Neutron diffraction study of the structure and low-temperature phase transformation in ternary NiAl + M (M = Ni, Fe, Co) alloys

L Yang,X.-L Wang,C.T Liu,J.A Fernandez-Baca,C.L Fu,J.W Richardson,D Shi

doi:10.1016/j.scriptamat.2006.12.043

Neutron diffraction study of the structure and low-temperature phase transformation in ternary NiAl + M (M = Ni, Fe, Co) alloys

L Yang, X.-L Wang + Show 5 more

https://doi.org/10.1016/j.scriptamat.2006.12.043

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Journal: Scripta materialia	Publication Date: Feb 26, 2007
Citations: 7

Affiliation: University of Cincinnati, University of Tennessee at Knoxville, Oak Ridge National Laboratory

#Low-temperature Phase Transformation #Extra Peaks + Show 8 more

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Abstract

Neutron diffraction was used to study the structure of ternary NiAl + M (M = Ni, Fe, Co) alloys. The experiment confirmed the predictions by first-principle calculations on site preference by solute atoms. Moreover, a universal structural transformation was observed below 20 K in alloys where Al is partially replaced by M. The extra peaks at low-temperatures do not match those from known martensite phases, but are well indexed by a cubic structure. A possible mechanism for the low-temperature phase is discussed.

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