Structure evolution of soft magnetic (Fe36Co36B19.2Si4.8Nb4)100−Cu  (x= 0 and 0.5) bulk glassy alloys

Stoica, M.; Ramasamy, Parthiban; Kaban, I.; Scudino, Sergio; Nicoară, Mircea; Vaughan, Gavin; Wright, Jonathan P.; Kumar, Ravi; Eckert, J.

doi:10.1016/j.actamat.2015.05.042

Cited by 23 publications

(8 citation statements)

References 33 publications

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“…These results are in agreement with those recently presented in Ref. 32, which indicates a completely different crystallization behavior of MA compared to BA. In the case of BA, as can be seen also in Fig.…”

Section: Resultssupporting

confidence: 94%

Kinetic analysis of the non-isothermal crystallization process, magnetic and mechanical properties of FeCoBSiNb and FeCoBSiNbCu bulk metallic glasses

Ramasamy

Stoica

Taghvaei

et al. 2016

Journal of Applied Physics

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The crystallization kinetics of [(Fe 0.5 Co 0.5) 0.75 B 0.2 Si 0.05 ] 96 Nb 4 and {[(Fe 0.5 Co 0.5) 0.75 B 0.2 Si 0.05 ] 0.96 Nb 0.04 } 99.5 Cu 0.5 bulk metallic glasses were evaluated using differential scanning calorimetry under non-isothermal condition. The fully glassy rods with diameters up to 2 mm were obtained by copper mold injection casting. Both glasses show good thermal stability, but the addition of only 0.5% Cu completely changes the crystallization behavior. The average activation energy required for crystallization decreases from 645 kJ/mol to 425 kJ/mol after Cu addition. Upon heating, the Cu-free alloy forms only the metastable Fe 23 B 6 phase. In contrast, two well-separated exothermic events are observed for the Cu-added bulk glassy samples. First, the (Fe,Co) phase nucleates and then (Fe,Co) 2 B and/or (Fe,Co) 3 B crystallize from the remaining glassy matrix. The Cu-added alloy exhibits a lower coercivity and a higher magnetic saturation than the base alloy, both in as-cast as well as in annealed condition. Besides, the Cu-added glassy sample with 2 mm diameter exhibits a maximum compressive fracture strength of 3913 MPa together with a plastic strain of 0.6%, which is highest plastic strain ever reported for 2 mm diameter ferromagnetic bulk metallic glass sample. Although Cu addition improves the magnetic and mechanical properties of the glass, it affects the glass-forming ability of the base alloy.

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Section: Resultssupporting

confidence: 94%

Kinetic analysis of the non-isothermal crystallization process, magnetic and mechanical properties of FeCoBSiNb and FeCoBSiNbCu bulk metallic glasses

Ramasamy

Stoica

Taghvaei

et al. 2016

Journal of Applied Physics

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“…These differences in the crystallization behavior are associated with the different atomic arrangements in the two types of amorphous alloys. This hypothesis was confirmed by synchrotron studies [45,46]. For the {[(Fe 0.5 Co 0.5 ) 0.75 B 0.20 Si 0.05 ] 0.96 Nb 0 .…”

Section: Resultsmentioning

confidence: 55%

“…For the {[(Fe 0.5 Co 0.5 ) 0.75 B 0.20 Si 0.05 ] 0.96 Nb 0 . 04 } 100− x Cu x alloy prepared on the basis of pure metals and for the (Fe 36 Co 36 B 19,2 Si 4,8 Nb 4 ) 100− x Cu x and [(Fe,Co) 0,75 Si 0,05 B 0,20 ] 94 Nb 6 alloys prepared on the ferroalloys, the existence of the crystalline phases, such as (Fe,Co) 23 B 6 , (Fe,Co) 2 B, (Fe,Co) 3 B, and Nb 5 Si 3 was previously shown in the literature [4,5,46]. …”

Section: Resultsmentioning

confidence: 81%

“…For the (Fe 36 Co 36 B 19.2 Si 4.8 Nb 4 ) 100− x Cu x alloy, this sequence is different and can be summarized as follows: amorphous phase 1→ amorphous phase 2 plus (Fe,Co)→ residual amorphous phase (eventually) plus (Fe,Co) plus (Fe,Co,Nb) 23 B 6 → (Fe,Co) plus (Fe,Co,Nb) 23 B 6 plus (Fe,Co) 2 B [46]. These differences in the crystallization behavior are associated with the different atomic arrangements in the two types of amorphous alloys.…”

Section: Resultsmentioning

confidence: 99%

“…The alloy rods prepared on the basis of pure metals and non-metals have a lower coercive force [45,46,47] compared to the alloy rods prepared on the basis of ferroalloys, which is related to the reduced amount of impurities present in the alloy [2]. The use of high-purity charge materials makes it possible to obtain an increased critical casting thickness/diameter of BMGs [47,48].…”

Section: Resultsmentioning

confidence: 99%

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A Study of Structure and Magnetic Properties of Low Purity Fe-Co-Based Metallic Glasses

Lesz

2017

Materials

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This paper is related to the evaluation of the possibility of using ferroalloys for the production of conventional (CMGs) and bulk metallic glasses (BMGs) as well as determining their magnetic properties. The structure and magnetic properties of Fe-Co-based CMGs and BMGs prepared from ferroalloys and pure elements, were studied. The CMGs and BMGs were in the form of ribbons and rods, respectively. The thickness of the ribbons were 0.07, 0.12, and 0.27 mm and the diameters of the rods were 1.5 and 2.5 mm. The investigations of the structure of the test specimens were carried out using the X-ray diffraction (XRD) method and electron microscopy methods (HRTEM—high-resolution transmission electron microscope, SEM—scanning electron microscope). The relationship between the structure and magnetic properties of the Fe36.00Co36.00B19.00Si5Nb4 and Fe35.75Co35.75B18.90Si5Nb4Cu0.6 CMGs and BMGs was determined. The possibility of using new materials, i.e., CMGs and BMGs, prepared on the basis of ferroalloys, lies in the scope of the presently conducted research and allows us to obtain the utility properties, while avoiding high costs associated with the purchase of raw materials.

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Effect of Cu Presence on Evolution of Mechanical and Magnetic Properties in a Novel Fe-Based Bulk Metallic Glass During Partial Annealing Process

Hasani

Rezaei-Shahreza

Seifoddini

2018

Metall Mater Trans A

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Structure evolution of soft magnetic (Fe36Co36B19.2Si4.8Nb4)100−Cu (x= 0 and 0.5) bulk glassy alloys

Cited by 23 publications

References 33 publications

Kinetic analysis of the non-isothermal crystallization process, magnetic and mechanical properties of FeCoBSiNb and FeCoBSiNbCu bulk metallic glasses

Kinetic analysis of the non-isothermal crystallization process, magnetic and mechanical properties of FeCoBSiNb and FeCoBSiNbCu bulk metallic glasses

A Study of Structure and Magnetic Properties of Low Purity Fe-Co-Based Metallic Glasses

Effect of Cu Presence on Evolution of Mechanical and Magnetic Properties in a Novel Fe-Based Bulk Metallic Glass During Partial Annealing Process

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