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Title: Structural stability of mechanically alloyed amorphous (FeCoNi)70Ti10B20 under high-temperature and high-pressure

Abstract

Nanostructured (FeCoNi)70Ti10B20 (at%) alloy was synthesized by mechanical alloying from elemental powder mixture of Fe, Co, Ni, Ti and B using ball milling. The effect of ball milling time on the evolution of structure and morphology was investigated by X-ray diffraction, scanning and transmission electron microscopy and differential thermal analysis. It was observed that the formation of solid solution of (FeCoNi)70Ti10B20 started from the very onset of the milling process. Crystallite size and lattice strains seemed to be leveled off after 20 h of milling with no further major changes. The milling process for longer periods introduced severe plastic deformations causing formation of amorphous phase of (FeCoNi)70Ti10B20. The amorphous alloy composition was confirmed by energy dispersive X-ray spectroscopy analysis that showed an excellent homogeneity of the alloying elements. The phase stability of the mechanically alloyed amorphous sample was further verified by employing high-temperature and high-pressure studies. The alloy samples heat-treated at 700 °C revealed crystallization of the amorphous phase. However, synchrotron-based high-pressure ambient temperature X-ray diffraction studies confirmed that the amorphous phase of the alloy remained stable up to the pressure of 30 GPa. Here, the 50 h milled sample after being annealed at 350 °C showed improvement in themore » soft magnetic properties of the alloy, which was due to the probable elimination of the residual stress in the amorphous phase of the alloy powders.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [5]
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  1. Zonguldak Bülent Ecevit Univ. (Turkey)
  2. Kırıkkale Univ. (Turkey)
  3. Hacettepe Univ., Ankara (Turkey)
  4. Uniformity Labs, Fremont, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1844934
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 860; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mechanical alloying; Amorphous; High-pressure; Alloy; Soft magnetic behavior

Citation Formats

Avar, Baris, Simsek, Tuncay, Ozcan, Sadan, Chattopadhyay, Arun K., and Kalkan, Bora. Structural stability of mechanically alloyed amorphous (FeCoNi)70Ti10B20 under high-temperature and high-pressure. United States: N. p., 2020. Web. doi:10.1016/j.jallcom.2020.158528.
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Avar, Baris, Simsek, Tuncay, Ozcan, Sadan, Chattopadhyay, Arun K., & Kalkan, Bora. Structural stability of mechanically alloyed amorphous (FeCoNi)70Ti10B20 under high-temperature and high-pressure. United States. https://doi.org/10.1016/j.jallcom.2020.158528
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Avar, Baris, Simsek, Tuncay, Ozcan, Sadan, Chattopadhyay, Arun K., and Kalkan, Bora. Tue . "Structural stability of mechanically alloyed amorphous (FeCoNi)70Ti10B20 under high-temperature and high-pressure". United States. https://doi.org/10.1016/j.jallcom.2020.158528. https://www.osti.gov/servlets/purl/1844934.
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@article{osti_1844934,
title = {Structural stability of mechanically alloyed amorphous (FeCoNi)70Ti10B20 under high-temperature and high-pressure},
author = {Avar, Baris and Simsek, Tuncay and Ozcan, Sadan and Chattopadhyay, Arun K. and Kalkan, Bora},
abstractNote = {Nanostructured (FeCoNi)70Ti10B20 (at%) alloy was synthesized by mechanical alloying from elemental powder mixture of Fe, Co, Ni, Ti and B using ball milling. The effect of ball milling time on the evolution of structure and morphology was investigated by X-ray diffraction, scanning and transmission electron microscopy and differential thermal analysis. It was observed that the formation of solid solution of (FeCoNi)70Ti10B20 started from the very onset of the milling process. Crystallite size and lattice strains seemed to be leveled off after 20 h of milling with no further major changes. The milling process for longer periods introduced severe plastic deformations causing formation of amorphous phase of (FeCoNi)70Ti10B20. The amorphous alloy composition was confirmed by energy dispersive X-ray spectroscopy analysis that showed an excellent homogeneity of the alloying elements. The phase stability of the mechanically alloyed amorphous sample was further verified by employing high-temperature and high-pressure studies. The alloy samples heat-treated at 700 °C revealed crystallization of the amorphous phase. However, synchrotron-based high-pressure ambient temperature X-ray diffraction studies confirmed that the amorphous phase of the alloy remained stable up to the pressure of 30 GPa. Here, the 50 h milled sample after being annealed at 350 °C showed improvement in the soft magnetic properties of the alloy, which was due to the probable elimination of the residual stress in the amorphous phase of the alloy powders.},
doi = {10.1016/j.jallcom.2020.158528},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 860,
place = {United States},
year = {Tue Dec 29 00:00:00 EST 2020},
month = {Tue Dec 29 00:00:00 EST 2020}
}
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https://doi.org/10.1016/j.jallcom.2020.158528
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