The Effect of Ti Content on α' Martensite Phase Transformation, and Magnetic Properties by Mössbauer Spectroscopy in Fe-30%Ni-x%Ti (wt%) Alloys

E. Yaşara, U. Erdemb, M. Akif Tunac, O. Armağanc, T. Kırındıd aDepartment of Physics, Science and Arts Faculty, Kırıkkale University, Yahsihan 71450, Kırıkkale, Turkey bScientific and Technological Research Laboratories, Kırıkkale University, Yahsihan 71450, Kırıkkale, Turkey cDepartment of Physics, Kırıkkale University, Graduate School of Natural and Applied Science, Yahsihan 71450, Kırıkkale, Turkey dDepartment of Mathematic and Science Education, Faculty of Education, Kırıkkale University, Yahsihan 71450, Kırıkkale, Turkey

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In this study, the influence of Ti content on the microstructure of the martensite bcc α'), which was formed by thermal effect, was investigated by scanning electron microscope and transmission electron microscope observations, in Fe-30Ni-xTi (x=0.8, 1.8, 2.6) alloys. The crystallographic orientation relationship between austenite fcc (γ) and thermally induced bcc (α') martensite was found to be as (111)γ/(011)α (Kurdjumov-Sachs (K-S)), by the electron diffraction analysis. The martensitic transformation temperature (Ms) of α' martensite was determined as -41°, -62°, and -76 ° in the alloys with 0.8%, 1.8%, and 2.6% Ti concentration, respectively. The Mössbauer spectrometer analysis has been revealed by a paramagnetic character for the austenite phase and magnetically order character for α' martensite phase. Hyperfine magnetic field, isomer shift and volume fractions of phases were determined by the Mössbauer spectroscopy.

DOI:10.12693/APhysPolA.133.1165 topics: martensitic transformation, Mössbauer spectroscopy, isomer shift, internal magnetic field