RETRACTED ARTICLE: Dislocation-particle interaction in precipitation strengthened Ll2-ordered Ni3Al

Han, Chang Suk

doi:10.1007/bf03027820

Cited by 4 publications

(2 citation statements)

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“…In Ni 3 (Al,Ti) containing fine dispersion of coherent disordered γ, deformation induced superdislocations are strongly attracted to the disordered particles and tend to be uncorrelated by the absence of an antiphase boundary in the particle [17]. In the present case, the matrix is B2-ordered and the α-Cr precipitates are disordered.…”

Section: Dislocation-particle Interactionmentioning

confidence: 80%

“…The α-Cr particle, in fact, is regarded as having an APB energy of zero, compared with the NiAl matrix, in which the APB energy is known to be very high. We can thus expect that the dislocations in the NiAl matrix will be attracted to the α-Cr precipitates for the same reason operating in Ni3Al containing a fine dispersion of disordered γ [17]. However, a contrast analysis by TEM revealed that the deformation induced dislocations with only b=<100> which is not the Burgers vector of superdislocations in NiAl and will never dissociate into two superpartials.…”

Section: Dislocation-particle Interactionmentioning

confidence: 87%

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RETRACTED ARTICLE: The behavior of α-Cr precipitation on the high temperature deformation of B2-ordered NiAl

2009

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Transmission electron microscope investigation has been performed concerning the effect of Cr-precipitation on the mechanical properties of B2-ordered NiAl containing 4 mol.% to 8 mol.% of Cr. By aging at temperatures around 973 K after solution annealing, fine spherical precipitates appeared homogeneously in the NiAl matrix and the alloys hardened appreciably. The selected area electron diffraction patterns have not revealed any additional extra-spots during aging, because the Cr-particles have a cube-cube orientation relationship and keep perfect coherency with the ordered matrix lattice. Dislocations bypass the particles during deformation. Although the dispersion of Cr-particles increases the yield strength of NiAl at intermediate temperature, the strength decreases appreciably at higher temperatures. Atom location by channeling enhanced microanalysis technique has been used to determine the site occupancy of Cr in NiAl.

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Section: Dislocation-particle Interactionmentioning

confidence: 80%

Section: Dislocation-particle Interactionmentioning

confidence: 87%