Preparation, structure and physical properties of Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr or Hf - Part IV

Thermal stability; DSC, TEM and thermomagnetic studies

Ferdinand Sommer, Tivadar Tarnóczi, Krassimir Russew, A. Cziráki, L. Kiss, L. Varga, I. Bakonyi

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Abstract

In this part of a series of papers on Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr of Hf, the results of a study of the thermal stability by differential scanning calorimetry, transmission electron microscopy and thermo-magnetic measurements will be described for the amorphous Zr-Fe, Zr-Co and Zr-Ni as well as the bcc-Ni(Zr) alloy ribbons. For the amorphous alloys, a general tendency is that both the crystallization temperature and the enthalpy of crystallization decreases in the sequence Fe → Co → Ni. A comparison of two a-Zr9Fe91 ribbons prepared with different quenching rates revealed that for the lower quenching rate the activation energy and the crystallization temperature are slightly smaller due to the larger number of quenched-in nuclei. For the a-Zr9Co91 alloy, the crystallization products were found to be fcc-Co + Zr6Co23 and although a single differential scanning calorimetry (DSC) peak only occurs, transmission electron microscopy (TEM) studies indicated that the precipitation of Zr6Co23 precedes the appearance of fcc-Co. For the Ni-based alloys, the phase transformation occurs at practically the same temperatures for both the amorphous and bcc states and the final phases are the same (fcc-Ni + ZrNi5). The transformation temperatures determined from thermomagnetic measurements agreed well with the corresponding DSC data and the magnetization changes accompanying the phase transformation could be well interpreted on the basis of DSC and TEM results.

Original languageEnglish
Pages (from-to)256-266
Number of pages11
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume89
Issue number4
Publication statusPublished - Apr 1998

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Crystallization
ribbons
Differential scanning calorimetry
Thermodynamic stability
thermal stability
heat measurement
Physical properties
physical properties
crystallization
Transmission electron microscopy
preparation
transmission electron microscopy
scanning
phase transformations
Quenching
Phase transitions
quenching
Temperature
temperature
Magnetic variables measurement

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

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title = "Preparation, structure and physical properties of Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr or Hf - Part IV: Thermal stability; DSC, TEM and thermomagnetic studies",
abstract = "In this part of a series of papers on Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr of Hf, the results of a study of the thermal stability by differential scanning calorimetry, transmission electron microscopy and thermo-magnetic measurements will be described for the amorphous Zr-Fe, Zr-Co and Zr-Ni as well as the bcc-Ni(Zr) alloy ribbons. For the amorphous alloys, a general tendency is that both the crystallization temperature and the enthalpy of crystallization decreases in the sequence Fe → Co → Ni. A comparison of two a-Zr9Fe91 ribbons prepared with different quenching rates revealed that for the lower quenching rate the activation energy and the crystallization temperature are slightly smaller due to the larger number of quenched-in nuclei. For the a-Zr9Co91 alloy, the crystallization products were found to be fcc-Co + Zr6Co23 and although a single differential scanning calorimetry (DSC) peak only occurs, transmission electron microscopy (TEM) studies indicated that the precipitation of Zr6Co23 precedes the appearance of fcc-Co. For the Ni-based alloys, the phase transformation occurs at practically the same temperatures for both the amorphous and bcc states and the final phases are the same (fcc-Ni + ZrNi5). The transformation temperatures determined from thermomagnetic measurements agreed well with the corresponding DSC data and the magnetization changes accompanying the phase transformation could be well interpreted on the basis of DSC and TEM results.",
author = "Ferdinand Sommer and Tivadar Tarn{\'o}czi and Krassimir Russew and A. Czir{\'a}ki and L. Kiss and L. Varga and I. Bakonyi",
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T1 - Preparation, structure and physical properties of Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr or Hf - Part IV

T2 - Thermal stability; DSC, TEM and thermomagnetic studies

AU - Sommer, Ferdinand

AU - Tarnóczi, Tivadar

AU - Russew, Krassimir

AU - Cziráki, A.

AU - Kiss, L.

AU - Varga, L.

AU - Bakonyi, I.

PY - 1998/4

Y1 - 1998/4

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AB - In this part of a series of papers on Fe-, Co- and Ni-rich melt-quenched ribbons containing Zr of Hf, the results of a study of the thermal stability by differential scanning calorimetry, transmission electron microscopy and thermo-magnetic measurements will be described for the amorphous Zr-Fe, Zr-Co and Zr-Ni as well as the bcc-Ni(Zr) alloy ribbons. For the amorphous alloys, a general tendency is that both the crystallization temperature and the enthalpy of crystallization decreases in the sequence Fe → Co → Ni. A comparison of two a-Zr9Fe91 ribbons prepared with different quenching rates revealed that for the lower quenching rate the activation energy and the crystallization temperature are slightly smaller due to the larger number of quenched-in nuclei. For the a-Zr9Co91 alloy, the crystallization products were found to be fcc-Co + Zr6Co23 and although a single differential scanning calorimetry (DSC) peak only occurs, transmission electron microscopy (TEM) studies indicated that the precipitation of Zr6Co23 precedes the appearance of fcc-Co. For the Ni-based alloys, the phase transformation occurs at practically the same temperatures for both the amorphous and bcc states and the final phases are the same (fcc-Ni + ZrNi5). The transformation temperatures determined from thermomagnetic measurements agreed well with the corresponding DSC data and the magnetization changes accompanying the phase transformation could be well interpreted on the basis of DSC and TEM results.

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