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PHASE TRANSITION AND PLASTICITY ENHANCEMENT OF Ti-Cu-BASED BULK METALLIC GLASSES

L. Wang G. Zhang X. Sun X. Wang
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 1 | DOI: 10.24425/118952
Keywords Bulk metallic glasses Phase transition Annealing stability Plasticity
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Authors and Affiliations

L. Wang
G. Zhang
X. Sun
X. Wang

Effect of Cooling Rate on Mechanical Properties of new Multicomponent Fe-Based Amorphous Alloy During Annealing Process

P. Rezaei-Shahreza H. Redaei P. Moosavi S. Hasani A. Seifoddini B. Jeż M. Nabiałek
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 1 | 251-254 | DOI: 10.24425/amm.2022.137498
Keywords Bulk metallic glasses (BMGs) Nanocomposite Mechanical testing Fracture toughness
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Abstract

Fe-based bulk metallic glasses (BMGs) have been extensively investigated due to their ultrahigh strength and elastic moduli as well as desire magnetic properties. However, these BMGs have few applications in industrial productions because of their brittleness at room temperature. This study is focused on the effect of cooling rate on the mechanical properties (especially toughness) in the Fe41Co7Cr15Mo14Y2C15B6 BMG. For this aim, two samples with the mentioned composition were fabricated in a water-cooled copper mold with a diameter of 2 mm, and in a graphite mold with a diameter of 3 mm. The formation of crystalline phases of Fe23(B, C)6, α-Fe and Mo3Co3C based on XRD patterns was observed after the partial crystallization process. To determine the toughness of the as-cast and annealed samples, the indentation technique was used. These results revealed that the maximum hardness and toughness were depicted in the sample casted in the water-cooled copper mold and annealed up to 928°C. The reason of it can be attributed to the formation of crystalline clusters in the amorphous matrix of the samples casted in the graphite mold, so that this decrease in the cooling rate causes to changing the chemical composition of the amorphous matrix.
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Authors and Affiliations

P. Rezaei-Shahreza
1
ORCID: ORCID
H. Redaei
1
ORCID: ORCID
P. Moosavi
1
ORCID: ORCID
S. Hasani
1
A. Seifoddini
1
ORCID: ORCID
B. Jeż
2
ORCID: ORCID
M. Nabiałek
2
ORCID: ORCID
  1. Yazd University, Department of Mining and Metallurgical Engineering, 89195-741, Yazd, Iran
  2. Częstochowa University of Technology, Faculty of Production Engineering and Materials Technology, Department of Physics, 19 Armii Krajowej Av., 42-200 Częstochowa, Poland

Structure and properties of suction-cast Pr-(Fe, Co)-(Zr, Nb)-B rod magnets

Katarzyna Pawlik
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 5 | e138971 | DOI: 10.24425/bpasts.2021.138971
Keywords bulk metallic glasses bulk nanostructured magnets RE-Fe-B magnets miniature magnets
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Abstract

The rod specimens were produced from Pr9Fe50 + xCo13Zr1Nb4B23 – x (x = 0, 5, 8) alloys using the suction-casting technique. Subsequent devitrification annealing of those samples resulted in the change of their phase structure and magnetic properties. For annealed specimens of all investigated compositions, the Rietveld analyses of X-ray diffractions have shown the presence of three crystalline phases: the hard magnetic Pr2Fe11.2Co2.8B, soft magnetic α-Fe, and paramagnetic Pr1 + xFe4B4, which have precipitated within the amorphous matrix. This technique allowed us to determine the weight fractions of constituent phases. Furthermore, the microstructural changes with the alloy composition were observed. Magnetic measurements of annealed rods allowed us to calculate the switching field distributions (SFD) and δM plots in order to determine the strength and character of magnetic interactions between grains of constituent phases.
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Authors and Affiliations

Katarzyna Pawlik
1
  1. Department of Physics, Faculty of Production Engineering and Materials Technology, Częstochowa University of Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland

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