To investigate the influence of the addition of Pr-Ga alloys on magnetic properties and morphology of materials,the hot-deformed PrNd-Fe-B magnets were prepared by the addition of Pr-Ga alloys using a dual-alloys diff...To investigate the influence of the addition of Pr-Ga alloys on magnetic properties and morphology of materials,the hot-deformed PrNd-Fe-B magnets were prepared by the addition of Pr-Ga alloys using a dual-alloys diffusion.The room-temperature coercivity of the hot-deformed PrNd-Fe-B magnets increases substantially from 1.68 to 2.34 T,while the remanence decreases from 1.42 to 1.24 T,by the addition of 5 wt%Pr-Ga alloys.Moreover,the thermal stability of coercivity improves from-0.46%/℃to-0.42%/℃.Two types of grain boundary phases(PrNd-rich and PrNd-Ga-rich)are generated at grain boundaries by microstructural analysis,resulting in the decrease of Fe element concentration from more than 60%to about 10%at grain boundaries.The decrease of ferromagnetic element concentration at grain boundaries and the refinement of grain are considered to be the main reasons for the improvement of coercivity and thermal stability.展开更多
The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of g...The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of good combination of strength and toughness: (2)good damping ca- pacity(Q^(-1)≥5.0×10^(-3))can be obtained in dual-phase alloys only when the volume fraction of tempered martensite was controlled properly.The effect of martensite on magnetomechanical damp- ing of the ferritic matrix was analysed.The damping capacity of dual-phase alloys was related to the volume fraction V_m of tempered martensite by Q_^(-1)=Q_^(-1) (1-V_m/1+BV_m)at small vibration strain amplitudes ε_A≤5.0×10^(-6).展开更多
基金Project supported by the Ningbo Science and Technology Major Project(Gr2017B10002,2019B10093)the National Natural Science Foundation of China(51671207)the Zhejiang Province Technology Application Research Project(LGG19E010001)。
文摘To investigate the influence of the addition of Pr-Ga alloys on magnetic properties and morphology of materials,the hot-deformed PrNd-Fe-B magnets were prepared by the addition of Pr-Ga alloys using a dual-alloys diffusion.The room-temperature coercivity of the hot-deformed PrNd-Fe-B magnets increases substantially from 1.68 to 2.34 T,while the remanence decreases from 1.42 to 1.24 T,by the addition of 5 wt%Pr-Ga alloys.Moreover,the thermal stability of coercivity improves from-0.46%/℃to-0.42%/℃.Two types of grain boundary phases(PrNd-rich and PrNd-Ga-rich)are generated at grain boundaries by microstructural analysis,resulting in the decrease of Fe element concentration from more than 60%to about 10%at grain boundaries.The decrease of ferromagnetic element concentration at grain boundaries and the refinement of grain are considered to be the main reasons for the improvement of coercivity and thermal stability.
文摘The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of good combination of strength and toughness: (2)good damping ca- pacity(Q^(-1)≥5.0×10^(-3))can be obtained in dual-phase alloys only when the volume fraction of tempered martensite was controlled properly.The effect of martensite on magnetomechanical damp- ing of the ferritic matrix was analysed.The damping capacity of dual-phase alloys was related to the volume fraction V_m of tempered martensite by Q_^(-1)=Q_^(-1) (1-V_m/1+BV_m)at small vibration strain amplitudes ε_A≤5.0×10^(-6).
