The effect of iron addition on the microstructure, mechanical and magnetic properties of Al-matrix composite was studied. Mechanical mixing was used for the preparation of 0, 5%, 10% and 15% Fe-Al composites（mass fra...The effect of iron addition on the microstructure, mechanical and magnetic properties of Al-matrix composite was studied. Mechanical mixing was used for the preparation of 0, 5%, 10% and 15% Fe-Al composites（mass fraction）. Mixtures of Al-Fe were compacted and sintered in a vacuum furnace at 600 °C for 1 h. X-ray diffraction（XRD） of the samples containing 5% and 10% Fe indicates the presence of Al and Fe peaks, while sample containing 15% Fe reveals Al and Al13Fe4 peaks. The results show that both densification and thermal conductivity of the composites decrease by increasing the iron content. The presence of iron in the composite improves the compressive strength and the hardness. The strengthening mechanism is associated with the grain refinement of the matrix and uniform distribution of the Fe particles, as well as the formation of Al13Fe4 intermetallic. The measured magnetization values are equal to 0.3816×10-3 A·m2/g for 5% Fe sample and increases up to 0.6597×10-3 A·m2/g for 10% Fe sample, then decreases to 0.0702×10-3 A·m2/g for 15% Fe sample. This can be explained by the formation of the diamagnetic Al13Fe4 intermetallic compound in the higher Fe content sample detected by XRD analysis.展开更多
(Fe_(73)Ga_(27−x)Al_(x))_(99.8)Tb_(0.2)(x=0,1,2,3,4,5)alloys were prepared by vacuum arc furnace to investigate the effect of Al addition on the microstructure,magnetic properties,and mechanical properties of alloys.R...(Fe_(73)Ga_(27−x)Al_(x))_(99.8)Tb_(0.2)(x=0,1,2,3,4,5)alloys were prepared by vacuum arc furnace to investigate the effect of Al addition on the microstructure,magnetic properties,and mechanical properties of alloys.Results show that the phase structure of the alloys is still A2 phase and Tb_(2)Fe_(17) phase,and the metallographic structure is composed of cellular crystal and columnar dendrite.The decrease in lattice constant,the intensification of(100)orientation,and the generation of Tb_(2)Fe_(17) phase at the grain boundary exert significant effect on the magnetostrictive properties.The fracture morphology of the alloys is intergranular brittle fracture and cleavage fracture,and the causes of fracture occurrence include the segregation of Tb and Al elements.The parallel magnetostrictive strain(λ_(∥))of(Fe_(73)Ga_(24)Al_(3))_(99.8)Tb_(0.2)alloy peaks at 1.04×10^(−4).It is worth noting that compared with those of(Fe_(73)Ga_(27))_(99.8)Tb_(0.2)alloy,theλ_(∥)and elongation of(Fe_(73)Ga_(26)Al_(1))_(99.8)Tb_(0.2)alloy increase by 18.3%and 53.4%,respectively.Besides,(Fe_(73)Ga_(26)Al_(1))_(99.8)Tb_(0.2)alloy possesses the characteristics of high saturation magnetization(Ms),low remanent magnetization(M_(r)),and coercivity(H_(c)),which is beneficial to reduce the cost in actual production,but its tensile strength and Vickers hardness decrease to a certain extent.Therefore,the investigation on the micro-mechanism of Al addition on Fe-Ga alloys is of great significance for the development of Fe-Ga alloy devices.展开更多
文摘The effect of iron addition on the microstructure, mechanical and magnetic properties of Al-matrix composite was studied. Mechanical mixing was used for the preparation of 0, 5%, 10% and 15% Fe-Al composites（mass fraction）. Mixtures of Al-Fe were compacted and sintered in a vacuum furnace at 600 °C for 1 h. X-ray diffraction（XRD） of the samples containing 5% and 10% Fe indicates the presence of Al and Fe peaks, while sample containing 15% Fe reveals Al and Al13Fe4 peaks. The results show that both densification and thermal conductivity of the composites decrease by increasing the iron content. The presence of iron in the composite improves the compressive strength and the hardness. The strengthening mechanism is associated with the grain refinement of the matrix and uniform distribution of the Fe particles, as well as the formation of Al13Fe4 intermetallic. The measured magnetization values are equal to 0.3816×10-3 A·m2/g for 5% Fe sample and increases up to 0.6597×10-3 A·m2/g for 10% Fe sample, then decreases to 0.0702×10-3 A·m2/g for 15% Fe sample. This can be explained by the formation of the diamagnetic Al13Fe4 intermetallic compound in the higher Fe content sample detected by XRD analysis.
基金Inner Mongolia Autonomous Region Science and Technology Plan Project(2020GG0284)。
文摘(Fe_(73)Ga_(27−x)Al_(x))_(99.8)Tb_(0.2)(x=0,1,2,3,4,5)alloys were prepared by vacuum arc furnace to investigate the effect of Al addition on the microstructure,magnetic properties,and mechanical properties of alloys.Results show that the phase structure of the alloys is still A2 phase and Tb_(2)Fe_(17) phase,and the metallographic structure is composed of cellular crystal and columnar dendrite.The decrease in lattice constant,the intensification of(100)orientation,and the generation of Tb_(2)Fe_(17) phase at the grain boundary exert significant effect on the magnetostrictive properties.The fracture morphology of the alloys is intergranular brittle fracture and cleavage fracture,and the causes of fracture occurrence include the segregation of Tb and Al elements.The parallel magnetostrictive strain(λ_(∥))of(Fe_(73)Ga_(24)Al_(3))_(99.8)Tb_(0.2)alloy peaks at 1.04×10^(−4).It is worth noting that compared with those of(Fe_(73)Ga_(27))_(99.8)Tb_(0.2)alloy,theλ_(∥)and elongation of(Fe_(73)Ga_(26)Al_(1))_(99.8)Tb_(0.2)alloy increase by 18.3%and 53.4%,respectively.Besides,(Fe_(73)Ga_(26)Al_(1))_(99.8)Tb_(0.2)alloy possesses the characteristics of high saturation magnetization(Ms),low remanent magnetization(M_(r)),and coercivity(H_(c)),which is beneficial to reduce the cost in actual production,but its tensile strength and Vickers hardness decrease to a certain extent.Therefore,the investigation on the micro-mechanism of Al addition on Fe-Ga alloys is of great significance for the development of Fe-Ga alloy devices.
