Atomic-scale insights into ω-variants in Galfenol triggered by displacive-diffusive transformation

Guan, Chaoshuai; Chen, Bin; Jiang, Liping; Karim, Abdul; Jia, Lei; Hu, Yang; Liang, Yuping; Deng, Xia; Zhang, Junwei; Liu, Zhu; Bi, Kaiqi; Liu, Hongli; Zhang, Hong; Si, Mingsu; Peng, Yong

doi:10.1016/j.matdes.2021.109745

Cited by 10 publications

(1 citation statement)

References 41 publications

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“…According to the standard diffraction pattern of bcc iron, disorder A2 phase structure was noted for both the gas-atomized powders and S2 through the observation of three peaks indexed to (110), (200), and (211) planes, suggesting no crystal structure changes before and after LPBF process. It should be pointed out that there was probably an overlap of A2 and D0 3 phase structures in XRD diffraction peaks due to the similar crystal structures of the two phases and similar scattering factors of Fe atoms and Ga atoms, and tiny amounts of D0 3 phase structure might be annihilated in the background of A2 phase structure [8,[52][53][54]. To sum up, the Fe 81 Ga 19 pre-alloyed powders with A2 disorder A2 phase structure were prepared by gas atomization, moreover, metastable A2 phase structure was still maintained in the LPBFed bulk alloys.…”

Section: Resultsmentioning

confidence: 99%

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Yao,

Deng,

Wang

et al. 2024

Phys. Scr.

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Magnetostrictive Fe-Ga alloys, featuring with good machinability, high Curie temperature, and high permeability, have received increasing attention in fields such as actuators, implants, and energy harvesting. Unfortunately, bulk polycrystalline Fe-Ga alloys usually suffer poor magnetostrictive strains compromised by the randomness of grain structure and the intricate phase constitution. The current study was centered on the fabrication of bulk polycrystalline Fe81Ga19 alloys with tailored grain morphology and phase arrangement utilizing laser-beam powder bed fusion (LPBF) technology. Particular emphasis was laid on investigating the repercussions of LPBF process parameters on the microstructure and magnetostrictive performance. The findings illustrated a non-linear interplay between laser power and the relative density of laser powder bed fusion-fabricated (LPBFed) Fe81Ga19 alloys, marked by an initial augmentation followed by a subsequent decrement. Similarly, a consistent trend was observed for the LPBFed alloys at varying scan speeds. In particular, the LPBFed Fe81Ga19 alloys exhibited a highest density at optimized process parameters (laser power set at 120 W paired with a scan speed of 100 mm/s) due to suitable laser energy input during LPBF process. It was experimentally shown that elongated columnar grains and disorder A2 phase structures were obtained within the alloys attibutes to the high temperature gradient and rapid cooling kinetics intrinsic to LPBF, contributing to a desirable magnetostrictive strain of ~87 ppm for bulk polycrystalline Fe81Ga19 alloys. Moreover, a good dynamic magnetostrictive response of the LPBFed alloys was confirmed by the near-synchronous variations between magnetostrictive behavior and alternating magnetic fields. It can be derived from these findings that LPBF process may be a promising method to prepare bulk magnetostrictive Fe-Ga alloys for versatile applications.

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Section: Resultsmentioning

confidence: 99%

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Yao,

Deng,

Wang

et al. 2024

Phys. Scr.

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Mechanochemical Synthesis of PZT Powders and the Effects of Mechanical Activation on Solid-State Sintering Kinetics

Mehta

Sasikumar²

2022

Trans Indian Inst Met

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Local Displacive Phase Transformation in Large-Magnetostriction Alloy Fe81Ga19

Zhang

Gou

Yang

et al. 2023

Shap. Mem. Superelasticity

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Atomic-scale insights into ω-variants in Galfenol triggered by displacive-diffusive transformation

Cited by 10 publications

References 41 publications

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Mechanochemical Synthesis of PZT Powders and the Effects of Mechanical Activation on Solid-State Sintering Kinetics

Local Displacive Phase Transformation in Large-Magnetostriction Alloy Fe81Ga19

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Atomic-scale insights into ω-variants in Galfenol triggered by displacive-diffusive transformation

Cited by 10 publications

References 41 publications

Laser-beam powder bed fusion of magnetostrictive Fe81Ga19 alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Laser-beam powder bed fusion of magnetostrictive Fe81Ga19 alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Mechanochemical Synthesis of PZT Powders and the Effects of Mechanical Activation on Solid-State Sintering Kinetics

Local Displacive Phase Transformation in Large-Magnetostriction Alloy Fe81Ga19

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Product

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Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties