Order controlled dislocations and grain boundary mobility in Fe–Al–Cr alloys

Lambri, O.A.; Pérez-Landazábal, J.I.; Recarte, V.; Cuello, G.J.; Golovin, I.S.

doi:10.1016/j.jallcom.2012.04.119

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…As expected, the amount of silicon influences dislocation mobility through two main contributions, the increase in Peierls Nabarro force and the ordering, which raises stacking fault energy [73] . The influence of ordering in stacking fault energy has been studied in other ordered alloys [74] . Decreasing overall ordering would increase dislocation mobility.…”

Section: Positron Annihilation and Ebsd Deformation Recovery And Rementioning

confidence: 99%

A review of ordering phenomena in iron-silicon alloys

Villafañe¹,

Houbaert²

2013

REVMETAL

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Silicon steel is an industrially-desired alloy of iron and silicon, characterised by soft magnetic properties, low eddy-current losses, and low magnetostriction. Silicon steels have narrow hysteresis cycles, making them particularly advantageous in applications using electromagnetic fields, such as transformers, generators, electric motor cores, and few other components in industry. Despite its incontestable industrial value, there is not much agreement on the atomic structure of silicon steel. Gaining better understanding of e.g. ordering processes in Fe-Si alloys could not only explain their magnetic properties, but also open opportunities to reduce their weaker characteristics, such as brittleness that adversely affects silicon steel workability and its associated high production costs. This review summarises the state-of-the-art knowledge about ordering in silicon steel and describes the most relevant experimental techniques used for studying its microstructure. In addition, the process of building the iron rich part of the Fe-Si phase diagram is explained. Lastly, the influence of order on the alloy's magnetic and mechanical properties is illustrated. KeywordsOrdering; Iron-silicon alloys; Intermetallic phases; Mechanical properties; Phase diagram. Revisión de fenómenos de orden en aleaciones hierro-silicio ResumenEl acero al silicio es una aleación de importancia industrial, caracterizada por propiedades magnéticas blandas, bajas pérdidas por corrientes de Foucault y baja magnetostricción. Los aceros al silicio tienen ciclo de histéresis estrecho, lo que es una ventaja en aplicaciones con campos electromagnéticos, como transformadores, generadores, núcleos de motores eléctricos y otros componentes industriales. A pesar de su incomparable valor industrial, no hay convenio sobre la estructura atómica del acero al silicio. Obtener mayor conocimiento sobre los procesos de orden no sólo podría explicar las propiedades magnéticas sino que también podría abrir vías para la reducción de sus características más débiles, como su fragilidad, la cual afecta negativamente a la fabricación del acero al silicio y se asocia con altos costes de producción. Esta revisión resume los últimos conocimientos sobre orden en acero al silicio y describe las técnicas experimentales más importantes usadas para estudiar su estructura. Además, se da una explicación sobre la construcción de la parte rica en hierro del diagrama de fases del Fe-Si. Por último se ilustra la influencia del orden en las propiedades magnéticas y mecánicas. Palabras claveOrden; Aleaciones hierro-silicio; Fases intermetálicas; Propiedades mecánicas; Diagrama de fases.

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Section: Positron Annihilation and Ebsd Deformation Recovery And Rementioning

confidence: 99%

A review of ordering phenomena in iron-silicon alloys

Villafañe¹,

Houbaert²

2013

REVMETAL

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“…However, the microsturcture of martensite and twins could be changed by the external stress applied on the alloys, resulting in a variation of the mobility of twin and martensite boundaries and thus change the damping capacity of the alloy. Besides, the crystal defects and internal stress field can also be the reasons for damping capacity change, as reported in Fe‐Cr based damping alloys . The crystal defects and internal stress field could be introduced by cold pre‐deformation.…”

Section: Introductionmentioning

confidence: 88%

Effect of Pre‐Deformation and Subsequent Aging on the Damping Capacity of Mn‐20 at.%Cu‐5 at.%Ni‐2 at.%Fe alloy

Jin

et al. 2015

Adv Eng Mater

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In the paper, the effect of pre-deformation and subsequent aging treatment on the damping capacity and microstructure of Mn-20 at.%Cu-5 at.%Ni-2 at.%Fe (M2052) alloy is investigated. The logarithmic decrement (d) of the specimens with various pre-deformation degrees is determined to discuss the change of damping capacity before and after aging process. Meanwhile, the martensite and twinning structures with different deformation degree are comparatively studied. The results suggest that the d of the alloy decreases rapidly and the martensite plates are rearranged and become thinner with increase in deformation degree. Reasons accounting for the decrease are discussed and attributed to the internal stress field introduced during the deformation process which hinders the motion of the twin and phase boundaries. In addition, aging at 435°C for 20 min leads to a recovery of the damping capacity of the pre-deformed M2052 alloy. However, the recovery is highly dependent on the pre-deformation degree. The damping capacity of the specimens with a deformation less than 5% can be completely recovered after aging, while the others with a deformation exceeds 5% can be just partly recovered.

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“…In contrast, when the order decreases or disappears after annealing, the dislocation and grain boundary mobility increases which results in an increase in damping as compared with the ordered state. 2) In alloys and lightly coldworked metals, the damping measured at increasing amplitudes is at first a constant, then increases sharply above amplitudes of around 10 ¹6 . 4,5) This behaviour has been explained by Granato and Lücke as due to the breaking away of dislocations loops from pinning impurities.…”

Section: Introductionmentioning

confidence: 99%

“…The degree of order and the defect configuration both influence the mobility of dislocations and grain boundaries in Fe25 at%(Al + Si), Fe15 at%(Al + Si), 1) Fe-25 at%Al-8 at%Cr, Fe-25 at%Al-25 at%Cr 2) and in Fe10 at%Si. 3) In FeAlSi and Fe-Al-Cr alloys a decrease in the order degree after heating up to 1200 K and 1050 K, respectively leads to the appearance or enhancement of a damping peak at around 1000 K during the subsequent cooling measurement.…”

Section: Introductionmentioning

confidence: 99%

“…1) On the other side, for Fe-Al-Cr alloys the intensity of the peak recorded during the cooling is around three times larger than the value measured during heating, this peak being related to the solute grain boundary relaxation of the aluminium and chromium. 2) In binary FeSi alloys a higher degree of order (B2) accompanied by a grain boundary blocking leaded to a smaller peak height of the grain boundary solvent peak which appears at around 800 K.…”

Section: Introductionmentioning

confidence: 99%

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Order Evolution in Iron-Based Alloys Viewed through Amplitude Dependent Damping Studies

et al. 2015

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Amplitude dependent damping and neutron thermo-diffraction studies were performed in Fe-Al-Si, Fe-Al-Cr and Fe-Si alloys. Results show that the behaviour of the strength of the amplitude dependent damping as a function of temperature is a suitable tool for determining the order changes as a function of temperature. A decrease in the order degree leads to an increase in the strength of the amplitude dependent damping, due to the dislocation mobility increases.

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Order controlled dislocations and grain boundary mobility in Fe–Al–Cr alloys

Cited by 15 publications

References 30 publications

A review of ordering phenomena in iron-silicon alloys

A review of ordering phenomena in iron-silicon alloys

Effect of Pre‐Deformation and Subsequent Aging on the Damping Capacity of Mn‐20 at.%Cu‐5 at.%Ni‐2 at.%Fe alloy

Order Evolution in Iron-Based Alloys Viewed through Amplitude Dependent Damping Studies

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