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Microstructure of polycrystalline Fe_(82)Ga_(18) sample with solidification texture

Rare Metals 2016年第9期35卷 686-690页

作者： aliakbar emdadi Center for Advanced Materials Research Faculty of Materials EngineeringSahand University of Technology

Main attention of this paper was devoted to studying the effect of solidification texture on microstructure（phase constituents,grain morphology,and magnetic domain structure） of polycrystalline Fe_（82）Ga_（18） *** alloy was melted using button arc melting and solidified in water-cooled copper *** microscope（OM） results confirm the development of large columnar grains in the solidification *** constitution and magnetic domain structures of the sample were studied by X-ray diffraction（XRD） and magnetic force microscopy（MFM）.Results show a single-phase solid solution with an A2 structure for the sample which consists of regularly aligned magnetic *** some maze-like subdomains are found in few regions,well-aligned stripe-like domains are predominant patterns in the *** demonstrates the high dependence of grain morphology and magnetic domain structure upon a preferred crystallographic direction during solidification.

关键词： Galfenol Solidification texture Grain morphology Magnetic domain structure

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维普期刊数据库

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Microstructure and magnetostrictive behavior of Fe-15 at% Ga alloy with different cooling rates

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Rare Metals 2015年第4期34卷 251-254页

作者： aliakbar emdadi Faculty of Materials Engineering Center for Advanced Materials Research Sahand University of Technology

The main attention of this paper was devoted to the study of the effect of different cooling rates on the magnetic domain configuration and magnetostrictive behavior of heat-treated Fe-15 at% Ga alloy. After annealing at 1,000℃ for 3 h, the samples were subjected to water quenching, air cooling, and furnace cooling treatments. Phase constitution and magnetic domain structures of the samples were studied using X-ray diffraction （XRD） and magnetic force microscopy （MFM）. XRD results indicate a single phase of α-Fe with disordered bcc （A2） structure for all samples. MFM results show that both water-quenched （WQ） and air-cooled （AC） samples are mainly made from ordered stripe domain structures, whereas a mixture of irregular stripe, zigzag, and plate domain patterns are observed in furnace-cooled （FC） sample. Magnetostrictive strain was measured in the presence of an extemally applied magnetic field. It is found that WQ sample has the highest magnetostriction, while AC and FC samples exhibit moderate and the lowest magnetostriction, respectively, against the applied field. The dependence of initial domain configurations on thermal history is found to be conducive to the change in saturation magnetostrictions of the samples.

关键词： Fe-Ga alloy Magnetostrictive behavior Micro-stress X-ray diffraction Magnetic domain structure

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维普期刊数据库

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Microstructural dependence of magnetic and magnetostrictive properties in Fe-19 at% Ga

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Rare Metals 2020年第4期39卷 413-420页

作者： aliakbar emdadi Syamak Hossein Nedjad Habib Badri Ghavifekr Majid Kavanlouei Faezeh Alijan Farzad Lahiji Vahid Ramezankhani National University of Science and Technology‘MISiS' Moscow 119049Russia Faculty of Materials Engineering Sahand University of TechnologyTabriz 51335-1996Iran Faculty of Electrical Engineering Sahand University of TechnologyTabriz 51335-1996Iran Department of Materials Engineering Faculty of EngineeringUrmia UniversityUrmia 165Iran

A combination study of magnetic and magnetostrictive properties in directionally cast(DC)(un-annealed)and differently heat-treated Fe-19 at%Ga samples was carried out at room *** cooling leads to an increase in the occupation of[200]easy magnetic ***,structural ordering of Ga atoms into a metastable D03 phase decreases the saturation magnetostriction(λs)and saturation magnetization(Ms),while increases coercivity(Hc).Water quenching suppresses the formation of stable fee ordered phase(L12)and largely preserves disordered bcc single-phase(A2)structure down to room temperature,leading to enhanced magnetostriction and *** cooling promotes the ordering of metastable bcc ordered phase(D03).Magnetic force microscopy(MFM)study exhibits that the water-quenched(WQ)sample consists of a well-aligned stripe domain structure,while irregular maze-like domain structure is observed in furnace-cooled(FC)*** results confirm that in addition to an inhibitory effect of D03 ordering on magnetic domain wall motions,irregular magnetic domains also contribute to decrease in magnetic and magnetostrictive properties of FC sample.

关键词： Fe-Ga alloy Magnetostrictive behavior Structural ordering Magnetic properties

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维普期刊数据库

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