Particle pinning force thresholds for promoting abnormal grain growth in magnetostrictive Fe–Ga alloy sheets

Na, Suok-Min; Atwater, Katherine; Flatau, Alison B.

doi:10.1016/j.scriptamat.2014.11.027

Cited by 30 publications

(14 citation statements)

References 20 publications

(23 reference statements)

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“…However, the value of n of the Ti–22Al–25Nb alloy is below 0.5, in the present work. There are several factors, e.g., the dislocation sub‐structure, the free surface, the second‐phase particles and the crystallographic texture, could reduce the value of n . In the present work, no obvious texture is observed in initial Ti–22Al–25Nb alloy.…”

Section: Resultsmentioning

confidence: 46%

“…This will result in discontinuous grain growth and the formation of non‐homogeneous microstructures. AGG is particularly observed, when NGG is inhibited by some obstacles, e.g., voids and second‐phase particles . As mentioned above, the α 2 particles that pin the grain boundary cause a local grain boundary discontinuity and, thus, prohibit the grain boundary motion (Figure f).…”

Section: Resultsmentioning

confidence: 82%

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Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Kou

Tang

et al. 2017

Adv Eng Mater

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The effects of solution treatment on the microstructure and mechanical properties of Ti-22Al-25Nb alloy are investigated. Numerous equiaxed a 2 particles distribute in a B2 matrix after solution treatment in the a 2 þ B2 region. The growth rate of the B2 grain increases with solution temperature and decreases with increasing holding time. When the solution temperature is lower than B2-transus, it is seen that both the strength and ductility decrease with increasing solution temperature and holding time. After being solution-treated at a super-transus temperature, the alloy with a fully B2 microstructure shows an ultralow elongation ($5%) and a typical brittle fracture characteristic.

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Section: Resultsmentioning

confidence: 46%

Section: Resultsmentioning

confidence: 82%

Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Kou

Tang

et al. 2017

Adv Eng Mater

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“…While {112}-{111}<110> is the stronger texture at subsurface layer, {111}<112> and {113}<361> are the orientation density peaks at central layer. This primary recrystallization texture is different from the usual observation in grain-oriented silicon steels and Fe-Ga sheets, with strong {111}<112> and weak Goss at the subsurface layer [17][18][19]24,25]. Figure 2 illustrates the microstructure and texture of warm rolled sheets.…”

Section: Methodsmentioning

confidence: 79%

“…Micron-sized particles of NbC are added in an Fe-Ga alloy sheet to suppress the growth of primary grains, and on this basis, the abnormal grain growth (AGG) of Goss grains is achieved by the surface energy effect from sulfur alloying or H 2 S atmosphere. Na et al [16,17] reported that nearly single-crystal Goss grains with magnetostriction coefficient of 300 ppm were developed in Fe 81 Ga 19 sheets by combining 1-2.5 mol.% NbC micron particles with an H 2 S + Ar atmosphere. Yuan and Liu et al [18][19][20] obtained centimeters-sized Goss grains with a magnetostriction coefficient of 245 ppm at annealing atmosphere containing the sulfur element in Fe-Ga-based sheet added 0.1 mol.% NbC.…”

Section: Introductionmentioning

confidence: 99%

Secondary Recrystallization Goss Texture Development in a Binary Fe81Ga19 Sheet Induced by Inherent Grain Boundary Mobility

Sha

Shan

et al. 2019

Metals

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Secondary recrystallization Goss texture was efficiently achieved in rolled, binary Fe81Ga19 alloy sheets without the traditional dependence on inhibitors and the surface energy effect. The development of abnormal grain growth (AGG) of Goss grains was analyzed by quasi-situ electron backscatter diffraction (EBSD). The special primary recrystallization texture with strong {112}–{111}<110> and weak Goss texture provides the inherent pinning effect for normal grain growth by a large number of low angle grain boundaries (<15°) and very high angle grain boundaries (>45°) according to the calculation of misorientation angle distribution. The evolution of grain orientation and grain boundary characteristic indicates that the higher fraction of high energy grain boundaries (20–45°) around primary Goss grains supplies a relative advantage in grain boundary mobility from 950 °C to 1000 °C. The secondary recrystallization in binary Fe81Ga19 alloy is realized in terms of the controllable grain boundary mobility difference between Goss and matrix grains, coupled with the orientation and misorientation angle distribution of adjacent matrix grains.

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“…Trace doping with rare earth elements has been confirmed to be the most effective way to influence the induced tetragonality of the matrix and it greatly enhances the magnetostriction of the Fe-Ga alloys11. Secondly, a body of work has been performed to optimize the mechanical properties of Fe-Ga through addition of the third elements such as B, C, Al, V, Cr, Mo, Mn and Nb13161718223031, or refractory carbide precipitates such as X–C (X = Zr, Nb, Ta, Mo)3233343536. As a result, effective improvements of mechanical properties have been obtained by means of the alloy additions or the formation of carbide precipitates, but there is no significant improvement of the magnetostriction.…”

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confidence: 99%

Investigating enhanced mechanical properties in dual-phase Fe-Ga-Tb alloys

Meng

Wang

et al. 2016

Sci Rep

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Dual-phase (Fe83Ga17)100−xTbx alloys with 0 ≤ x ≤ 1 were synthesized by arc melting and homogenization treatment. The microstructures and the corresponding mechanical properties were systematically investigated. The chemical composition of the body centered cubic matrix is Fe83Ga17. The monoclinic second phase was composed of meltable precipitates with approximate composition Fe57Ga33Tb10. The nano-hardness of matrix and precipitates were 2.55 ± 0.17 GPa and 6.81 ± 1.03 GPa, respectively. Both the ultimate tensile strength (UTS) and fracture strain (ε) of the alloys were improved by the precipitates for x ≤ 0.2 alloys, but the strain decreases significantly at higher values of x. As potential structural-functional materials, the best mechanical properties obtained were a UTS of 595 ± 10 MPa and an ε of 3.5 ± 0.1%, four-fold and seven-fold improvements compared with the un-doped alloy. The mechanism for these anomalous changes of mechanical properties was attributed to the dispersed precipitates and semi-coherent interfaces, which serve as strong obstacles to dislocation motion and reduce the stress concentration at the grain boundaries. A sizeable improvement of magnetostriction induced by the precipitates in the range 0 ≤ x ≤ 0.2 was discovered and an optimal value of 150 ± 5 ppm is found, over three times higher than that of the un-doped alloy.

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Particle pinning force thresholds for promoting abnormal grain growth in magnetostrictive Fe–Ga alloy sheets

Cited by 30 publications

References 20 publications

Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Secondary Recrystallization Goss Texture Development in a Binary Fe81Ga19 Sheet Induced by Inherent Grain Boundary Mobility

Investigating enhanced mechanical properties in dual-phase Fe-Ga-Tb alloys

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