lee.

In: Acta Metallurgica et Materialia, Vol. 43, No. 11, 1995, p. 4045-4056.

Research output: Contribution to journalArticle

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