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)
金属学报(英文版)
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.
关键词:
nickel aluminide
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