Author： Chowdhury S.G.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3036
Source： Philosophical Magazine Letters, Vol.74, Iss.5, 1996-11, pp. : 327-330
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Abstract
The Ni3Al (L12) intermetallic compound after boron doping becomes ductile. It is argued that grain-boundary segregation is not the only cause of the increase in ductility. It is pointed out that the L12 structure undergoes transformation to D022 during deformation, and during the deformation of this D022 structure the material fails. With the addition of boron, the stability of the L12 structure is enhanced with respect to D022 and slows the transformation rate. Therefore the nucleation and propagation of cracks become inhibited. Numerous experimental observations have been explained with the proposed mechanism.
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