Abstract
High-temperature X-ray diffraction and TEM studies were conducted on nickel-rich boron-doped Ni3Al in order to confirm our earlier observations on the existence of a structural transformation in these alloys. The results obtained are discussed through a model proposed. The L12 structure appears to transform to another L12 or to a DO22 structure during heating. Such a transformation starts at around 700 °C and seems to complete around 1100 °C and appears to be of a continuous type. In the temperature range 700–1100 °C both phases coexist, which causes a tetragonal distortion of the L12 lattice giving rise to a tweed morphology in TEM observations. The transformation mechanism involves a periodic modulation of lattice constant. The calculated values for this periodicity (expressed as a number of unit cells in the [100] direction) obtained from X-ray diffraction (L = 62, 70, 74) matched well with that (L = 65) obtained using TEM.
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Ramesh, R., Pathiraj, B. & Kolster, B.H. TEM and high-temperature X-ray diffractometric studies on the structural transformations in Ni3Al. Journal of Materials Science 29, 4764–4770 (1994). https://doi.org/10.1007/BF00356521
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DOI: https://doi.org/10.1007/BF00356521