Effects of chemical composition on nanocrystallization kinetics, microstructure and magnetic properties of finemet-type amorphous alloys

Shivaee, Hossein Asghari; Castellero, Alberto; Rizzi, Paola; Tiberto, P.; Hosseini, H.R. Madaah; Baricco, Marcello

doi:10.1007/s12540-013-4003-9

Cited by 16 publications

(8 citation statements)

References 52 publications

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“…In these composites, the tensile elongation is improved by forming deformation bands at dendrites and multiple shear bands in the amorphous matrix simultaneously. [17][18][19][20] According to Hofmann et al, [18] the tensile strength and elongation increased up to 1510 MPa and 9.5 pct, respectively, by increasing the volume fraction of b dendrites up to 47 pct in Zr-based amorphous matrix composites containing more Ti content (31 to 34 at. pct) than a Zr-based amorphous matrix composite containing ductile dendrites, i.e., an 'LM2' composite (commercial brand name of the Liquidmetal Technologies, Lake Forest, CA, USA, composition; Zr 56.2 Ti 13.8 Nb 5.0 Cu 6.9 Ni 5.6 Be 12.5 (at.…”

Section: Introductionmentioning

confidence: 99%

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Jeon

Lee

Kim

et al. 2014

Metall Mater Trans A

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Five composite sheets having different thicknesses were fabricated by varying cooling rates after a vacuum arc melting of a Ti-based amorphous matrix composite fabricated by adding alloying elements of Ti, Zr, V, Ni, Al, and Be into a Ti-6Al-4V alloy. These composite sheets contained 72 to 75 vol. pct of dendrites sized by 9 to 27 lm, and showed excellent tensile properties of yield strength of 1.3 GPa and elongation up to 6.5 pct. According to the observation of tensile deformation behavior of the 3-mm-thick composite sheet, many deformation bands were formed inside dendrites in several directions, and deformation bands met crossly each other to form widely deformed areas. Since the wide and homogeneous deformation in this sheet beneficially worked for the tensile strength and elongation simultaneously, the optimum effective dendrite size (12.1 lm) and sheet thickness (3 mm) were determined for the Ti-based amorphous matrix composite. The finite element method (FEM) analysis based on real microstructures was also conducted to theoretically explain the enhanced elongation in terms of effective dendrite size. The shape and location of deformation bands estimated from the FEM simulations were well matched with the experimental observations.

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Section: Introductionmentioning

confidence: 99%

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Jeon

Lee

Kim

et al. 2014

Metall Mater Trans A

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“…have been remarkably made by developing amorphous alloys with high glass-forming ability, [1][2][3][4][5][6][7] but there are problems to be solved, typical one of which is brittle fracture. [8,9] In order to overcome this brittle fracture, development activities on composite-type alloys by homogeneously distributing ductile crystalline dendrites in Zr-or Ti-based amorphous matrix have been actively performed.…”

Section: Recently Advances In Bulk Amorphous Alloysmentioning

confidence: 99%

Unique Appearance of Lamellar Cleavage Patterns on Fracture Surfaces of Ti-Based Amorphous Matrix Composite

Jeon

Suh

Kim

et al. 2015

Metall Mater Trans A

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In order to improve mechanical properties of Ti-based amorphous matrix composites basically composed of ductile b-Ti dendrites and brittle amorphous matrix by overcoming their inherent brittle nature, their fracture mechanisms should be verified in relation with microstructure, stress intensity factor level, and crack growth rate. In this study, thus, detailed fractographic observations including the unique appearance of lamellar cleavage patterns, which has not been reported in previous studies on conventional metals and alloys, were conducted. According to fractographic results, lamellar cleavage patterns were formed by repeated interruptions of crack propagation on {100} cleavage planes by difference between dendrite orientation and loading direction. Ductile-to-brittle transition phenomenon (ductile dimpled fracture fi lamellar cleavage fracture fi ordinary cleavage fracture in dendrite areas, and vein pattern fi smooth pattern in amorphous matrix areas) occurred with increasing crack growth rate was also plausibly explained by the concept of time required for crack growth as well as dendrite orientation.

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“…Under laboratory conditions, annealing is most often performed in vacuum or in an inert environment (e.g., in He, Ar, N 2 , H 2 , and others), whereas this is carried out in air in industrial production. To improve the soft magnetic properties, it was attempted to vary the concentration of elements in the Finemet alloy [8][9][10][11][12][13][14][15][16], to substitute them with other elements [17][18][19][20][21][22][23][24], to perform annealing of the initial quasi-amorphous alloy for various times [25] and at various temperatures [8], in a magnetic field or without it [26][27][28][29][30][31], as well as under a pressure [32] or a tensile load [33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature of Long Annealing on the Structure and Magnetic Properties of Nanocrystalline FeSiNbCuB Alloy

et al. 2021

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The dependence of soft magnetic properties of the Fe 73.5 Si 13.5 Nb 3 Cu 1 B 9 alloy on the 2-hour air annealing temperature T an at temperatures from 520 to 620°C is studied. It is shown that the magnetic hysteresis loop is significantly broadens and becomes more inclined, and the Curie temperature of the amorphous matrix surrounding α-FeSi nanocrystals decreases with increasing T an . The atomic structure and phase composition of alloy samples are studied by transmission X-ray diffraction. After annealing at temperatures to 580°C, nanocrystals contain mostly D0 3 phase (Fe 3 Si stoichiometry) and are ~7 nm in average size. Their relative fraction in the alloy increases with temperature due to additional iron diffusion from the matrix to nanocrystals. After annealings at T an > 600°C, the average nanocrystal size increases, and iron boride crystal reflections appear in X-ray diffraction patterns. Degradation of soft magnetic properties of nanocrystalline Fe 73.5 Si 13.5 Nb 3 Cu 1 B 9 alloy with annealing temperature from 520 to 580°C is explained by a decrease in the silicon concentration in FeSi nanocrystals, which results in an increase in the magnetocrystalline anisotropy.

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Effects of chemical composition on nanocrystallization kinetics, microstructure and magnetic properties of finemet-type amorphous alloys

Cited by 16 publications

References 52 publications

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Unique Appearance of Lamellar Cleavage Patterns on Fracture Surfaces of Ti-Based Amorphous Matrix Composite

Effect of Temperature of Long Annealing on the Structure and Magnetic Properties of Nanocrystalline FeSiNbCuB Alloy

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