Crystallization of Fe-Ni based amorphous alloy

Dóra Janovszky, Jenö Sólyom, András Roósz, Zsolt Czigány

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The devitrification of the Fe-Ni-B-Si amorphous ribbon was investigated by the differential scanning calorimetry (DSC) with scanning and isothermal methods. The devitrification of rapidly quenched ribbons is a multilevel process. On the basis of DSC investigations it was determined that crystallization occurs in three processes up to 700°C in the Fe 40Ni40B16Si4 alloy. In the present work the first and second steps have been discussed. The first crystallization step involves the segregation of the Fe-Ni crystalline solid solution from the amorphous matrix. During the second crystallization phase, in addition to austenite, nickel suicide and two types of iron borides crystallize as well. The ribbons were relaxed at 380°C for 2 hours, following the pre-annealing at different temperatures. Pre-annealing was performed in the DSC within the temperature range elapsing from 395°C to 420°C The preannealing at temperatures below the first exothermal DSC peak has an effect on the crystallization processes. After the pre-annealing the samples were investigated by DSC The DSC peak of the first crystallization step shifts to higher temperatures and decrease its enthalpy. The scanning DSC measurements, applied after the isothermal pre-annealing, were performed in order to determine the fraction of the ribbon transformed in the primary crystallization step. The second DSC peak shifts to lower temperatures with a maximum of 4°C. The X-ray diffraction (XRD) analyses reveal that the lattice constant changes with the pre-annealing temperatures. Such observation was also supported by the circumstance that the composition of the Fe-Ni solid solution undergoes certain modifications.

Original languageEnglish
Title of host publicationMaterials Science Forum
Pages185-190
Number of pages6
Volume537-538
Publication statusPublished - 2007
Event5th Hungarian Conference on Materials Science, Testing and lnformatics - Balatonfured, Hungary
Duration: Oct 9 2005Oct 11 2005

Publication series

NameMaterials Science Forum
Volume537-538
ISSN (Print)02555476

Other

Other5th Hungarian Conference on Materials Science, Testing and lnformatics
CountryHungary
CityBalatonfured
Period10/9/0510/11/05

Fingerprint

Amorphous alloys
Crystallization
Differential scanning calorimetry
Annealing
Temperature
Solid solutions
Boron Compounds
Scanning
Borides
Nickel
Austenite
Lattice constants
Enthalpy
Iron
Crystalline materials
X ray diffraction
Chemical analysis

Keywords

  • Amorphous alloy
  • Crystallization
  • DSC

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Janovszky, D., Sólyom, J., Roósz, A., & Czigány, Z. (2007). Crystallization of Fe-Ni based amorphous alloy. In Materials Science Forum (Vol. 537-538, pp. 185-190). (Materials Science Forum; Vol. 537-538).

Crystallization of Fe-Ni based amorphous alloy. / Janovszky, Dóra; Sólyom, Jenö; Roósz, András; Czigány, Zsolt.

Materials Science Forum. Vol. 537-538 2007. p. 185-190 (Materials Science Forum; Vol. 537-538).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Janovszky, D, Sólyom, J, Roósz, A & Czigány, Z 2007, Crystallization of Fe-Ni based amorphous alloy. in Materials Science Forum. vol. 537-538, Materials Science Forum, vol. 537-538, pp. 185-190, 5th Hungarian Conference on Materials Science, Testing and lnformatics, Balatonfured, Hungary, 10/9/05.
Janovszky D, Sólyom J, Roósz A, Czigány Z. Crystallization of Fe-Ni based amorphous alloy. In Materials Science Forum. Vol. 537-538. 2007. p. 185-190. (Materials Science Forum).
Janovszky, Dóra ; Sólyom, Jenö ; Roósz, András ; Czigány, Zsolt. / Crystallization of Fe-Ni based amorphous alloy. Materials Science Forum. Vol. 537-538 2007. pp. 185-190 (Materials Science Forum).
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