MICROSTRUCTURES AND MECHANICAL PROPERTIES OF β-NiA1 CONTAINING α-Fe PRECIPITATES

Abstract

Abstract: The microstructures of B2-ordered NiA1 containing α-Fe precipitates have been investigated in terms of transmission electron microscopy. Fine precipitation of α-Fe (bcc structure) occurs in NiA1 by aging around 973K. The aging behavior was investigated by microhandness measurements and the temperature dependence of the yield strength of precipitate- comaining B2- ordered NiA1 was investigated by compression tests over the temperature range of 673-1273K. The fine precipitation of α-Fe was found to enhance greatly the low and intermediate temperature yield strength. When the deformation temperature is over 1073K, the strength of precipitate- containing NiA1 was comparable to ternary solid solution hardening NiA1-Fe. Dislocations bypass the particles during deformation and typical Orowan loops were observed surrounding the or-Fe particles after deformation.

Key words: nickel aluminide, based on NiA1, age-hardening, mechanical property, precipitate

W.H. Tian, A.L. Fan and M. Nemoto (Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China; Sasebo National College of Technology, Okishin 1-1, Sasebo 857-1193, Japan). MICROSTRUCTURES AND MECHANICAL PROPERTIES OF β-NiA1 CONTAINING α-Fe PRECIPITATES[J]. Acta Metallurgica Sinica (English Letters), 2000, 13(5): 1023-1028.

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MICROSTRUCTURES AND MECHANICAL PROPERTIES OF β-NiA1 CONTAINING α-Fe PRECIPITATES

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