HIGH-PRESSURE STUDY OF Ti50Ni25Fe25 POWDER PRODUCED BY MECHANICAL ALLOYING

HIGH-PRESSURE STUDY OF Ti50Ni25Fe25 POWDER PRODUCED BY MECHANICAL ALLOYING

Ferreira, A. S.; Rovani, P. R.; de Lima, J. C.; Pereira, A. S.

Abstract:

A nanostructured Ti50Ni25Fe25 phase (B2) was formed by mechanical alloying and its structural stability was studied as a function of pressure. The changes were followed by X-ray diffraction. The B2 phase was observed up to 7 GPa, and for larger pressures, the B2 phase transformed into a trigonal/hexagonal phase (B19) that was observed up to the highest pressure used (18 GPa). Besides B2 and B19, a segregation of elemental Ni and the formation of FeNi3 were observed. With decompression, the B2 phase was recovered. Values of bulk modulus for the B2, B19, elemental Ni and FeNi3 phases were obtained by fitting the pressure dependence of the volume to a Birch–Murnaghan equation of state (BMEOS).

A nanostructured Ti50Ni25Fe25 phase (B2) was formed by mechanical alloying and its structural stability was studied as a function of pressure. The changes were followed by X-ray diffraction. The B2 phase was observed up to 7 GPa, and for larger pressures, the B2 phase transformed into a trigonal/hexagonal phase (B19) that was observed up to the highest pressure used (18 GPa). Besides B2 and B19, a segregation of elemental Ni and the formation of FeNi3 were observed. With decompression, the B2 phase was recovered. Values of bulk modulus for the B2, B19, elemental Ni and FeNi3 phases were obtained by fitting the pressure dependence of the volume to a Birch–Murnaghan equation of state (BMEOS).

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DOI: 10.5151/phypro-sic100-052

Como citar:

Ferreira, A. S.; Rovani, P. R.; de Lima, J. C.; Pereira, A. S.; "HIGH-PRESSURE STUDY OF Ti50Ni25Fe25 POWDER PRODUCED BY MECHANICAL ALLOYING", p-52-52. In: Proceedings of the International Symposium on Crystallography [Blucher Physics Proceedings, v.1, n.3]. São Paulo: Blucher, 2015.
ISSN 23582359, DOI 10.5151/phypro-sic100-052