PRECIPITATION BEHAVIOUR AND HARDENING OF B2-ORDERED Ni(Al, Ta)

Abstract

Abstract: Precipitation of Ni2Al in supersaturated NiAl containing Ta and corresponding hardening have been investigated by hardness measurements and by transmission electron microscope observations. Selected area electron diffraction, high resolution electron microscopy and energy dispersive X-ray spectrometer analysis have shown that the Ni2Al with a hexagonal structure precipitates coherently in the B2-NiAl matrix. Ni2Al is an ordered phase with a. unit cell parameter, aNi2All=aNiAl and CNi2Al= aNiAl. The orientation relationship between the Ni2Al precipitate and the B2-NiAl matrix is (0001)Ni2Al (111)NiAl and [1120]Ni2Al[110]NiAl. NiAlhardens appreciably by the precipitation of Ni2Al phase.

Key words: intermetallic compound, precipitation hardening, TEM, HREM, EDS

W.H. Tian and M. Nemoto2(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China)(Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, 812,Fukuoka, Japan). PRECIPITATION BEHAVIOUR AND HARDENING OF B2-ORDERED Ni(Al, Ta)[J]. Acta Metallurgica Sinica (English Letters), 1997, 10(2): 99-104.

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PRECIPITATION BEHAVIOUR AND HARDENING OF B2-ORDERED Ni(Al, Ta)

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