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X-ray diffraction study of the effect of boron on lattice properties of Ni76Al24

Published online by Cambridge University Press:  31 January 2011

Mohan P.V. Rao ,
Murthy K. Satyanarayana ,
S.V. Suryanarayana  and
Naidu S.V. Nagender
Mohan P.V. Rao
Affiliation:
Department of Physics, Osmania University, Hyderabad, AP 500 007, India
Murthy K. Satyanarayana
Affiliation:
Department of Physics, Osmania University, Hyderabad, AP 500 007, India
S.V. Suryanarayana
Affiliation:
Department of Physics, Osmania University, Hyderabad, AP 500 007, India
Naidu S.V. Nagender
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad, India
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Abstract

A small addition of boron is suggested to increase the ductility of the polycrystalline Ni3Al when the Al content is less than 25 at.%. Both metallographic and x-ray investigation have shown the alloys of Ni3Al (24 at.% Al) containing 0.20, 0.42, 0.79, 0.98, and 1.22 at.% B to be of single phase and that of 1.76 at.% B to be of two phase. With the addition of boron, the lattice parameter of the Ni3Al phase is found to increase. Microhardness measurements indicate that initially the hardness decreases for the alloy of 0.20 at.% B, while for the rest of the single phase alloys the hardness is found to increase with further addition of boron. The addition of boron increases the deformation stacking fault probability value except for the alloy with 0.20 at.% B.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 4 , April 1993 , pp. 741 - 744
Copyright
Copyright © Materials Research Society 1993

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