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Prediction of good glass forming ability in amorphous soft magnetic alloys by thermocalc simulation with experimental validation

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [3];  [4]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Materials Science and Engineering; Carnegie Mellon University
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Materials Science and Engineering
  3. Carpenter Technologies, Reading, PA (United States)
  4. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Alloys in a (Fe70Ni30)80(BeSieNb)20 system, with good glass forming ability (GFA), were identified using Thermocalc software to simulate liquidus temperatures (T's) and solidification ranges (areas between the liquidus and solidus in a binary phase diagram,a line at fixed T). Here, a region with excellent GFA was identified at 14-18% B and 0-7% Si with the balance Nb, showing minima in liquidus and solidification range. A region with a solidification range minimum, but no corresponding liquidus minimum was identified at 3-8% B and 5-10% Si but had lower GFA. A shallow liquidus minimum, with no minimum in solidification range, at 3-5% B and 1-3% Si had the lowest GFA and did not produce amorphous material. Measured GFA was ranked using parameters Trg, DTxg, and γm, defined herein. Only the reduced glass transition temperature, Trg, was predictive for the alloys. Differential Scanning Calorimetry (DSC) data showed liquidus T's to agree. Curie temperatures, Tc's were observed to increase with B/Nb ratio. Simulations of liquidus and solidification range for alloys with 18 and 15% glass formers do not show regions with minima in both, indicating good GFA is not expected.
Research Organization:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007867
OSTI ID:
1574684
Alternate ID(s):
OSTI ID: 1564317
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 814; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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